BRK-A


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents


us-gaap:StatementClassOfStock
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
us-gaap:StatementClassOfStock
us-gaap:EarningsPerShareBasic

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ProductOrService
us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostsAndExpenses
us-gaap:ProductOrService

us-gaap:GainLossOnInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet
us-gaap:ConsolidationItems
us-gaap:InterestExpense
us-gaap:ProductOrService

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NonoperatingIncomeExpense
us-gaap:ConsolidationItems
us-gaap:ProductOrService
us-gaap:OperatingExpenses
us-gaap:ConsolidationItems
us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:IncomeStatementLocation, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:IncomeStatementLocation, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:PremiumsEarnedNet
us-gaap:ProductOrService

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:Revenues
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:Assets
us-gaap:ConsolidatedEntities
us-gaap:ProductOrService
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:Liabilities
us-gaap:ConsolidatedEntities
us-gaap:ProductOrService
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ProductOrService

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:InventoryNet
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:ProductOrService, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:ProductOrService
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets
us-gaap:ProductOrService
us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:BusinessAcquisition
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:ProductOrService
us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:EquitySecuritiesFvNi
dei:LegalEntity
us-gaap:EquitySecuritiesByIndustry
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:OtherAssets
us-gaap:ProductOrService

us-gaap:DebtAndCapitalLeaseObligations
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:MinorityInterest

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:MinorityInterest

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DepreciationDepletionAndAmortization

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:ProductOrService
us-gaap:ProceedsFromIssuanceOfLongTermDebt
us-gaap:ProductOrService
us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:ProceedsFromRepaymentsOfShortTermDebt
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement
brka:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesDebt

brka:ChargeOffsNetOfRecoveriesOnReceivables
us-gaap:ProductOrService
brka:CostOfLeasing
us-gaap:ProductOrService
brka:CostsOfServicesAndOperatingExpenses
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
brka:DebtMaturingDuringPeriod
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
brka:EquityMethodInvestmentDistributionsFromOtherInvestees
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
brka:EquityMethodInvestmentGoodwillAndIntangibleAssetsImpairmentCharges
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
brka:EquityMethodInvestmentNonRecurringDistribution
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
brka:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossAttributableToCommonStockholders
us-gaap:FairValueByFairValueHierarchyLevel
brka:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInRegulatoryAssetsAndLiabilities

brka:FinancingReceivableChangeToRetainedEarningsWithAdoptionOfASC326

brka:GainLossOnInvestmentsAndGainLossOnDerivativeInstrumentsNetOfTax

brka:IncreaseDecreaseInDeferredChargesReinsuranceAssumed

brka:IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests
us-gaap:StatementEquityComponents
us-gaap:ProductOrService
brka:InsuranceUnderwritingExpenses
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
brka:InvestmentIncomeInterestDividendAndOther
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities, us-gaap:Ownership, us-gaap:OtherCommitments
brka:LimitedLiabilityCompanyLLCMembersOrLimitedPartnersOwnershipInterestAcquired

brka:OtherNonCashIncomeExpenseIncludingAssetImpairmentCharges
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement
brka:PaymentsToAcquireBusinessesNetOfPostClosingAdjustments

brka:PaymentsToAcquireEquitySecurities

brka:PaymentsToAcquireUSTreasuryBillsAndAvailableForSaleSecuritiesDebt
us-gaap:ProductOrService
brka:PercentageOfIncreaseOrDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
us-gaap:ProductOrService
brka:PolicyholderBenefitsAndClaimsIncurredLifeAnnuityAndHealth

brka:ProceedsFromRedemptionsAndMaturitiesOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt

brka:ProceedsFromSaleOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt

brka:ProceedsFromSalesOfEquitySecurities

brka:ProvisionsForCreditLossesOnReceivables
us-gaap:ProductOrService
brka:ServiceRevenuesAndOtherIncome

brka:SharesIssuedAndRepurchased
us-gaap:StatementEquityComponents

brka:TaxableGainsLossOnSalesOfEquitySecurities
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:Depreciation
us-gaap:ProductOrService

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentDividendsOrDistributions

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:LongtermDebtType
us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:LongtermDebtType

us-gaap:GainLossOnDerivativeInstrumentsNetPretax
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:GainLossOnSaleOfOtherInvestments

us-gaap:GoodwillAcquiredDuringPeriod
us-gaap:ConsolidationItems
us-gaap:GoodwillAndIntangibleAssetImpairment
us-gaap:ProductOrService
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:GoodwillImpairmentLoss

us-gaap:GoodwillTranslationAndPurchaseAccountingAdjustments

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:ConsolidationItems
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:IncreaseDecreaseInIncomeTaxes

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInUnearnedPremiums
us-gaap:ProductOrService
us-gaap:InterestPaid
us-gaap:ProductOrService
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
us-gaap:ProductOrService
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
us-gaap:ProductOrService
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss
us-gaap:FairValueByAssetClass, us-gaap:ReinsurancePolicyType
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType
us-gaap:ProductOrService
us-gaap:ReinsurancePolicyType
us-gaap:CounterpartyName, us-gaap:Ownership
us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
us-gaap:CounterpartyName, us-gaap:Ownership
us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
us-gaap:CounterpartyName, us-gaap:Ownership, us-gaap:OtherCommitments

us-gaap:NonoperatingGainsLosses
us-gaap:ConsolidationItems

us-gaap:OperatingLeaseLeaseIncome
us-gaap:ProductOrService

us-gaap:OperatingLeaseLeaseIncomeLeasePayments

us-gaap:OperatingLeaseVariableLeaseIncome

us-gaap:OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeOtherNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
us-gaap:ProductOrService
us-gaap:OtherExpenses

us-gaap:OtherNoncashIncomeExpense
dei:LegalEntity, us-gaap:CounterpartyName, us-gaap:ReinsurancePolicyType
us-gaap:PaymentsForLossesAndLossAdjustmentExpense
us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType
us-gaap:ProductOrService

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:PaymentsToAcquireBusinessesGross
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement
us-gaap:ConsolidatedEntities, us-gaap:StatementScenario, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireLoansReceivable
us-gaap:Ownership, us-gaap:InvestmentType, us-gaap:OtherCommitments
us-gaap:PreferredStockDividendRatePercentage

us-gaap:ProceedsFromCollectionOfLoansReceivable

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForLoanLossesExpensed
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:RepaymentsOfDebt
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:RevenueNotFromContractWithCustomer
us-gaap:StatementBusinessSegments
us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType
us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:LiabilityForCatastropheClaimsByCatastrophicEvent
us-gaap:FairValueByAssetClass, us-gaap:ReinsurancePolicyType
us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType
us-gaap:ProductOrService
us-gaap:ReinsurancePolicyType

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents
us-gaap:ProductOrService
brka:AccountsAndOtherReceivablesNet
us-gaap:ProductOrService
brka:AircraftRepurchaseLiabilitiesAndDeferredRevenueLeasesNet
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
brka:AmountOfDifferenceBetweenCarryingValueAndFairValueBasedOnMarketPrice
us-gaap:ConsolidationItems
brka:AssetsExcludingGoodwill
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:BusinessAcquisition
brka:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesNotesPayableAndOtherBorrowings

brka:CurrentIncomeTaxesPayableReceivableNet

brka:DeferredTaxLiabilitiesDeferredChargesReinsuranceAssumed

brka:DeferredTaxLiabilitiesPropertyPlantAndEquipmentEquipmentHeldForLease

brka:DeferredTaxLiabilitiesUnrealizedGainsLossesOnAvailableForSaleSecuritiesAndOtherComprehensiveIncome
us-gaap:RetirementPlanType
brka:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
brka:DerivativeInstrumentPremiumsReceivedAtInceptionDates
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
brka:DifferenceBetweenCarryingValueAndFairValuePercentageBasedOnQuotedMarketPrice
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
brka:EquityDerivativeIntrinsicValue

brka:EquitySecuritiesAccumulatedUnrealizedGainLoss
us-gaap:EquitySecuritiesByIndustry

brka:EstimatedCostToAcquireEquityOwnershipInterestsInLessThanWhollyOwnedSubsidiaries
dei:LegalEntity, us-gaap:ConsolidatedEntities
brka:GuaranteesOfSubsidiaryDebt
us-gaap:ConsolidatedEntities

brka:IncomeTaxesPrincipallyDeferred
us-gaap:ConsolidatedEntities

brka:InventoryWorkInProcessAndOtherInventoryNetOfReserves

brka:LiabilityForUnpaidClaimsAndClaimAdjustmentExpenseRetroactiveReinsuranceContracts
dei:LegalEntity, us-gaap:CounterpartyName, us-gaap:ReinsurancePolicyType
us-gaap:CounterpartyName, us-gaap:ReinsurancePolicyType
us-gaap:ProductOrService

brka:OtherInventoryPurchasedGoodsNetOfReserves
us-gaap:ProductOrService
brka:PayableForPurchaseOfShortTermInvestmentsInUSTreasuryBills
us-gaap:ProductOrService
brka:PayableForPurchasesOfUSTreasuryBills
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
brka:PercentOfLoanBalancesWithPaymentStatusCurrent
us-gaap:ExternalCreditRatingByGrouping, us-gaap:InvestmentType
brka:PercentageOfAvailableForSaleSecuritiesDebtSecuritiesByCreditRating

brka:RepaymentsOfDebtPrincipalInNextTwelveMonths
us-gaap:ConsolidatedEntities
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
brka:USTreasuryBills
us-gaap:ProductOrService

brka:UnamortizedDeferredChargesOnReinsuranceAssumed
dei:LegalEntity, us-gaap:CounterpartyName, us-gaap:ReinsurancePolicyType
us-gaap:CounterpartyName, us-gaap:ReinsurancePolicyType
us-gaap:ProductOrService
us-gaap:StatementClassOfStock
dei:EntityCommonStockSharesOutstanding
us-gaap:ConsolidatedEntities
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:AccountsReceivableGross
us-gaap:ProductOrService
us-gaap:AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables

us-gaap:AssetsHeldByInsuranceRegulators

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:TypeOfArrangement
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationAssetsAndLiabilitiesArisingFromContingenciesAmountRecognized
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest
us-gaap:InvestmentType
us-gaap:CashEquivalentsAtCarryingValue
us-gaap:Ownership, us-gaap:InvestmentType, us-gaap:OtherCommitments, us-gaap:SubsequentEventType
us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
us-gaap:ProductOrService, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtInstrumentFairValue
us-gaap:ProductOrService, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService
us-gaap:DebtWeightedAverageInterestRate
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:DebtInstrument
us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DeferredIncomeTaxLiabilities
us-gaap:BalanceSheetLocation
us-gaap:DeferredPolicyAcquisitionCosts

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsRegulatoryAssetsAndLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOther
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanFundingStatus, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeAssets
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:ValuationTechnique
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:ValuationTechnique
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService, us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
us-gaap:DerivativeLiabilityMeasurementInput
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeLiabilityNotionalAmount

us-gaap:EquityMethodInvestmentOwnershipPercentage
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ConsolidatedEntities
us-gaap:EquityMethodInvestments
us-gaap:ProductOrService
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentsFairValueDisclosure
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EquitySecuritiesFvNiCost
us-gaap:EquitySecuritiesByIndustry
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType
us-gaap:EquitySecuritiesFvNiMeasurementInput
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

us-gaap:ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs

us-gaap:FinancingReceivableAllowanceForCreditLosses

us-gaap:FinancingReceivableBeforeAllowanceForCreditLossAndFee
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus

us-gaap:FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount
brka:FiniteLivedAndAndIndefiniteLivedIntangibleAssetsByMajorClass, us-gaap:ProductOrService
us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:GuaranteeObligationsByNature
us-gaap:GuaranteeObligationsMaximumExposure
brka:FiniteLivedAndAndIndefiniteLivedIntangibleAssetsByMajorClass, us-gaap:ProductOrService
us-gaap:IntangibleAssetsGrossExcludingGoodwill
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsInAndAdvancesToAffiliatesAmountOfEquity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceived

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears
us-gaap:ProductOrService
us-gaap:LiabilityForAsbestosAndEnvironmentalClaimsNet
us-gaap:ReinsurancePolicyType

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability
us-gaap:ProductOrService
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:LiabilityForFuturePolicyBenefits
us-gaap:Range
us-gaap:LiabilityForFuturePolicyBenefitsInterestRate

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument
us-gaap:CounterpartyName, us-gaap:CreditFacility
us-gaap:LoansAndLeasesReceivableGrossCarryingAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LoansReceivableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
us-gaap:ConsolidatedEntities
us-gaap:ProductOrService

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
us-gaap:ConsolidatedEntities
us-gaap:ProductOrService

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
us-gaap:ConsolidatedEntities
us-gaap:ProductOrService

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:ConsolidatedEntities
us-gaap:ProductOrService

us-gaap:NotesReceivableNet
us-gaap:ProductOrService

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:ProductOrService
us-gaap:OtherReceivables
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent

us-gaap:PercentageOfLIFOInventory
us-gaap:ProductOrService
us-gaap:PolicyholderFunds
us-gaap:ProductOrService
us-gaap:PremiumsAndOtherReceivablesNet
us-gaap:ProductOrService
us-gaap:PremiumsReceivableGross

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseNet
us-gaap:ProductOrService

us-gaap:PurchaseObligationDueAfterFifthYear

us-gaap:PurchaseObligationDueInFifthYear

us-gaap:PurchaseObligationDueInFourthYear

us-gaap:PurchaseObligationDueInNextTwelveMonths

us-gaap:PurchaseObligationDueInSecondYear

us-gaap:PurchaseObligationDueInThirdYear
us-gaap:ProductOrService
us-gaap:RegulatoryAssets
us-gaap:ProductOrService
us-gaap:RegulatoryLiabilities
us-gaap:ProductOrService
us-gaap:ReinsuranceRecoverablesGross

us-gaap:ReinsuranceRecoverablesOnUnpaidLossesGross
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:StatementBusinessSegments

us-gaap:RestrictedCashAndCashEquivalents
us-gaap:ProductOrService
us-gaap:RevenueRemainingPerformanceObligation
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:ShortTermBorrowings
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:ShortTermDebtWeightedAverageInterestRate
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearEight
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFive
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFour
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearNine
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearOne
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSeven
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSix
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTen
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearThree
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTwo
us-gaap:ProductOrService, us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet
us-gaap:ProductOrService, us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNet
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNetNotSeparatelyPresented
us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimAdjustmentExpenseOtherReconcilingItem
us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAccumulatedUnallocatedClaimAdjustmentExpense
us-gaap:ProductOrService, us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsNumberOfReportedClaims
dei:LegalEntity
us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
dei:LegalEntity
us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
us-gaap:ProductOrService
us-gaap:UnearnedPremiums

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:UnsecuredDebt

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Balance Sheet
Operating Lease Liability
Assets
Operating Lease Right Of Use Asset
Current Assets
Inventory Net
NonCurrent Assets
Operating Lease Right Of Use Asset
Liabilities
Operating Lease Liability
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Payments For Proceeds From Other Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
InventoryNet
Inventory Finished Goods Net Of Reserves

Tables

  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 us-gaap:WeightedAverageNumberOfSharesOutstandingBasic us-gaap:StatementClassOfStock brka:EquivalentClassA▁▅█1.5030131.5195761.533284NA1.5866981.611761.622889NA1.6330021.6349621.639821NA1.6435561.6450571.644958NA1.6446561.644581.644425NA1.643913NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:WeightedAverageNumberOfSharesOutstandingBasic us-gaap:StatementClassOfStock brka:EquivalentClassB▁▅█2254.5188382279.3633822299.925502NA2380.0463042417.6403112434.333367NA2449.502432452.4424012459.731886NA2465.3336622467.5858532467.436888NANA2466.870082466.636938NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock brka:EquivalentClassA▆▇▆█▇▇▁▇▆▆▇▃▆▆▅█▅▅▅▅▆▅▅6882.018488.07638.023015.018994.016314.0-30653.017909.010119.08608.013209.0-15467.011280.07301.0-692.019790.02473.02592.02469.03823.04379.03042.03401.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock brka:EquivalentClassB▆▇▆██▇▁▇▆▆▇▃▇▆▅█▅▅▅4.5912.335.0915.01000000000000212.6610.88-20.4411.9199999999999986.755.748.81-10.297.524.87-0.4613.21.651.731.65NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 COGS Ratio us-gaap:ProductOrService brka:InsuranceAndOther▇▇▆▆▆▄▆▇▆▆▅█▅▅▄▄▄▄▆▄▃▃▃▂▄▂▁57809.057251.053297.053110.051649.047609.051378.054835.053270.052777.050281.059713.049201.048939.046311.046560.047181.045709.053456.045074.043911.043598.042640.040063.047421.039651.035880.0NANANANANANANANANANANANANANANANANANANANANANANANA
 Cost Ratio us-gaap:ProductOrService brka:InsuranceAndOther▇▇▆▆▆▄▆▇▆▆▅█▅▅▄▄▄▄▆▄▃▃▃▂▄▂▁57809.057251.053297.053110.051649.047609.051378.054835.053270.052777.050281.059713.049201.048939.046311.046560.047181.045709.053456.045074.043911.043598.042640.040063.047421.039651.035880.0NANANANANANANANANANANANANANANANANANANANANANANANA
 Cost Ratio us-gaap:ProductOrService brka:RailroadUtilitiesAndEnergy█▆▅▅▆▂▃▄▆▅▄▅▆▅▃▃▄▃▂▂▄▁▁▂▄▃▃12774.011863.011302.011271.011375.09231.09887.010533.011702.010821.010397.010858.011818.010895.010102.010044.010652.09843.09404.09516.010330.08851.08845.09550.010697.09866.09891.0NANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems us-gaap:OperatingSegments██▇▇▆▅▆▇▇▆▆▆▆▆▅▅▆▅▇▅▅▄▄▃▄▄▃▃▄▃▂▂▂▂▂▂▁▁70656.069200.064656.064440.063027.056759.061132.065272.064732.063459.060534.063496.063412.062184.058495.059222.059612.057426.064483.055734.055418.053543.051130.050514.051625.051560.047144.048117.051240.047326.044008.045257.044466.043847.042188.042218.040202.039408.0NANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,brka:BerkshireHathawayEnergyCompany█▆▆▆▇▄▄▄▆▄▄▄▆▅▄▄▅▄▃▃▅▃▃▃▅▄▃▃▄▃▃▁▂▁▁7013.06085.05924.05639.06226.04659.04507.04752.05720.04970.04672.04719.05706.05050.04512.04689.05370.04623.04257.04244.05198.04299.04118.04213.05144.04543.04331.04270.04853.04185.04306.03179.03392.03056.03116.0NANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,brka:BerkshireHathawayInsuranceGroup▆▆▅▅▅▅▅▆▅▅▄▅▄▄▄▃▄▃█▃▂▂▂▂▂▂▁▁▃▂▁▁▁▁▁▁▁▁19066.018622.017838.017619.017136.017210.017396.018258.017112.016517.015806.017023.015779.015548.014586.014375.014597.013651.022885.013688.012407.012035.012273.011928.011560.011738.010630.010758.013674.010824.010367.010329.010354.010358.010378.010239.09832.09827.0NANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,brka:BurlingtonNorthernSantaFeCorporation▆▆▅▆▄▁▅▆▇▇▆██▇▅▆▄▄▄▄▄▁▂▅▅▄▅█▇▆▅▆▆▄▄▅▄▃5790.05809.05401.05674.05176.04602.05417.05839.06021.05893.05762.06206.06147.05878.05624.05638.05314.05250.05185.05310.05167.04585.04767.05396.05600.05369.05602.06176.05881.05735.05447.05757.05651.05322.05284.05428.05343.05062.0NANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,brka:ManufacturingBusinesses▆▆▅▅▅▄▅▅▅▅▅█▄▄▃▃▃▃▃▃▃▃▂▁▂▂▁▁▂▂▁▁▁▁▁17496.017412.015913.015841.015170.013033.015035.015557.015897.016206.015070.021544.013552.013853.012934.012791.012819.012738.012097.011669.012082.012201.010554.08568.09181.09524.08863.08985.09534.09613.08641.08397.08804.08896.08161.0NANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,brka:McLaneCompany▇▆▅▆▆▅▆█▇▇▆▇▇▇▆▆▇▇▆▆▆▆▆▆▆▆▅▆▆▅▃▆▅▅▄▄▂▁12612.012295.011622.011761.012040.011218.011821.013244.012604.012411.012199.012549.012822.012427.012189.012295.012798.012581.012101.011954.012271.012049.011801.012023.012264.012293.011643.012313.012151.011722.010454.012223.011547.011375.010785.010826.09534.09004.0NANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,brka:ServiceAndRetailingBusinesses██▇▇▆▄▅▆▆▆▆▇▆▆▅▆▅▅▄▅▅▅▄▅▄▅▂▂▁▁▁8679.08977.07958.07906.07279.06037.06956.07622.07378.07462.07025.08316.06974.07062.06587.07143.06527.06550.06093.06871.06331.06385.05891.06500.06151.06294.04521.03820.03493.03605.03358.0NANANANANANANANANANANANANANANANANANANANA
 SG&A Ratio us-gaap:ProductOrService brka:InsuranceAndOther▇▇▆▆▆▄▆▇▆▆▅█▅▅▄▄▄▄▆▄▃▃▃▂▄▂▁57809.057251.053297.053110.051649.047609.051378.054835.053270.052777.050281.059713.049201.048939.046311.046560.047181.045709.053456.045074.043911.043598.042640.040063.047421.039651.035880.0NANANANANANANANANANANANANANANANANANANANANANANANA
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▆▇▆█▇▇▁▇▆▆▇▃▆▆▅█▅▅▆▆▅▅▅▅▅▅▅▅▅▅▅▆▅▅▆▅▅▅▆▅▅▅▅▆▅▅▅9729.028581.011384.036782.030914.027049.0-51224.029324.015794.014122.021949.0-26480.018421.010680.0-811.040939.07598.07844.09832.013786.06219.04324.03061.07257.02214.04566.01296.02701.03382.06767.05729.014127.06385.05126.010384.05001.07189.01372.011108.04921.0-3047.02679.02696.08236.06863.0-4489.05146.0NANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest █▇▇██▇▆▇▇▇▇▆▇▆▇▇▇▇▇▆▇▇▇▇▆▇▆▆▇▇▇▇▇▇▇▇▇▇▇▇▆▇▆▁▇▆▅288.0202.0136.0328.0302.0125.0-4.0104.0112.096.093.0-22.0162.034.075.0119.0203.0130.0103.024.0132.061.074.058.047.0131.039.00.092.068.096.098.0131.064.0101.0108.0172.082.0141.0146.02.0138.0-99.0-950.0170.045.0-199.0NANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▆▇▆█▇▇▁▇▆▆▇▃▆▆▅█▅▅▆▆▅▅▅▅▅▅▅▅▅▅▅▆▅▅▆▅▅▅▆10017.028783.011520.037110.031216.027174.0-51228.029428.015906.014218.022042.0-26502.018583.010714.0-736.041058.07801.07974.09935.013810.06351.04385.03135.07315.02261.04697.01335.02701.03474.06835.05825.014225.06516.05190.010485.05109.07361.01454.011249.0NANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService brka:InsuranceAndOther██▆▆▆▃▅▇▆▆▅▇▆▆▅▆▅▅▄▄▄▄▃▂▃▃▁28984.028761.026530.026526.025957.023216.025392.027277.026950.027047.025767.027399.026789.026480.025415.026154.025815.025419.024360.024137.024472.024349.022796.021884.022297.022589.020259.0NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ██▇▇▇█▆▇▇▇▆▇▆▆▆▆▆▆▇▅▅▅▅▄▄▅▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁63397.060934.056022.058725.056966.061259.054339.060118.056053.056011.053521.057716.055325.053791.052382.054654.055147.051698.059738.049282.048543.047088.045947.044439.044917.045522.040997.042418.044449.040846.038855.039817.039163.037802.036572.037966.035114.033931.033216.033503.030376.033009.031486.029684.031740.028771.026939.0NANANANA
us-gaap:GainLossOnInvestments ▆▇▆███▁▇▆▆▇▃▆▆▅▅▆▅▅▆▆▅▆▅▆▅▅▅▅▆▆▆▆▅▅▅▆▅▅▅▅▆▅▅▅▅▆4851.027173.05211.038873.031625.039289.0-68882.031044.010692.09835.019552.0-34905.014569.05990.0-7809.0148.0657.0290.0315.01910.03150.0643.01850.0648.08266.0362.097.0454.0-376.02366.01131.01354.01714.0492.0505.0526.0917.0125.0-106.0300.092.01289.0-407.0-74.0458.0383.01318.0NANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▆▇▆██▇▁▇▆▆▇▃▇▆▅▅▅▅▅▆▆▆▅▆▆▅▆▅▆▆▅12484.035721.014528.045403.037930.035409.0-63049.036801.020489.017759.027647.0-32721.023147.015098.0-1523.06391.05630.06129.05688.09314.010525.07372.06456.07381.014072.05846.07647.05841.06750.08916.06598.0NANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▆▇▆██▇▁▇▆▆▇▃▇▆▅▅▅▅▅▆▆▆▅12107.035574.014277.045010.037640.035666.0-63349.036561.019845.017635.027479.0-29510.022831.014771.0-1924.04253.05378.05820.05449.09062.010300.07166.06216.0NANANANA5867.06750.08916.06598.07232.07378.06891.07295.06754.05936.04615.04931.04452.03363.05265.02234.06481.04534.02938.05098.0NANANANA
us-gaap:IncomeTaxExpenseBenefit ▇█▇███▄█▇▇▇▅▇▇▆▁▆▇▆▇▇▇▆▇▇▇▇▆▇▇▇▇▇▇▇▇▇▆▆▆▆▇▆▇▆▆▆1840.07296.02688.09273.07517.09002.0-13352.07571.03832.03586.05915.0-7330.04440.03021.0-452.0-26265.01427.01774.01549.02959.03192.02290.0799.01834.04545.01739.02414.01623.02029.02458.01825.02169.02225.02279.02278.02093.01882.01384.01565.01261.0953.01725.0629.02008.01415.0848.01336.0NANANANA
us-gaap:IncomeTaxesPaidNet ▄▆▂▆▅▂▂▃█▃▂▂▅▆▂▄▂▃▁▆▄▃▁▅▄▃▁▃▃▅▂▄▄▆▁▅▄▄▁▄▂▂▁▂▃▅▂1494.02252.0256.02286.01735.0385.0595.01020.03196.0735.0464.0377.01619.02069.0289.01512.0692.01056.026.02482.01182.0824.0231.01960.01447.0880.0248.0813.01050.01868.0283.01373.01304.02483.0241.01799.01518.01179.0199.01533.0550.0571.0231.0517.0711.02009.0310.0NANANANA
 us-gaap:InterestExpense us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems▄▄▄▄▄▄▄▄▄▄▄▆▄▁▆▅▆█▅▁▅▃▆128.0144.0114.0120.0116.0111.0136.0104.096.0107.0109.0381.060.0-320.0337.0251.0386.0646.0211.0-288.0201.0-31.0348.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestExpense us-gaap:ProductOrService brka:InsuranceAndOther▅▅▅▅▅▅▅▅▅▅▅▅▅▅▆▅▆█▅▁▅▃▆▃▃▄▄286.0298.0276.0288.0263.0258.0296.0266.0261.0267.0262.0263.0252.0255.0390.0335.0435.0700.0270.0-229.0259.028.0387.011.088.0217.0144.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestExpense us-gaap:ProductOrService brka:RailroadUtilitiesAndEnergy▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂█▂▂▂▂▂▁▂▂▂▂▁770.0778.0774.0769.0737.0744.0728.0727.0724.0725.0729.0708.0698.0702.0710.01164.0700.0697.0693.0680.0681.0596.0685.0696.0672.0653.0632.0NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▆▇▆██▇▁▇▆▆▇▃▇▆▅█▅▅▅▆▆▅▆▆▆▅▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅10344.028094.011711.035835.030137.026295.0-49746.029159.016524.014073.021661.0-25392.018540.012011.0-1138.032551.04067.04262.04060.06286.07198.05001.05589.05478.09428.04013.05164.04155.04617.06395.04705.04990.05053.04541.04892.04551.03920.03108.03245.03048.02278.03417.01511.04377.02989.01968.03633.03056.03238.03295.0-1534.0
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▇█▄▇▇▃▂▂▄▃▂▁▅▂▂▃▄▃▃▂▄▃▂▂▃▃▂▂▃▂▂▃▃▂▄▃▄▄▄▄▄▄▃▃▄▄▅300.0331.0129.0295.0276.0112.049.071.0133.0100.071.01.0167.066.067.0105.0136.093.079.069.0135.081.068.069.099.094.069.063.0104.063.068.073.0100.071.0125.0110.0134.0123.0121.0143.0132.0123.094.096.0130.0122.0179.0NANANANA
us-gaap:NonoperatingIncomeExpense NANANA39354.031582.040085.0-70275.031311.010926.010048.020322.0-35508.014706.06362.0-8015.0163.0965.0225.0775.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NonoperatingIncomeExpense us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItemsNANANA39354.031582.040085.0-70275.031311.010926.010048.020322.0-35508.014706.06362.0-8015.0163.0965.0225.0775.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:ProductOrService us-gaap:CargoAndFreight▄▅▄▄▃▁▅▆▆▆▇█▇▇▆3527.03588.03510.03495.03161.02871.03593.03730.03839.03885.03982.04207.04012.03974.03852.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems brka:CorporateReconcilingItemsAndEliminations▆▄█▁▁▄▇▃█▅▆█▅▄▄▁▄▄▄▃▃▄▄▄▃▄46.0-299.0494.0-811.0-759.0-218.0216.0-453.0477.0-108.0163.0483.0-127.0-212.0-219.0-777.0-278.0-296.0-259.0-478.0-477.0-213.0-213.0-259.0-354.0-212.0NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems us-gaap:OperatingSegments▆█▇▅▅▅▅▃█▇▅▃▇▇▅▂▂▅▂▄▆▄▃▄▅▄▄▃▅▅▂▃▃▄▃▁▃▃7268.08623.08197.06599.06958.06544.06846.05807.08538.07802.07103.05896.08312.08301.06647.05118.05077.06537.05144.06259.07370.06505.05737.05980.06909.06059.06266.05794.06896.06555.05291.05634.05531.06213.05885.04446.05442.05853.0NANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems,us-gaap:IncomeStatementLocation,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,us-gaap:InvestmentIncome,brka:BerkshireHathawayInsuranceGroup▄▅▅▅▃▆▇▇█▇▅▅▅▄▃▃▃▃▂▁▁▃▂▂▁▄▂1337.01456.01412.01469.01220.01613.01647.01684.01782.01649.01485.01451.01455.01392.01205.01244.01246.01283.01129.01076.01029.01235.01142.01084.01045.01334.01087.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,brka:BerkshireHathawayEnergyCompany█▅▄▃▇▄▃▃▆▄▄▂▇▄▃▁▇▄▄▃▇▄▄▃▇▄▄▃▆▄▄▂▄▃▄1375.0739.0683.0405.01122.0533.0419.0424.01061.0593.0540.0234.01165.0586.0487.037.01262.0670.0615.0492.01246.0666.0569.0453.01153.0649.0596.0463.01051.0578.0619.0232.0586.0435.0553.0NANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,brka:BerkshireHathawayInsuranceGroup▃▇▇▅▅█▇▄▇▇▇▅▇█▆▄▁▅▄▇▆▆▆▆▆▅▆▅▇▇▆▆▅▇▇▅▆▇317.01921.02378.01083.0929.02666.02109.0577.02363.02105.01972.01140.02054.02596.01723.0617.0-963.01259.0750.01940.01438.01745.01490.01579.01688.01286.01834.01303.01926.02135.01661.01715.01341.02361.02385.01008.01584.02350.0NANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,brka:BurlingtonNorthernSantaFeCorporation██▅▇▆▄▄▇▇▆▅▆▇▅▄▆▅▄▂▄▅▂▂▆▆▄▅▇▅▃▁▅▄▃▂▃▄▂2029.01979.01659.01937.01777.01494.01584.01871.01941.01773.01665.01816.01879.01655.01513.01736.01710.01537.01345.01564.01633.01238.01258.01728.01839.01536.01672.01874.01654.01472.01169.01686.01556.01397.01289.01474.01508.01280.0NANANANANANANANANANANANANA
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us-gaap:OtherComprehensiveIncomeLossNetOfTax ▄▄▄▅▄▄▃▄▄▄▄▄▄▄▄█▆▆▇▇▄▄▃▅▁▄▂▃▄▄▅█▅▄▆▄▆▃▇-627.0358.0-320.0980.0803.0767.0-1531.0198.0-751.045.0310.0-1111.0-124.0-1363.0335.08402.03598.03619.05796.07455.0-982.0-697.0-2522.01768.0-7266.0590.0-3898.0-1517.0-1247.0377.01052.09162.01363.0578.05468.0448.03307.0-1777.07883.0NANANANANANANANANANANANA
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us-gaap:ProfitLoss ▆▇▆██▇▁▇▆▆▇▃▇▆▅█▅▅▅▆▆▅▆▆▆▅▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅10644.028425.011840.036130.030413.026407.0-49697.029230.016657.014173.021732.0-25391.018707.012077.0-1071.032656.04203.04355.04139.06355.07333.05082.05657.05547.09527.04107.05233.04218.04721.06458.04773.05063.05153.04612.05017.04661.04054.03231.03366.03191.02410.03540.01605.04473.03119.02090.03812.0NANANANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▅▅▅█▄▃▄█▅▅▄█▅▅▄▇▇▇█▇▇▆▆▆▇▆▅▅▆▅▅▅▅▅▄▅▄▄▄▃▃▄▃▃▃▂▃▂▂▂▁49014.048110.044623.064381.043494.037378.041452.065368.045169.044460.042392.063714.045427.044255.041509.058907.060525.057518.065187.058344.059068.054460.052403.051820.058989.051368.048644.048259.051199.049762.045453.047049.046541.044693.043867.044720.041050.038546.038147.037955.033739.038274.033720.036165.036274.031709.032037.030198.029904.029607.022784.0
us-gaap:Revenues ██▇▇▇▆▇▇▇▇▇▇▇▇▆▆▇▆▇▆▆▆▅▅▆▅▅▅▅▅▄▅▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▁70583.069114.064599.064381.063024.056840.061265.065368.064972.063598.060678.063714.063450.062200.058473.058907.060525.057518.065187.058344.059068.054460.052403.051820.058989.051368.048644.048259.051199.049762.045453.047049.046541.044693.043867.044720.041050.038546.038147.037955.033739.038274.033720.036165.036274.031709.032037.030198.029904.029607.022784.0
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  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets ███▇▇▆▆▇▆▆▆▅▆▅▅▅▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁920758.0912493.0884393.0873729.0829946.0788133.0760448.0817729.0788482.0760108.0738724.0707794.0736459.0711932.0702651.0702095.0681554.0665590.0654451.0620854.0604038.0592816.0586315.0552257.0545468.0540774.0531076.0526186.0517363.0504379.0494944.0484931.0458081.0446563.0442302.0427452.0424115.0411356.0411362.0392647.0385494.0382696.0376496.0372229.0NANANA297119.0NANANA
us-gaap:Liabilities ███▇▇▇▆▆▆▆▆▅▅▅▅▅▆▆▆▅▅▅▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁439683.0433693.0428217.0422393.0410731.0390880.0385213.0389166.0386924.0373717.0366133.0355294.0357040.0350174.0351599.0350141.0369702.0361497.0358171.0334495.0331423.0326558.0324478.0293630.0294147.0291572.0286237.0283159.0277061.0267619.0264655.0260446.0246650.0241575.0240196.0235864.0235041.0229641.0231093.0223686.0221613.0215912.0212231.0209295.0NANANA161334.0NANANA
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  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
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  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
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 us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService,us-gaap:PropertyPlantAndEquipmentByType brka:Railroad,brka:LocomotivesFreightCarsAndOtherEquipment█▇▇▇▇▇▇▇▇▇▆▆▅▅▅▄▄▄▃▃▃▂▂▁13784.013601.013596.013523.013477.013516.013382.013482.013381.013264.013185.013016.012731.012640.012600.012543.012459.012264.012172.012075.011860.011758.011515.011320.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService,us-gaap:PropertyPlantAndEquipmentByType brka:Railroad,us-gaap:ConstructionInProgress▇▆▅▅▇▇▄▃▄▃▁▂▅▇▆▆▅▅▄▆▇█▇▇1030.0981.0855.0916.01075.01076.0773.0748.0788.0723.0574.0664.0910.01039.0943.0989.0927.0896.0810.0965.01064.01131.01031.01031.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService,us-gaap:PropertyPlantAndEquipmentByType brka:UtilitiesAndEnergy,brka:UtilityGenerationTransmissionAndDistributionSystems███▇▆▅▅▅▄▄▄▄▃▃▃▃▂▂▂▂▁▁▁▁89026.088748.087898.086730.082743.081518.080530.081127.078596.078087.077659.077288.075751.074975.075068.074660.073138.072317.071308.071536.070316.069955.069880.069248.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService,us-gaap:PropertyPlantAndEquipmentByType brka:UtilitiesAndEnergy,us-gaap:ConstructionInProgress▆▅▄▄█▆▅▅█▆▄▃▅▃▂▂▄▂▂▁▃▂▂▂4343.03887.03309.03308.05132.04499.03819.03732.05313.04331.03388.03110.03724.03204.02735.02556.03503.02607.02350.02098.03175.02701.02757.02627.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService,us-gaap:PropertyPlantAndEquipmentByType brka:UtilitiesAndEnergy,us-gaap:OtherEnergyEquipment████▄▄▄▄▄▄▄▄▃▃▃▃▂▂▂▂▁▁▁▁13009.012969.012828.012671.08952.08850.08792.08817.08572.08587.08318.08324.08156.08142.07622.07499.07176.07044.06937.06596.06056.05882.05665.05626.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService,us-gaap:PropertyPlantAndEquipmentByType brka:UtilitiesAndEnergy,us-gaap:Pipelines████▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁17044.016772.016712.016667.08281.08215.08181.08165.07637.07571.07547.07524.07295.07240.07230.07176.06991.06969.06944.06942.06866.06835.06798.06755.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:ProductOrService brka:InsuranceAndOther██▇▇▇▆▆▆▆▅▅▅▆▅▅▃▃▃▃▂▂▂▁▁23643.023251.022877.022617.021868.021349.020900.020772.020330.020012.019583.019199.020515.020009.019664.017320.017025.016576.016146.015686.015639.014958.014499.014077.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:ProductOrService brka:Railroad██▇▇▇▆▆▆▆▆▅▅▄▄▄▄▃▃▃▂▂▁▁▁14641.014138.013687.013175.012724.012401.012198.012101.011512.011206.010865.010004.09596.09259.08954.08627.08293.07936.07583.06130.05673.05370.05135.04845.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:ProductOrService brka:UtilitiesAndEnergy██▇▇▅▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▁▁▁▁35361.034754.033990.033248.029856.029257.028658.028536.028794.028637.027964.027651.027339.026852.026601.026020.025829.025251.024651.024663.024305.023924.023948.023487.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AmortizationOfIntangibleAssets ▃▄▄▄▄▄▄▅▄▄▅▅▅▆▆▆▆▇▆█▆▇▅▂▃▂▁▃▃▂▂▃305.0318.0319.0315.0315.0322.0325.0331.0328.0325.0333.0341.0345.0355.0352.0361.0368.0373.0367.0405.0369.0377.0339.0269.0300.0282.0255.0301.0289.0285.0280.0293.0NANANA248.0258.0248.0254.0NA191.0191.0183.0NANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:ProductOrService brka:InsuranceAndOther▅▅▅▅▅▅▆▆▆▅▅▅███▅▄▄▄▄▄▄▄▁20722.020865.020990.021200.021141.021122.021258.021438.021230.021204.020825.020628.024357.023948.023807.020104.019946.019790.019645.019325.019326.019072.018958.015540.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:ProductOrService brka:Railroad██████▇▇▆▆▅▅▅▅▄▄▄▄▃▃▃▂▁▁65340.065165.065042.065088.065146.064955.064600.064533.064002.063576.063222.063185.062800.062507.062331.062313.061967.061642.061389.061250.060897.060528.059900.059510.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:ProductOrService brka:RailroadUtilitiesAndEnergy████▅▅▅▅▄▄▄▃▃▃▃▃▂▂▂▂▂▁▁▁153401.0152787.0151799.0151216.0140398.0138780.0137264.0137838.0135326.0133515.0132170.0131780.0130387.0129216.0128385.0128184.0126946.0125328.0124277.0123759.0123005.0121977.0121052.0120279.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:ProductOrService brka:UtilitiesAndEnergy████▅▄▄▄▄▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁88061.087622.086757.086128.075252.073825.072664.073305.071324.069939.068948.068595.067587.066709.066054.065871.064979.063686.062888.062509.062108.061449.061152.060769.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Goodwill ▆▆▆▆▆▆█████████████▇▇▇▇▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁73770.073758.073695.073734.071865.071753.081659.081882.081228.081269.081220.081025.081327.081250.081337.081258.080882.080175.079951.079486.079392.079177.079114.062708.062692.062799.062879.060714.058669.058792.058264.057011.054735.054372.054407.054523.054143.053145.053166.053213.053310.049125.049080.049006.0NANANA33972.0NANANA
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill ▁▁▁▁▁▁██▆▇▇▇▇▇▇▇▆▆▅▅18300.018300.018300.018300.018300.018300.019000.019000.018800.018900.018900.018900.018900.018900.018900.018930.018800.018800.018700.018705.0NANANA2964.03140.03149.03188.02586.02604.0NANA2221.0NANANANA2273.02274.02267.02250.0NANANANANANANANANANANA
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:ProductOrService brka:InsuranceAndOther▆▆▆▆▆▇▇▇▇▇▇▇▇▇▇▇▇▇█████▁28643.028853.029184.029462.029652.029847.030693.031051.030788.031032.031266.031499.031626.031925.032260.032518.032974.033220.033472.033481.035034.035179.035267.09148.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset NANANA5579.0NANANA5941.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EquitySecuritiesFvNi ██▇▆▅▃▁▅▃▂▂▁▃▁310739.0307942.0282097.0281170.0245317.0207454.0180782.0248027.0220051.0200516.0191771.0172757.0207332.0179729.0NA170540.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:DebtAndCapitalLeaseObligations ███▁▁▁▁▁6900.06900.06900.06850.06850.06850.06850.06850.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:ConsolidatedEntities,us-gaap:ProductOrService srt:Subsidiaries,brka:InsuranceAndOther▁▁▂▂▂▂▆▆▆▇▇███4497.04568.04676.04682.04676.04680.05241.05262.05304.05435.05519.05597.05583.05604.0NA6725.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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us-gaap:MinorityInterest ████▃▂▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▂▁▃▃▃▃▃▃▃▂▃▅8595.08391.08189.08172.04060.03758.03670.03772.03949.03847.03714.03797.03813.03664.03651.03658.03574.03434.03429.03358.03351.03233.03176.03077.03038.03159.03381.02857.02846.02755.02677.02595.03049.02972.04035.03941.04472.04336.04272.04111.03924.03777.04210.05616.0NANANA4683.0NANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANANA1111.0NANANA1183.01363.01346.01312.01268.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANANA905.0NANANA950.01140.01123.01091.01048.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANANA725.0NANANA764.0915.0885.0859.0820.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANANA544.0NANANA620.0732.0708.0685.0658.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANANA1691.0NANANA1988.02423.02289.02183.02079.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity ██▇▇▇▆▆▇▆▆▆▅▆▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁472480.0470409.0447987.0443164.0415155.0393495.0371565.0424791.0397609.0382544.0368877.0348703.0375606.0358094.0347401.0348296.0308278.0300659.0292851.0283001.0269264.0263025.0258661.0255550.0248283.0246043.0241458.0240170.0237456.0234005.0227612.0221890.0208382.0202016.0198071.0187647.0184602.0177379.0175997.0164850.0159957.0163007.0160055.0157318.0NANANA131102.0NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ██▇▇▇▆▆▇▆▆▆▅▆▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁481075.0478800.0456176.0451336.0419215.0397253.0375235.0428563.0401558.0386391.0372591.0352500.0379419.0361758.0351052.0351954.0311852.0304093.0296280.0286359.0272615.0266258.0261837.0258627.0251321.0249202.0244839.0243027.0240302.0236760.0230289.0224485.0211431.0204988.0202106.0191588.0189074.0181715.0180269.0168961.0163881.0166784.0164265.0162934.0NANANA135785.0NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ▁▁▁▁▁▁▁▂▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▃▃▆▆██████▇▇35603.035635.035630.035626.035621.035615.035619.035658.035612.035610.035622.035707.035713.035694.035681.035694.035684.035663.035699.035681.035730.035710.035670.035620.035610.035584.035565.035573.035560.035491.035465.035472.036082.036101.037270.037230.037890.037856.037846.037807.037786.037771.037578.037533.0NANANA27074.0NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▇▆▆▅▆▆▆▅▅▅▅▅▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁494775.0484431.0456337.0444626.0408791.0378654.0352359.0402493.0373334.0356846.0342773.0321112.0346503.0327963.0315952.0255786.0224166.0220099.0215837.0211777.0205491.0198293.0193292.0187703.0182225.0172797.0168784.0163620.0159465.0154848.0148453.0143748.0138758.0133705.0129164.0124272.0119721.0115801.0112693.0109448.0106400.0104122.0100705.099194.0NANANA86227.0NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▇▇▆▆▅▅▅▅▅▆▆▆▆▇▇▆▅▅▅▅▅▄▄▄▃▄▄▄-4834.0-4219.0-4570.0-4243.0-5190.0-5967.0-6721.0-5243.0-5408.0-4678.0-4727.0-5015.0-3927.0-3808.0-2477.058571.050183.046652.043070.037298.029798.030777.031454.033982.032203.039417.038864.042732.044186.045421.045049.044025.034897.033565.032992.027500.027050.023781.025517.017654.015781.021106.021764.020583.0NANANA17793.0NANANA
us-gaap:TreasuryStockValue █▇▆▅▄▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁53072.045446.039418.032853.024075.014815.09700.08125.05937.05242.04799.03109.02691.01763.01763.01763.01763.01763.01763.01763.01763.01763.01763.01763.01763.01763.01763.01763.01763.01763.01363.01363.01363.01363.01363.01363.067.067.067.067.0NANANANANANANANANANANA
us-gaap:MinorityInterest ████▃▂▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▂▁▃▃▃▃▃▃▃▂▃▅8595.08391.08189.08172.04060.03758.03670.03772.03949.03847.03714.03797.03813.03664.03651.03658.03574.03434.03429.03358.03351.03233.03176.03077.03038.03159.03381.02857.02846.02755.02677.02595.03049.02972.04035.03941.04472.04336.04272.04111.03924.03777.04210.05616.0NANANA4683.0NANANA
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▄▃▃▃▄▃▁▄▃▂▁▃▃▂▁▂▃▂█12067.010253.09306.010546.011761.010668.06798.012077.09848.09185.07577.010845.010464.08535.07556.08277.010877.08327.018295.0NANANANANANANANANANANANANANANANANANANANANANA6481.03502.0NANA3547.03313.0NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities █▂▆▇▄▃▂▃▇▆▄▂▁▅█▃▆▄▂23514.0-22629.011196.016649.0-11855.0-14747.0-27804.0-21077.018364.07293.0-10201.0-21818.0-33461.0122.022308.0-19945.06851.0-5465.0-22532.0NANANANANANANANANANANANANANANANANANANANANANA332.02861.0NANA-1529.0-15371.0NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▃▁▂▁▅▆▆██▆▆▇▆▄▇▆▅█-7786.0-5229.0-8349.0-6668.0-8856.0-2474.0-346.0-1779.02098.02089.0-1678.0-286.0-10.0-1722.0-3794.0469.0-1398.0-2484.02015.0NANANANANANANANANANANANANANANANANANANANANANA-147.0-3559.0NANA387.07194.0NANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect █▂▆▇▃▃▁▃█▆▃▃▁▅▇▃▆▄▄27809.0-17656.012092.020959.0-9150.0-6509.0-21536.0-10659.030189.018578.0-4287.0-11290.0-23075.06802.026162.0-11139.016369.0500.0-2161.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:DepreciationDepletionAndAmortization ▇▇▇█▆▆▆▇▆▆▅▆▅▅▅▅▅▅▄▅▄▄▄▃▃▃▂▃▂▂▂▁▁▁▁2668.02672.02673.02904.02583.02524.02585.02657.02534.02456.02417.02610.02395.02387.02387.02353.02296.02296.02243.02296.02246.02234.02125.01978.01989.01941.01871.01934.01854.01810.01772.01675.01616.01616.01601.0NANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▄▃▃▃▄▃▁▄▃▂▁▃▃▂▁▂▃▂█12067.010253.09306.010546.011761.010668.06798.012077.09848.09185.07577.010845.010464.08535.07556.08277.010877.08327.018295.0NANANANANANANANANANANANANANANANANANANANANANA6481.03502.0NANA3547.03313.0NANANANA
us-gaap:NetIncomeLoss ▆▇▆██▇▁▇▆▆▇▃▇▆▅█▅▅▅▆▆▅▆▆▆▅▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅10344.028094.011711.035835.030137.026295.0-49746.029159.016524.014073.021661.0-25392.018540.012011.0-1138.032551.04067.04262.04060.06286.07198.05001.05589.05478.09428.04013.05164.04155.04617.06395.04705.04990.05053.04541.04892.04551.03920.03108.03245.03048.02278.03417.01511.04377.02989.01968.03633.03056.03238.03295.0-1534.0
us-gaap:ProfitLoss ▆▇▆██▇▁▇▆▆▇▃▇▆▅█▅▅▅▆▆▅▆▆▆▅▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅10644.028425.011840.036130.030413.026407.0-49697.029230.016657.014173.021732.0-25391.018707.012077.0-1071.032656.04203.04355.04139.06355.07333.05082.05657.05547.09527.04107.05233.04218.04721.06458.04773.05063.05153.04612.05017.04661.04054.03231.03366.03191.02410.03540.01605.04473.03119.02090.03812.0NANANANA
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities █▂▆▇▄▃▂▃▇▆▄▂▁▅█▃▆▄▂23514.0-22629.011196.016649.0-11855.0-14747.0-27804.0-21077.018364.07293.0-10201.0-21818.0-33461.0122.022308.0-19945.06851.0-5465.0-22532.0NANANANANANANANANANANANANANANANANANANANANANA332.02861.0NANA-1529.0-15371.0NANANANA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▅▅▃▅▅▅▄█▇▅▅▇▆▆▄▅▅▄▃▅▅▅▄▇█▅▅█▆▅▄▅▄▄▃▄▄▃▃▃▃▂▂▂▂▂▁3581.03144.02519.03496.03329.03219.02968.04840.04392.03596.03151.04497.03711.03740.02589.03297.03262.02794.02355.03525.03285.03301.02843.04279.04967.03389.03447.05013.04079.03299.02794.03360.02969.02551.02207.02582.02614.02419.02160.02518.02229.01962.01482.01689.01575.01546.01170.0NANANANA
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▃▁▂▁▅▆▆██▆▆▇▆▄▇▆▅█-7786.0-5229.0-8349.0-6668.0-8856.0-2474.0-346.0-1779.02098.02089.0-1678.0-286.0-10.0-1722.0-3794.0469.0-1398.0-2484.02015.0NANANANANANANANANANANANANANANANANANANANANANA-147.0-3559.0NANA387.07194.0NANANANA
 us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:ProductOrService brka:InsuranceAndOther▁▂▂▃▁▂▂▁▄▃▃▃▁▁▁▁▁▁▂▁▂▁█▁▁▁▄3.01507.01442.02490.07.01815.01613.03.03965.02180.01996.02354.027.011.017.021.026.092.01203.046.0785.061.08539.087.018.012.03241.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:ProductOrService brka:RailroadUtilitiesAndEnergy▄1475.0NANA2021.0170.01930.04324.01237.0824.0394.02945.00.02780.0626.03613.0201.0399.0319.02094.0843.023.0NANA1011.01230.01254.01984.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:ProductOrService brka:InsuranceAndOther▃▂▅▃▂▃▄▂▅▂▆█▃▂▄▂▃▂▃▁▃▃▂▂▂▂▄529.056.02425.0584.024.0590.01502.049.02139.096.02811.04734.0779.042.01840.093.0583.050.01130.0-657.0773.0767.0381.041.032.0121.01722.0NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:ProductOrService brka:RailroadUtilitiesAndEnergy▁█▄▆▁▃█▄▁▂▇▃▆▆▆▇▁▆▃▂▁▆▃▄▂▂▃63.01663.0883.01312.0158.0543.01748.0872.076.0259.01431.0555.01230.01207.01221.01605.0176.01322.0446.0244.098.01259.0522.0675.0202.0212.0636.0NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▇▆▆██▅▂▂▁▁▂▁7632.05980.06580.08994.08973.04998.01741.02043.0674.0548.01585.0418.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic us-gaap:StatementClassOfStock

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

brka:EquivalentClassA


Weighted
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value1.5030131.5195761.5332841.5866981.611761.6228891.6330021.6349621.6398211.6435561.6450571.6449581.6446561.644581.6444251.643913
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:EquivalentClassB


Weighted
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value22542279229923802417243424492452245924652467246724662466
Percentage of WeightedAverageNumberOfSharesOutstandingBasic150000.0150000.0150000.0150000.0150000.0150000.0150000.0150000.0150000.0150000.0150000.0150000.0150000.0150000.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock

us-gaap:EarningsPerShareBasic

brka:EquivalentClassA


Earnings
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6882.018488.07638.023015.018994.016314.0-30653.017909.010119.08608.013209.0-15467.011280.07301.0-692.019790.02473.02592.02469.03823.04379.03042.03401.0
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:EquivalentClassB


Earnings
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4.5912.335.0915.0112.6610.88-20.4411.926.755.748.81-10.297.524.87-0.4613.21.651.731.65
Percentage of EarningsPerShareBasic0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value97292858111384367823091427049-51224.029324157941412221949-26480.01842110680-811.0409397598784498321378662194324306172572214456612962701338267675729141276385512610384500171891372111084921-3047.02679269682366863-4489.05146
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.859.425.557.171.172.4-123.644.935.031.851.8-41.640.624.1-2.069.512.613.615.123.610.57.95.814.03.88.92.75.66.613.612.630.013.711.523.711.217.53.629.113.0-9.07.08.022.818.9-14.216.1

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value288202136328302125-4.01041129693-22.016234751192031301032413261745847131390.09268969813164101108172821411462.0138-99.0-950.017045-199.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.40.30.50.70.3-0.00.20.20.20.2-0.00.40.10.20.20.30.20.20.00.20.10.10.10.10.30.10.00.20.10.20.20.30.10.20.20.40.20.40.40.00.4-0.3-2.60.50.1-0.6

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value100172878311520371103121627174-51228.029428159061421822042-26502.01858310714-736.041058780179749935138106351438531357315226146971335270134746835582514225651651901048551097361145411249
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.459.825.857.671.872.7-123.645.035.232.052.0-41.640.924.2-1.869.712.913.915.223.710.88.16.014.13.89.12.75.66.813.712.830.214.011.623.911.417.93.829.5

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold

brka:InsuranceAndOther


Cost
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value289842876126530265262595723216253922727726950270472576727399267892648025415261542581525419243602413724472243492279621884222972258920259
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax59.159.859.541.259.762.161.341.759.760.860.843.059.059.861.244.442.744.237.441.441.444.743.542.237.844.041.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther78.978.378.70.079.480.979.50.079.279.379.50.080.679.679.70.080.580.180.60.080.179.780.60.081.381.381.2

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6339760934560225872556966612595433960118560535601153521577165532553791523825465455147516985973849282485434708845947444394491745522409974241844449408463885539817391633780236572379663511433931332163350330376330093148629684317402877126939
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax129.3126.7125.591.2131.0163.9131.192.0124.1126.0126.390.6121.8121.5126.292.891.189.991.684.582.286.587.785.876.188.684.387.986.882.185.584.684.184.683.484.985.588.087.188.390.086.293.482.187.590.784.1

us-gaap:CostsAndExpenses us-gaap:ProductOrService

brka:InsuranceAndOther


Costs
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value540215178547056497754848654049464475185647347475464531554199446214331242683443824577242527508784036939645387323768135786359773663232274
Percentage of CostsAndExpenses85.285.084.084.885.188.285.586.384.584.984.793.980.780.581.581.283.082.385.281.981.782.382.080.580.180.578.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax110.2107.6105.577.3111.5144.6112.179.3104.8106.9106.985.198.297.9102.875.375.673.978.069.267.171.171.969.161.071.366.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther147.1140.9139.60.0148.3188.3145.50.0139.1139.3139.80.0134.2130.2133.90.0142.8134.0168.30.0129.8126.8133.20.0131.1131.8129.4

brka:RailroadUtilitiesAndEnergy


Costs
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value937691498966895084807210789282628706846582068838878586658111852076847637744774537444693570047361769076527600
Percentage of CostsAndExpenses14.815.016.015.214.911.814.513.715.515.115.315.315.916.115.515.613.914.812.515.115.314.715.216.617.116.818.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.119.020.113.919.519.319.012.619.319.019.413.919.319.619.514.512.713.311.412.812.612.713.414.213.014.915.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:RailroadUtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Gain Loss On Investments

us-gaap:GainLossOnInvestments

us-gaap:GainLossOnInvestments


Gain
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4851271735211388733162539289-68882.03104410692983519552-34905.0145695990-7809.0148657290315191031506431850648826636297454-376.02366113113541714492505526917125-106.0300921289-407.0-74.04583831318
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.956.511.760.472.7105.1-166.247.523.722.146.1-54.832.113.5-18.80.31.10.50.53.35.31.23.51.314.00.70.20.9-0.74.82.52.93.71.11.21.22.20.3-0.30.80.33.4-1.2-0.21.31.24.1

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value124843572114528454033793035409-63049.036801204891775927647-32721.02314715098-1523.0639156306129568893141052573726456738114072584676475841675089166598
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.574.232.670.587.294.7-152.156.345.439.965.2-51.451.034.1-3.710.89.310.78.716.017.813.512.314.223.911.415.712.113.217.914.5

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value121073557414277450103764035666-63349.036561198451763527479-29510.02283114771-1924.042535378582054499062103007166621658676750891665987232737868917295675459364615493144523363526522346481453429385098
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.773.932.069.986.595.4-152.855.943.939.764.8-46.350.333.4-4.67.28.910.18.415.517.413.211.912.213.217.914.515.415.915.416.615.114.512.012.911.710.013.86.617.912.59.315.9

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value184072962688927375179002-13352.07571383235865915-7330.044403021-452.0-26265.0142717741549295931922290799183445451739241416232029245818252169222522792278209318821384156512619531725629200814158481336
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.815.26.014.417.324.1-32.211.68.58.114.0-11.59.86.8-1.1-44.62.43.12.45.15.44.21.53.57.73.45.03.44.04.94.04.64.85.15.24.74.63.64.13.32.84.51.95.63.92.74.2

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14942252256228617353855951020319673546437716192069289151269210562624821182824231196014478802488131050186828313731304248324117991518117919915335505712315177112009310
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.04.70.63.64.01.01.41.67.11.71.10.63.64.70.72.61.11.80.04.32.01.50.43.82.51.70.51.72.13.80.62.92.85.60.54.03.73.10.54.01.61.50.71.42.06.31.0

Interest Expense

us-gaap:InterestExpense us-gaap:ConsolidationItems

us-gaap:InterestExpense

us-gaap:MaterialReconcilingItems


Interest
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1281441141201161111361049610710938160-320.0337251386646211-288.0201-31.0348
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.30.30.20.30.30.30.20.20.20.30.60.1-0.70.80.40.61.10.3-0.50.3-0.10.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense us-gaap:ProductOrService

brka:InsuranceAndOther


Interest
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value286298276288263258296266261267262263252255390335435700270-229.0259283871188217144
Percentage of InterestExpense223.4206.9242.1240.0226.7232.4217.6255.8271.9249.5240.469.0420.0-79.7115.7133.5112.7108.4128.079.5128.9-90.3111.20.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.60.60.40.60.70.70.40.60.60.60.40.60.60.90.60.71.20.4-0.40.40.10.70.00.10.40.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther0.80.80.80.00.80.90.90.00.80.80.80.00.80.81.20.01.42.20.90.00.80.11.40.00.30.80.6

brka:RailroadUtilitiesAndEnergy


Interest
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value7707787747697377447287277247257297086987027101164700697693680681596685696672653632
Percentage of InterestExpense601.6540.3678.9640.8635.3670.3535.3699.0754.2677.6668.8185.81163.3-219.4210.7463.7181.3107.9328.4-236.1338.8-1922.6196.80.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.61.71.21.72.01.81.11.61.61.71.11.51.61.72.01.21.21.11.21.21.11.31.31.11.31.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:RailroadUtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value103442809411711358353013726295-49746.029159165241407321661-25392.01854012011-1138.0325514067426240606286719850015589547894284013516441554617639547054990505345414892455139203108324530482278341715114377298919683633305632383295-1534.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.158.426.255.769.370.3-120.044.636.631.751.1-39.940.827.1-2.755.36.77.46.210.812.29.210.710.616.07.810.68.69.012.910.410.610.910.211.210.29.58.18.58.06.88.94.512.18.26.211.310.110.811.1-6.7

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3003311292952761124971133100711.0167666710513693796913581686999946963104636873100711251101341231211431321239496130122179
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.70.30.50.60.30.10.10.30.20.20.00.40.10.20.20.20.20.10.10.20.10.10.10.20.20.10.10.20.10.10.20.20.20.30.20.30.30.30.40.40.30.30.30.40.40.6

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value393543158240085-70275.031311109261004820322-35508.0147066362-8015.0163965225775
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax61.172.6107.2-169.547.924.222.647.9-55.732.414.4-19.30.31.60.41.2

us-gaap:NonoperatingIncomeExpense us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Nonoperating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value393543158240085-70275.031311109261004820322-35508.0147066362-8015.0163965225775
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax61.172.6107.2-169.547.924.222.647.9-55.732.414.4-19.30.31.60.41.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Expenses

us-gaap:OperatingExpenses us-gaap:ProductOrService

us-gaap:OperatingExpenses

us-gaap:CargoAndFreight


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value352735883510349531612871359337303839388539824207401239743852
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.27.57.95.47.37.78.75.78.58.79.46.68.89.09.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CargoAndFreight0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:OperatingIncomeLoss

brka:CorporateReconcilingItemsAndEliminations


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value46-299.0494-811.0-759.0-218.0216-453.0477-108.0163483-127.0-212.0-219.0-777.0-278.0-296.0-259.0-478.0-477.0-213.0-213.0-259.0-354.0-212.0
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.61.1-1.3-1.7-0.60.5-0.71.1-0.20.40.8-0.3-0.5-0.5-1.3-0.5-0.5-0.4-0.8-0.8-0.4-0.4-0.5-0.6-0.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:CorporateReconcilingItemsAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value72688623819765996958654468465807853878027103589683128301664751185077653751446259737065055737598069096059626657946896655552915634553162135885444654425853
Percentage of OperatingIncomeLoss15800.0-2883.91659.3-813.7-916.7-3001.83169.4-1281.91789.9-7224.14357.71220.7-6544.9-3915.6-3035.2-658.7-1826.3-2208.4-1986.1-1309.4-1545.1-3054.0-2693.4-2308.9-1951.7-2858.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.817.918.410.216.017.516.58.918.917.516.89.318.318.816.08.78.411.47.910.712.511.910.911.511.711.812.912.013.513.211.612.011.913.913.49.913.315.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:IncomeStatementLocation, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:InvestmentIncome, brka:BerkshireHathawayInsuranceGroup


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value133714561412146912201613164716841782164914851451145513921205124412461283112910761029123511421084104513341087
Percentage of OperatingIncomeLoss2906.5-487.0285.8-181.1-160.7-739.9762.5-371.7373.6-1526.9911.0300.4-1145.7-656.6-550.2-160.1-448.2-433.4-435.9-225.1-215.7-579.8-536.2-418.5-295.2-629.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.73.03.22.32.84.34.02.63.93.73.52.33.23.12.92.12.12.21.71.81.72.32.22.11.82.62.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:InvestmentIncome brka:BerkshireHathawayInsuranceGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:IncomeStatementLocation, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:OperatingSegments, brka:PremiumsEarnedNet, brka:BerkshireHathawayInsuranceGroup, brka:BerkshireHathawayPrimaryGroup


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-23.0166206173-126.096-33.093153167-30.02021352349924652232189
Percentage of OperatingIncomeLoss-50.0-55.541.7-21.316.6-44.0-15.3-20.532.1-154.6-18.441.8-106.3-110.4-45.2-31.7-18.7-78.4-73.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.30.50.3-0.30.3-0.10.10.30.4-0.10.30.30.50.20.40.10.40.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:PremiumsEarnedNet brka:BerkshireHathawayInsuranceGroup brka:BerkshireHathawayPrimaryGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:PremiumsEarnedNet, brka:BerkshireHathawayInsuranceGroup, brka:BerkshireHathawayReinsuranceGroup


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-708.0-327.0-263.0-667.0-441.0-1103.0-489.0-1167.052-104.0-253.0-985.0-163.0297-258.0-685.0-1845.0-375.0-743.0
Percentage of OperatingIncomeLoss-1539.1109.4-53.282.258.1506.0-226.4257.610.996.3-155.2-203.9128.3-140.1117.888.2663.7126.7286.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.4-0.7-0.6-1.0-1.0-3.0-1.2-1.80.1-0.2-0.6-1.5-0.40.7-0.6-1.2-3.0-0.7-1.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:PremiumsEarnedNet brka:BerkshireHathawayInsuranceGroup brka:BerkshireHathawayReinsuranceGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:PremiumsEarnedNet, brka:BerkshireHathawayInsuranceGroup, brka:Geico


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-289.062610231082762060984-33.0376393770472627673677-188.0-416.0119175
Percentage of OperatingIncomeLoss-628.3-209.4207.1-13.3-36.4-945.0455.67.378.8-363.9472.497.7-493.7-317.5-309.124.2149.6-40.2-67.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.61.32.30.20.65.52.4-0.10.80.91.80.71.41.51.6-0.3-0.70.20.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:PremiumsEarnedNet brka:BerkshireHathawayInsuranceGroup brka:Geico0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, brka:BerkshireHathawayEnergyCompany


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1375739683405112253341942410615935402341165586487371262670615492124666656945311536495964631051578619232586435553
Percentage of OperatingIncomeLoss2989.1-247.2138.3-49.9-147.8-244.5194.0-93.6222.4-549.1331.348.4-917.3-276.4-222.4-4.8-454.0-226.4-237.5-102.9-261.2-312.7-267.1-174.9-325.7-306.10.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.81.51.50.62.61.41.00.62.31.31.30.42.61.31.20.12.11.20.90.82.11.21.10.92.01.31.21.02.11.21.40.51.31.01.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayEnergyCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value317192123781083929266621095772363210519721140205425961723617-963.012597501940143817451490157916881286183413031926213516611715134123612385100815842350
Percentage of OperatingIncomeLoss689.1-642.5481.4-133.5-122.4-1222.9976.4-127.4495.4-1949.11209.8236.0-1617.3-1224.5-786.8-79.4346.4-425.3-289.6-405.9-301.5-819.2-699.5-609.7-476.8-606.60.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.64.05.31.72.17.15.10.95.24.74.71.84.55.94.21.0-1.62.21.23.32.43.22.83.02.92.53.82.73.84.33.73.62.95.35.42.33.96.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BurlingtonNorthernSantaFeCorporation


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value20291979165919371777149415841871194117731665181618791655151317361710153713451564163312381258172818391536167218741654147211691686155613971289147415081280
Percentage of OperatingIncomeLoss4410.9-661.9335.8-238.8-234.1-685.3733.3-413.0406.9-1641.71021.5376.0-1479.5-780.7-690.9-223.4-615.1-519.3-519.3-327.2-342.3-581.2-590.6-667.2-519.5-724.50.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.14.13.73.04.14.03.82.94.34.03.92.94.13.73.62.92.82.72.12.72.82.32.43.33.13.03.43.93.23.02.63.63.33.12.93.33.73.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BurlingtonNorthernSantaFeCorporation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ManufacturingBusinesses


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value244527142436224522551399211123172484252721943364201221351855143320021939148710611981168714821036125913931205103713371369106890412021151948
Percentage of OperatingIncomeLoss5315.2-907.7493.1-276.8-297.1-641.7977.3-511.5520.8-2339.81346.0696.5-1584.3-1007.1-847.0-184.4-720.1-655.1-574.1-222.0-415.3-792.0-695.8-400.0-355.6-657.10.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.05.65.53.55.23.75.13.55.55.75.25.34.44.84.52.43.33.42.31.83.43.12.82.02.12.72.52.12.62.82.31.92.62.62.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:ManufacturingBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:McLaneCompany


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-8.08410346964465685059111754467609745698860106129136118106147131741201261151141261141329813073
Percentage of OperatingIncomeLoss-17.4-28.120.9-5.7-12.6-20.230.1-15.010.5-54.668.115.5-34.6-31.6-27.4-12.5-16.2-23.3-34.0-12.6-22.2-60.6-63.8-45.6-29.9-69.30.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.20.20.10.20.10.20.10.10.10.30.10.10.20.10.20.10.10.10.10.20.20.30.20.20.30.30.20.20.30.30.20.30.30.30.20.30.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:McLaneCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ServiceAndRetailingBusinesses


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value11101186938883779408558550639745621856628697515644491555393590449457324460378498384451355453287
Percentage of OperatingIncomeLoss2413.0-396.7189.9-108.9-102.6-187.2258.3-121.4134.0-689.8381.0177.2-494.5-328.8-235.2-82.9-176.6-187.5-151.7-123.4-94.1-214.6-152.1-177.6-106.8-234.90.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.52.11.41.81.11.30.81.41.71.51.31.41.61.21.10.81.00.61.00.80.80.60.90.61.00.80.90.70.90.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:ServiceAndRetailingBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-627.0358-320.0980803767-1531.0198-751.045310-1111.0-124.0-1363.033584023598361957967455-982.0-697.0-2522.01768-7266.0590-3898.0-1517.0-1247.037710529162136357854684483307-1777.07883
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.30.7-0.71.51.82.1-3.70.3-1.70.10.7-1.7-0.3-3.10.814.35.96.38.912.8-1.7-1.3-4.83.4-12.31.1-8.0-3.1-2.40.82.319.52.91.312.51.08.1-4.620.7

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-615.0351-327.0777754-1478.0-730.049288-1088.0-119.0-1331.032783883531358257727500-979.0-677.0-2528.01779-7214.0553-3868.0-1454.0-1235.037210249137133258554924503269-1736.078631873-5325.0-738.01185
Percentage of OtherComprehensiveIncomeLossNetOfTax98.198.0102.296.898.396.597.2108.992.997.996.097.797.699.898.199.099.6100.699.797.1100.2100.699.393.799.295.899.098.797.399.797.7101.2100.4100.498.997.799.70.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.30.7-0.71.82.0-3.6-1.60.10.7-1.7-0.3-3.00.814.25.86.28.912.9-1.7-1.2-4.83.4-12.21.1-8.0-3.0-2.40.72.319.42.91.312.51.08.0-4.520.64.9-15.8-1.93.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Other
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-12.07.07.02613-53.0-21.0-4.022-23.0-5.0-32.08.014673724-45.0-3.0-20.06.0-11.0-52.037-30.0-63.0-12.05.028-7.0-24.0-2.038-41.0203.0-130.0155.0
Percentage of OtherComprehensiveIncomeLossNetOfTax1.92.0-2.23.21.73.52.8-8.97.12.14.02.32.40.21.91.00.4-0.60.32.9-0.2-0.60.76.30.84.21.01.32.7-1.2-0.4-0.41.12.30.30.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.00.00.10.0-0.1-0.0-0.00.1-0.0-0.0-0.10.00.00.10.10.0-0.1-0.0-0.00.0-0.0-0.10.1-0.1-0.1-0.00.00.1-0.0-0.1-0.00.1-0.10.10.0-0.40.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:PremiumsEarnedNet

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup, brka:BerkshireHathawayPrimaryGroup


Premiums
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value296427552654251224902244236923402387228721512190205019531918185618521759167616761629151114411446142913091210123611391049953946867816
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.05.75.93.95.76.05.73.65.35.15.13.44.54.44.63.23.13.12.62.92.82.82.72.82.42.52.52.62.22.12.12.01.91.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup brka:BerkshireHathawayPrimaryGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup, brka:BerkshireHathawayReinsuranceGroup


Premiums
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value51594862484752294883431142705148394037073546471537773912354080622324178611841273718721652224318901892197814471702480915832022186822191903
Percentage of PremiumsEarnedNet174.1176.5182.6208.2196.1192.1180.2220.0165.1162.1164.9215.3184.2200.3184.6434.4125.5101.5706.5163.3114.9109.3155.7130.7132.4151.1119.6137.7422.2150.9212.2197.5255.9233.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.510.110.98.111.211.510.37.98.78.38.47.48.38.88.513.73.83.118.24.73.23.04.33.63.23.93.03.59.43.24.44.04.84.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup brka:BerkshireHathawayReinsuranceGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup, brka:Geico


Premiums
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value9604954689238404854090409109908589968869862286588506828479157809754372446845671264746247605059265788561953855328520350814884484647304597
Percentage of PremiumsEarnedNet324.0346.5336.2334.6343.0402.9384.5388.2376.9387.8400.8395.3414.9424.2412.7420.7407.3411.8408.4400.5397.4413.4419.8409.8405.0429.3445.0431.1456.8484.4512.5512.3545.6563.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.619.820.013.119.624.222.013.919.919.920.313.618.718.719.113.312.512.610.511.511.011.511.511.49.810.911.111.010.210.210.710.310.210.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup brka:Geico0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PremiumsEarnedNet us-gaap:ProductOrService

brka:InsuranceAndOther


Premiums
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value17727171631642416145159131559515748165731532314863143191556314333141491337313128133491236721753125941136410799111241084010514104009540
Percentage of PremiumsEarnedNet598.1623.0618.8642.7639.1695.0664.8708.2641.9649.9665.7710.6699.2724.5697.2707.3720.8703.11297.9751.4697.6714.7772.0749.7735.8794.5788.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.235.736.825.136.641.738.025.433.933.433.824.431.632.032.222.322.121.533.421.619.219.821.220.917.820.219.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther48.346.748.70.048.754.349.30.045.043.644.20.043.142.541.90.041.639.072.00.037.235.439.30.038.337.438.3

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value106442842511840361303041326407-49697.029230166571417321732-25391.01870712077-1071.0326564203435541396355733350825657554795274107523342184721645847735063515346125017466140543231336631912410354016054473311920903812
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.759.126.556.169.970.6-119.944.736.931.951.3-39.941.227.3-2.655.46.97.66.310.912.49.310.810.716.28.010.88.79.213.010.510.811.110.311.410.49.98.48.88.47.19.24.812.48.66.611.9

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value30033112927611249133100711.0167666710513693796913581686999946963104636873100711251101341231211431321239496130122179
Percentage of ProfitLoss2.81.21.10.90.4-0.10.80.70.3-0.00.90.5-6.30.33.22.11.91.11.81.61.21.21.02.31.31.52.21.01.41.41.91.52.52.43.33.83.64.55.53.55.92.14.25.84.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.70.30.60.30.10.30.20.20.00.40.10.20.20.20.20.10.10.20.10.10.10.20.20.10.10.20.10.10.20.20.20.30.20.30.30.30.40.40.30.30.30.40.40.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1034428094117113013726295-49746.0165241407321661-25392.01854012011-1138.0325514067426240606286719850015589547894284013516441554617639547054990505345414892455139203108324530482278341715114377298919683633
Percentage of ProfitLoss97.298.898.999.199.6100.199.299.399.7100.099.199.5106.399.796.897.998.198.998.298.498.898.899.097.798.798.597.899.098.698.698.198.597.597.696.796.296.495.594.596.594.197.995.894.295.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.158.426.269.370.3-120.036.631.751.1-39.940.827.1-2.755.36.77.46.210.812.29.210.710.616.07.810.68.69.012.910.410.610.910.211.210.29.58.18.58.06.88.94.512.18.26.211.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value490144811044623643814349437378414526536845169444604239263714454274425541509589076052557518651875834459068544605240351820589895136848644482595119949762454534704946541446934386744720410503854638147379553373938274337203616536274317093203730198299042960722784
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

brka:AutoSales


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value242327502312225921951895190921692250212519372094208320731931
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.95.75.23.55.05.14.63.35.04.84.63.34.64.74.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.95.75.23.55.05.14.63.35.04.84.63.34.64.74.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:AutoSales100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ElectricityAndNaturalGas


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value513841984712387643563319351534904213342936873594426735663524
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.58.710.66.010.08.98.55.39.37.78.75.69.48.18.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.58.710.66.010.08.98.55.39.37.78.75.69.48.18.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ElectricityAndNaturalGas100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:GroceryAndConvenienceStoreDistribution


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value793377297442774479057287785986828298804280358390870982618158
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.216.116.712.018.219.519.013.318.418.119.013.219.218.719.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.216.116.712.018.219.519.013.318.418.119.013.219.218.719.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:GroceryAndConvenienceStoreDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:InsuranceAndOther


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value367223674333698337123270328703319263442634026341283240935208332493325631882363263205531733302293369630536305422827926832274362779224941
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax74.976.475.552.475.276.877.052.775.376.876.555.373.275.176.861.753.055.246.457.851.756.154.051.846.554.151.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax74.976.475.552.475.276.877.052.775.376.876.555.373.275.176.861.753.055.246.457.851.756.154.051.846.554.151.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ManufacturedBuildingProducts


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value500551144399426143223665369538244101414335524495347734312920
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.210.69.96.69.99.88.95.89.19.38.47.17.77.87.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.210.69.96.69.99.88.95.89.19.38.47.17.77.87.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturedBuildingProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ManufacturedConsumerProducts


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value475846044163438440363009332836333528366932902932400841543696
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.79.69.36.89.38.18.05.67.88.37.84.68.89.48.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.79.69.36.89.38.18.05.67.88.37.84.68.89.48.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturedConsumerProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ManufacturedIndustrialAndCommercialProducts


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value564356355413518249434676616360516390654965055947651368436608
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.511.712.18.011.412.514.99.314.114.715.39.314.315.515.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.511.712.18.011.412.514.99.314.114.715.39.314.315.515.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturedIndustrialAndCommercialProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:OtherRetailAndWholesaleDistribution


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value465547624359449637813107353839513470362634653826366134613210
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.59.99.87.08.78.38.56.07.78.28.26.08.17.87.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.59.99.87.08.78.38.56.07.78.28.26.08.17.87.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:OtherRetailAndWholesaleDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:UtilitiesAndEnergy


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value522543024848403644513419363436244338356638253737441937203679
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.78.910.96.310.29.18.85.59.68.09.05.99.78.48.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.78.910.96.310.29.18.85.59.68.09.05.99.78.48.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:UtilitiesAndEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FoodAndBeverage


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value447843564004380739683787380641194202432141254106407941273997
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.19.19.05.99.110.19.26.39.39.79.76.49.09.39.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.19.19.05.99.110.19.26.39.39.79.76.49.09.39.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:FoodAndBeverage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Service


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value898189627819840079886633763985728717855677968870863083397465
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.318.617.513.018.417.718.413.119.319.218.413.919.018.818.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.318.617.513.018.417.718.413.119.319.218.413.919.018.818.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Service100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

brka:AutoSales, brka:ServiceAndRetailingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value242327502312225921951895190921692250212519372094208320731931
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.95.75.23.55.05.14.63.35.04.84.63.34.64.74.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.95.75.23.55.05.14.63.35.04.84.63.34.64.74.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:AutoSales brka:ServiceAndRetailingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ElectricityAndNaturalGas, brka:BerkshireHathawayEnergyCompany


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value513841984712387643563319351534904213342936873594426735663524
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.58.710.66.010.08.98.55.39.37.78.75.69.48.18.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.58.710.66.010.08.98.55.39.37.78.75.69.48.18.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ElectricityAndNaturalGas brka:BerkshireHathawayEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:GroceryAndConvenienceStoreDistribution, brka:McLaneCompany


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value793377297442774479057287785986828298804280358390870982618158
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.216.116.712.018.219.519.013.318.418.119.013.219.218.719.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.216.116.712.018.219.519.013.318.418.119.013.219.218.719.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:GroceryAndConvenienceStoreDistribution brka:McLaneCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ManufacturedBuildingProducts, brka:ManufacturingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value500551144399426143223665369538244101414335524506347334312920
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.210.69.96.69.99.88.95.89.19.38.47.17.67.87.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.210.69.96.69.99.88.95.89.19.38.47.17.67.87.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturedBuildingProducts brka:ManufacturingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ManufacturedConsumerProducts, brka:ManufacturingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value475846044163438440363009332836333528366932906056283841543696
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.79.69.36.89.38.18.05.67.88.37.89.56.29.48.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.79.69.36.89.38.18.05.67.88.37.89.56.29.48.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturedConsumerProducts brka:ManufacturingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ManufacturedIndustrialAndCommercialProducts, brka:ManufacturingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value560055865363513348894631611960036346650364596401638467896554
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.411.612.08.011.212.414.89.214.014.615.210.014.115.315.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.411.612.08.011.212.414.89.214.014.615.210.014.115.315.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturedIndustrialAndCommercialProducts brka:ManufacturingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ManufacturedIndustrialAndCommercialProducts, brka:ServiceAndRetailingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value434950495445444844464649475454
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturedIndustrialAndCommercialProducts brka:ServiceAndRetailingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:OtherRetailAndWholesaleDistribution, brka:ManufacturingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value742754703761599487605697524534544558521519498
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.51.61.61.21.41.31.51.11.21.21.30.91.11.21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.51.61.61.21.41.31.51.11.21.21.30.91.11.21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:OtherRetailAndWholesaleDistribution brka:ManufacturingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:OtherRetailAndWholesaleDistribution, brka:ServiceAndRetailingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value391340083656373531822620293332542946309229213333311729422712
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.08.38.25.87.37.07.15.06.57.06.95.26.96.66.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.08.38.25.87.37.07.15.06.57.06.95.26.96.66.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:OtherRetailAndWholesaleDistribution brka:ServiceAndRetailingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FoodAndBeverage, brka:McLaneCompany


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value447843564004380739683787380641194202432141254106407941273997
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.19.19.05.99.110.19.26.39.39.79.76.49.09.39.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.19.19.05.99.110.19.26.39.39.79.76.49.09.39.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:FoodAndBeverage brka:McLaneCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Service, brka:BerkshireHathawayEnergyCompany


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value158615931040135714749717939571191122372592311401186700
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.23.32.32.13.42.61.91.52.62.81.71.42.52.71.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.23.32.32.13.42.61.91.52.62.81.71.42.52.71.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Service brka:BerkshireHathawayEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Service, brka:BurlingtonNorthernSantaFeCorporation


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value574757635365563451354558536657855967583757136142609958315580
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.712.012.08.811.812.212.98.813.213.113.59.613.413.213.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.712.012.08.811.812.212.98.813.213.113.59.613.413.213.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Service brka:BurlingtonNorthernSantaFeCorporation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Service, brka:ManufacturingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value400370329351370348387420445429348760262279218
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.80.70.50.90.90.90.61.01.00.81.20.60.60.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.80.70.50.90.90.90.61.01.00.81.20.60.60.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Service brka:ManufacturingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Service, brka:McLaneCompany


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value17518315118614412213241680232031162017
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.40.30.30.30.30.30.60.20.10.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.40.30.30.30.30.30.60.20.10.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Service brka:McLaneCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Service, brka:ServiceAndRetailingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value107310539348728656349619941034104499011889651023950
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.22.11.42.01.72.31.52.32.32.31.92.12.32.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.22.11.42.01.72.31.52.32.32.31.92.12.32.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Service brka:ServiceAndRetailingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

brka:BerkshireHathawayEnergyCompany


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value672457915752523358304290430844475404465244124517540747524224
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.712.012.98.113.411.510.46.812.010.510.47.111.910.710.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.712.012.98.113.411.510.46.812.010.510.47.111.910.710.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:BerkshireHathawayEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:BurlingtonNorthernSantaFeCorporation


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value574757635365563451354558536657855967583757136142609958315580
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.712.012.08.811.812.212.98.813.213.113.59.613.413.213.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.712.012.08.811.812.212.98.813.213.113.59.613.413.213.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:BurlingtonNorthernSantaFeCorporation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ManufacturingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value165051642814957148901421612140141341457714944152781419318281134781517213886
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.734.133.523.132.732.534.122.333.134.433.528.729.734.333.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.734.133.523.132.732.534.122.333.134.433.528.729.734.333.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:McLaneCompany


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value125861226811597117371201711196117971321712580123861218012527128041240812172
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.725.526.018.227.630.028.520.227.927.928.719.728.228.029.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.725.526.018.227.630.028.520.227.927.928.719.728.228.029.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:McLaneCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ServiceAndRetailingBusinesses


Revenue
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value745278606952691562965194584764656274630758946664621260925647
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.216.315.610.714.513.914.19.913.914.213.910.513.713.813.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.216.315.610.714.513.914.19.913.914.213.910.513.713.813.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ServiceAndRetailingBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value705836911464599643816302456840612656536864972635986067863714634506220058473589076052557518651875834459068544605240351820589895136848644482595119949762454534704946541446934386744720410503854638147379553373938274337203616536274317093203730198299042960722784
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax144.0143.7144.8100.0144.9152.1147.8100.0143.8143.0143.1100.0139.7140.5140.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidationItems

brka:CorporateReconcilingItemsAndEliminations


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-73.0-86.0-57.0-59.0-3.081133962401391442183816-22.0-478.0-52.0-133.0-71.0-383.0-183.0-132.0-7.0-337.0-236.0-380.0
Percentage of Revenues-0.1-0.1-0.1-0.1-0.00.10.20.10.40.20.20.30.10.0-0.0-0.8-0.1-0.2-0.1-0.7-0.3-0.2-0.0-0.7-0.4-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.2-0.1-0.1-0.00.20.30.10.50.30.30.30.10.0-0.1-0.8-0.1-0.2-0.1-0.7-0.3-0.2-0.0-0.7-0.4-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:CorporateReconcilingItemsAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value7065669200646566444063027567596113265272647326345960534634966341262184584955922259612574266448355734554185354351130505145162551560471444811751240473264400845257444664384742188422184020239408
Percentage of Revenues100.1100.1100.1100.1100.099.999.899.999.699.899.899.799.9100.0100.0100.598.599.898.995.593.898.397.697.587.5100.496.999.7100.195.196.896.295.598.196.294.497.9102.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax144.2143.8144.9100.1144.9151.9147.599.9143.3142.7142.899.7139.6140.5140.9100.598.599.898.995.593.898.397.697.587.5100.496.999.7100.195.196.896.295.598.196.294.497.9102.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, brka:BerkshireHathawayEnergyCompany


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value70136085592456396226465945074752572049704672471957065050451246895370462342574244519842994118421351444543433142704853418543063179339230563116
Percentage of Revenues9.98.89.28.89.98.27.47.38.87.87.77.49.08.17.78.08.98.06.57.38.87.97.98.18.78.88.98.89.58.49.56.87.36.87.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.312.613.38.814.312.510.97.312.711.211.07.412.611.410.98.08.98.06.57.38.87.97.98.18.78.88.98.89.58.49.56.87.36.87.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayEnergyCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value19066186221783817619171361721017396182581711216517158061702315779155481458614375145971365122885136881240712035122731192811560117381063010758136741082410367103291035410358103781023998329827
Percentage of Revenues27.026.927.627.427.230.328.427.926.326.026.026.724.925.024.924.424.123.735.123.521.022.123.423.019.622.921.922.326.721.822.822.022.223.223.722.924.025.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.938.740.027.439.446.042.027.937.937.237.326.734.735.135.124.424.123.735.123.521.022.123.423.019.622.921.922.326.721.822.822.022.223.223.722.924.025.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BurlingtonNorthernSantaFeCorporation


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value57905809540156745176460254175839602158935762620661475878562456385314525051855310516745854767539656005369560261765881573554475757565153225284542853435062
Percentage of Revenues8.28.48.48.88.28.18.88.99.39.39.59.79.79.59.69.68.89.18.09.18.78.49.110.49.510.511.512.811.511.512.012.212.111.912.012.113.013.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.812.112.18.811.912.313.18.913.313.313.69.713.513.313.59.68.89.18.09.18.78.49.110.49.510.511.512.811.511.512.012.212.111.912.012.113.013.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BurlingtonNorthernSantaFeCorporation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ManufacturingBusinesses


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1749617412159131584115170130331503515557158971620615070215441355213853129341279112819127381209711669120821220110554856891819524886389859534961386418397880488968161
Percentage of Revenues24.825.224.624.624.122.924.523.824.525.524.833.821.422.322.121.721.222.118.620.020.522.420.116.515.618.518.218.618.619.319.017.818.919.918.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.736.235.724.634.934.936.323.835.236.535.533.829.831.331.221.721.222.118.620.020.522.420.116.515.618.518.218.618.619.319.017.818.919.918.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:ManufacturingBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:McLaneCompany


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value12612122951162211761120401121811821132441260412411121991254912822124271218912295127981258112101119541227112049118011202312264122931164312313121511172210454122231154711375107851082695349004
Percentage of Revenues17.917.818.018.319.119.719.320.319.419.520.119.720.220.020.820.921.121.918.620.520.822.122.523.220.823.923.925.523.723.623.026.024.825.524.624.223.223.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.725.626.018.327.730.028.520.327.927.928.819.728.228.129.420.921.121.918.620.520.822.122.523.220.823.923.925.523.723.623.026.024.825.524.624.223.223.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:McLaneCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ServiceAndRetailingBusinesses


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value8679897779587906727960376956762273787462702583166974706265877143652765506093687163316385589165006151629445213820349336053358
Percentage of Revenues12.313.012.312.311.510.611.411.711.411.711.613.111.011.411.312.110.811.49.311.810.711.711.212.510.412.39.37.96.87.27.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.718.717.812.316.716.216.811.716.316.816.613.115.416.015.912.110.811.49.311.810.711.711.212.510.412.39.37.96.87.27.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:ServiceAndRetailingBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ProductOrService

brka:InsuranceAndOther


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value578095725153297531105164947609513785483553270527775028159713492014893946311465604718145709534564507443911435984264040063474213965135880
Percentage of Revenues81.982.882.582.582.083.883.983.982.083.082.993.777.578.779.279.078.079.582.077.374.380.181.477.380.477.273.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax117.9119.0119.482.5118.7127.4123.983.9117.9118.7118.693.7108.3110.6111.679.078.079.582.077.374.380.181.477.380.477.273.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther157.4155.8158.2157.5157.9165.9160.9159.3156.6154.6155.1169.6148.0147.2145.3128.2147.2144.0176.8133.8143.8142.7150.8149.3172.8142.7143.9

brka:RailroadUtilitiesAndEnergy


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value12774118631130211271113759231988710533117021082110397108581181810895101021004410652984394049516103308851884595501069798669891
Percentage of Revenues18.117.217.517.518.016.216.116.118.017.017.117.018.617.517.317.117.617.114.416.317.516.316.918.418.119.220.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.124.725.317.526.224.723.916.125.924.324.517.026.024.624.317.117.617.114.416.317.516.316.918.418.119.220.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:RailroadUtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CargoAndFreight


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value576157785378564951484573538057995982585157256156611258455590
Percentage of Revenues8.28.48.38.88.28.08.88.99.29.29.49.79.69.49.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.812.012.18.811.812.213.08.913.213.213.59.713.513.213.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CargoAndFreight0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:TheKraftHeinzCompany


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value63246615639464416648615760766406
Percentage of Revenues9.09.69.910.211.710.09.410.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.913.714.314.817.814.913.514.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:TheKraftHeinzCompany0.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:StatementBusinessSegments

brka:BerkshireHathawayEnergyCompany


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value701360855924562262264659450747345720497046724702570650504512
Percentage of Revenues9.98.89.28.79.98.27.47.28.87.87.77.49.08.17.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.312.613.38.714.312.510.97.212.711.211.07.412.611.410.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:BerkshireHathawayEnergyCompany104.3105.1103.0107.4106.8108.6104.6106.5105.8106.8105.9104.1105.5106.3106.8

brka:BurlingtonNorthernSantaFeCorporation


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value576157785378564951494572538057995982585157256156611258455590
Percentage of Revenues8.28.48.38.88.28.08.88.99.29.29.49.79.69.49.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.812.012.18.811.812.213.08.913.213.213.59.713.513.213.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:BurlingtonNorthernSantaFeCorporation100.2100.3100.2100.3100.3100.3100.3100.2100.3100.2100.2100.2100.2100.2100.2

brka:InsuranceCorporateAndOther


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value190871862717852176571720217353176051849617431167351602017378158951568114650
Percentage of Revenues27.027.027.627.427.330.528.728.326.826.326.427.325.125.225.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.938.740.027.439.646.442.528.338.637.637.827.335.035.435.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceCorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:ManufacturingBusinesses


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value174561737515880158021514513017150141549415881161911505821489135291591112912
Percentage of Revenues24.725.124.624.524.022.924.523.724.425.524.833.721.325.622.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.636.135.624.534.834.836.223.735.236.435.533.729.836.031.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturingBusinesses105.8105.8106.2106.1106.5107.2106.2106.3106.3106.0106.1117.5100.4104.993.0

brka:McLaneCompany


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value126121229511622117611204011218118211324412604124111219912549128221242712189
Percentage of Revenues17.917.818.018.319.119.719.320.319.419.520.119.720.220.020.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.725.626.018.327.730.028.520.327.927.928.819.728.228.129.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:McLaneCompany100.2100.2100.2100.2100.2100.2100.2100.2100.2100.2100.2100.2100.1100.2100.1

brka:ServiceAndRetailingBusinesses


Revenuesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value865489547943789072626021693876017354744070048297695572866560
Percentage of Revenues12.313.012.312.311.510.611.311.611.311.711.513.011.011.711.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.718.617.812.316.716.116.711.616.316.716.513.015.316.515.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ServiceAndRetailingBusinesses116.1113.9114.3114.1115.3115.9118.7117.6117.2118.0118.8124.5112.0119.6116.2

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense us-gaap:ProductOrService

us-gaap:SellingGeneralAndAdministrativeExpense

brka:InsuranceAndOther


Selling
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value488950453910550551814652447156774384482944326080398441504024414039654020411647313959406637223546372133783078
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.010.58.88.611.912.410.88.79.710.910.59.58.89.49.77.06.67.06.38.16.77.57.16.86.36.66.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther13.313.711.616.315.816.214.016.512.914.113.717.312.012.512.611.412.412.713.614.013.013.313.213.213.612.212.3

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value920758912493884393873729829946788133760448817729788482760108738724707794736459711932702651702095681554665590654451620854604038592816586315552257545468540774531076526186517363504379494944484931458081446563442302427452424115411356411362392647385494382696376496372229297119
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value467372446568369185370553
Percentage of Assets53.554.652.252.8
Percentage of Assets53.554.652.252.8
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

us-gaap:Assets us-gaap:ProductOrService

brka:InsuranceAndOther


Assetsus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value706992700028673636664021635953597734573001630572603016577583558132532307520749497899488106485797464916451341440115409328392454384147386938348282
Percentage of Assets76.876.776.276.076.675.875.477.176.576.075.675.270.769.969.569.268.267.867.265.965.064.866.063.1
Percentage of Assets76.876.776.276.076.675.875.477.176.576.075.675.270.769.969.569.268.267.867.265.965.064.866.063.1
Percentage of Assets brka:InsuranceAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy


Assetsus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value213766212465210757209708193993190399187447187157185466182525180592175487177422175870175082174413176333173369172269169816169672167400165363165012
Percentage of Assets23.223.323.824.023.424.224.622.923.524.024.424.824.124.724.924.825.926.026.327.428.128.228.229.9
Percentage of Assets23.223.323.824.023.424.224.622.923.524.024.424.824.124.724.924.825.926.026.327.428.128.228.229.9
Percentage of Assets brka:RailroadUtilitiesAndEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:TheKraftHeinzCompany


Assetsus-gaap:
Period End2021-09-252021-06-262021-03-272020-12-262020-09-262020-06-272019-12-28
Value948979703898664998309812298306101450
Percentage of Assets0.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.0
Percentage of Assets brka:TheKraftHeinzCompany100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value439683433693428217422393410731390880385213389166386924373717366133355294357040350174351599350141369702361497358171334495331423326558324478293630294147291572286237283159277061267619264655260446246650241575240196235864235041229641231093223686221613215912212231209295161334
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets47.847.548.448.349.549.650.747.649.149.249.650.248.549.250.049.954.254.354.753.954.955.155.353.253.953.953.953.853.653.153.553.753.854.154.355.255.455.856.257.057.556.456.456.254.3

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value24208217772048222257
Percentage of Liabilities5.75.65.86.4
Percentage of Assets2.82.72.93.2
Percentage of Assets srt:ParentCompany5.24.95.56.0

us-gaap:Liabilities us-gaap:ProductOrService

brka:InsuranceAndOther


Liabilitiesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value258911254112254017250223252620239474244628234570238754227533223764222488201718199647200130195784190183184261181478163193163296159699159512140553
Percentage of Liabilities58.958.659.359.261.561.363.560.361.760.961.162.656.557.056.955.951.451.050.748.849.348.949.247.9
Percentage of Assets28.127.828.728.630.430.432.228.730.329.930.331.427.428.028.527.927.927.727.726.327.026.927.225.5
Percentage of Assets brka:InsuranceAndOther36.636.337.737.739.740.142.737.239.639.440.141.838.740.141.040.340.940.841.239.941.641.641.240.4

brka:RailroadUtilitiesAndEnergy


Liabilitiesus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value985249800497808980729077190136880148779787781865628551781431815918139481052810237600475130750517364073495732547242572766
Percentage of Liabilities22.422.622.823.222.123.122.822.622.723.223.422.922.923.223.123.120.620.821.022.022.222.422.324.8
Percentage of Assets10.710.711.111.210.911.411.610.711.111.411.611.511.111.411.511.511.211.311.511.912.212.412.413.2
Percentage of Assets brka:RailroadUtilitiesAndEnergy46.146.146.446.846.847.347.046.947.347.447.446.446.046.346.346.543.143.343.643.443.343.843.844.1

us-gaap:Liabilities us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:TheKraftHeinzCompany


Liabilitiesus-gaap:
Period End2021-09-252021-06-262021-03-272020-12-262020-09-262020-06-272019-12-28
Value44659468964823349587487834914149701
Percentage of Liabilities0.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.0
Percentage of Assets brka:TheKraftHeinzCompany47.148.348.949.749.750.049.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value920758912493884393873729829946788133760448817729788482760108738724707794736459711932702651702095681554665590654451620854604038592816586315552257545468540774531076526186517363504379494944484931458081446563442302427452424115411356411362392647385494382696376496372229297119
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value467372446568369185370553
Percentage of LiabilitiesAndStockholdersEquity53.554.652.252.8
Percentage of Assets53.554.652.252.8
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value472480470409447987443164415155393495371565424791397609382544368877348703375606358094347401348296308278300659292851283001269264263025258661255550248283246043241458240170237456234005227612221890208382202016198071187647184602177379175997164850159957163007160055157318131102
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets51.351.650.750.750.049.948.951.950.450.349.949.351.050.349.449.645.245.244.745.644.644.444.146.345.545.545.545.645.946.446.045.845.545.244.843.943.543.142.842.041.542.642.542.344.1

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value443164424791348703348296
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets50.751.949.349.6
Percentage of Assets srt:ParentCompany94.895.194.594.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

brka:OtherAccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-10.0-42.0-55.0-52.0-24.0-36.0-57.0-9.05.0-7.02234-6.012-17.0
Percentage of StockholdersEquity-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.00.00.0-0.00.0-0.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.00.00.0-0.00.0-0.0
Percentage of Assets brka:OtherAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-1533.0-1572.0-1605.0-1645.0-1302.0-1286.0-1298.0-1369.0-783.0-749.0-766.0-816.0-341.0-420.0-593.0
Percentage of StockholdersEquity-0.3-0.3-0.4-0.4-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.1-0.1-0.2
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.0-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value4104784695365104953424815075364633703756209343176
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.117.815.3
Percentage of Assets0.00.10.10.10.10.10.00.10.10.10.10.10.18.87.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-4834.0-4219.0-4570.0-4243.0-5190.0-5967.0-6721.0-5243.0-5408.0-4678.0-4727.0-5015.0-3927.05857137298
Percentage of StockholdersEquity-1.0-0.9-1.0-1.0-1.3-1.5-1.8-1.2-1.4-1.2-1.3-1.4-1.016.813.2
Percentage of Assets-0.5-0.5-0.5-0.5-0.6-0.8-0.9-0.6-0.7-0.6-0.6-0.7-0.58.36.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-3701.0-3083.0-3379.0-3082.0-4374.0-5140.0-5708.0-4346.0-5137.0-4458.0-4446.0-4603.0-3955.0-3114.0-5268.0
Percentage of StockholdersEquity-0.8-0.7-0.8-0.7-1.1-1.3-1.5-1.0-1.3-1.2-1.2-1.3-1.1-0.9-1.9
Percentage of Assets-0.4-0.3-0.4-0.4-0.5-0.7-0.8-0.5-0.7-0.6-0.6-0.7-0.5-0.4-0.8
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

us-gaap:CashAndCashEquivalentsAtCarryingValue

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value123291500434374039322110609
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.80.50.60.51.9
Percentage of Assets srt:ParentCompany2.63.40.91.10.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ProductOrService

brka:InsuranceAndOther


Cash
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value65156389245682644714230783231838717611517106441375224872774936506579185055925460352472014218362235816826961788535876118156166603945819857974
Percentage of CashAndCashEquivalentsAtCarryingValue0.00.00.0362.70.00.00.0407.60.00.00.0807.40.00.00.0630.40.00.00.0732.10.00.00.0576.70.00.00.00.0
Percentage of Assets7.14.36.45.12.84.15.17.59.05.43.03.95.08.17.23.65.23.02.83.811.310.49.111.110.311.211.011.0
Percentage of Assets brka:InsuranceAndOther9.25.68.46.73.65.46.89.711.87.24.05.27.011.610.45.27.64.54.25.817.416.113.817.60.00.00.00.0

brka:RailroadUtilitiesAndEnergy


Cash
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value4833337432283276373937563923302437123259365226123297336335502910444849625584393938933036269234374691386035223001
Percentage of CashAndCashEquivalentsAtCarryingValue0.00.00.026.60.00.00.020.20.00.00.076.00.00.00.072.00.00.00.0122.30.00.00.032.40.00.00.00.0
Percentage of Assets0.50.40.40.40.50.50.50.40.50.40.50.40.40.50.50.40.70.70.90.60.60.50.50.60.90.70.70.6
Percentage of Assets brka:RailroadUtilitiesAndEnergy2.31.61.51.61.92.02.11.62.01.82.01.51.91.92.01.72.52.93.22.32.31.81.62.10.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value706414283260488483962743736587430966463275291451022652430811421016517658374322124335126982264822864367602
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.74.76.85.53.34.65.77.99.55.93.64.45.79.28.34.66.44.14.04.612.2

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2019119393188861920819361192772017219852199511983419454190691679316194162441618716931164421611515727157631572015837119161199512072116811023610182101991024599459880987796739675947695259055897592657960756471016147
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.12.12.22.32.42.72.42.52.62.62.72.32.32.32.32.52.52.52.52.62.72.72.22.22.22.21.92.02.02.12.12.22.22.22.32.22.32.22.32.42.12.01.92.1

us-gaap:InventoryNet us-gaap:ProductOrService

brka:InsuranceAndOther


Inventory
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value201911939318886192081936119277201721985219951198341945419069167931619416244161871693116442161151572715763157201583711916
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.12.12.22.32.42.72.42.52.62.62.72.32.32.32.32.52.52.52.52.62.72.72.2
Percentage of Assets brka:InsuranceAndOther2.92.82.82.93.03.23.53.13.33.43.53.63.23.33.33.33.63.63.73.84.04.14.13.4

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService

us-gaap:PropertyPlantAndEquipmentGross

brka:InsuranceAndOther


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value443654411643867438174300942471421584221041560412164040839827448724395743471374243697136366357913501134965340303345729617
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.84.85.05.05.25.45.55.25.35.45.55.66.16.26.25.35.45.55.55.65.85.75.75.4
Percentage of Assets brka:InsuranceAndOther6.36.36.56.66.87.17.46.76.97.17.27.58.68.88.97.78.08.18.18.68.98.98.68.5

brka:Railroad


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value799817930378729782637787077356767987663475514747827408773189723967176671285709407026069578689726738066570658986503564355
Percentage of PropertyPlantAndEquipmentGross180.3179.8179.5178.6181.1182.1182.2181.6181.7181.4183.3183.8161.3163.3164.0189.6190.0191.3192.7192.5190.4193.6194.4217.3
Percentage of Assets8.78.78.99.09.49.810.19.49.69.810.010.39.810.110.110.110.310.510.510.911.011.111.111.7
Percentage of Assets brka:Railroad0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value123422122376120747119376105108103082101322101841100118985769691296246949269356192655918919080888937875398717286413853738510084256
Percentage of PropertyPlantAndEquipmentGross278.2277.4275.3272.4244.4242.7240.3241.3240.9239.2239.8241.7211.5212.8213.1245.5245.6244.6244.6249.0247.1250.9254.4284.5
Percentage of Assets13.413.413.713.712.713.113.312.512.713.013.113.612.913.113.213.113.313.413.414.014.314.414.515.3
Percentage of Assets brka:UtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService, us-gaap:PropertyPlantAndEquipmentByType

brka:InsuranceAndOther, brka:FurnitureFixturesAndOther


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value467045924542453046894621465046665064522150494758497246954493438747054395421440804419431842133545
Percentage of PropertyPlantAndEquipmentGross10.510.410.410.310.910.911.011.112.212.712.511.911.110.710.311.712.712.111.811.712.612.712.612.0
Percentage of Assets0.50.50.50.50.60.60.60.60.60.70.70.70.70.70.60.60.70.70.60.70.70.70.70.6
Percentage of Assets brka:InsuranceAndOther brka:FurnitureFixturesAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:InsuranceAndOther, us-gaap:LandBuildingsAndImprovements


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1384613859138511379913555134281327713259
Percentage of PropertyPlantAndEquipmentGross31.231.431.631.531.531.631.531.4
Percentage of Assets1.51.51.61.61.61.71.71.6
Percentage of Assets brka:InsuranceAndOther us-gaap:LandBuildingsAndImprovements0.00.00.00.00.00.00.00.0

brka:InsuranceAndOther, us-gaap:MachineryAndEquipment


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value258492566525474254882476524422242312428523409229652268222574285942793227707219352140921220209832046320103195501920417054
Percentage of PropertyPlantAndEquipmentGross58.358.258.158.257.657.557.557.556.355.756.156.763.763.563.758.657.958.458.658.457.557.457.457.6
Percentage of Assets2.82.82.92.93.03.13.23.03.03.03.13.23.93.93.93.13.13.23.23.33.33.33.33.1
Percentage of Assets brka:InsuranceAndOther us-gaap:MachineryAndEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:Railroad, brka:LandTrackStructureAndOtherRoadway


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value6516764721642786382463318627646264362404613456079560328595095875557408
Percentage of PropertyPlantAndEquipmentGross146.9146.7146.5145.7147.2147.8148.6147.8147.6147.5149.3149.4130.9153.4
Percentage of Assets7.17.17.37.37.68.08.27.67.88.08.28.48.08.2
Percentage of Assets brka:Railroad brka:LandTrackStructureAndOtherRoadway0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:Railroad, brka:LocomotivesFreightCarsAndOtherEquipment


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value137841360113596135231347713516133821348213381132641318513016127311264012600125431245912264121721207511860117581151511320
Percentage of PropertyPlantAndEquipmentGross31.130.831.030.931.331.831.731.932.232.232.632.728.428.829.033.533.733.734.034.533.934.634.438.2
Percentage of Assets1.51.51.51.51.61.71.81.61.71.71.81.81.71.81.81.81.81.81.91.92.02.02.02.0
Percentage of Assets brka:Railroad brka:LocomotivesFreightCarsAndOtherEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:Railroad, us-gaap:ConstructionInProgress


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value10309818559161075107677374878872357466491010399439899278968109651064113110311031
Percentage of PropertyPlantAndEquipmentGross2.32.21.92.12.52.51.81.81.91.81.41.72.02.42.22.62.52.52.32.83.03.33.13.5
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.20.20.2
Percentage of Assets brka:Railroad us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy, brka:UtilityGenerationTransmissionAndDistributionSystems


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value890268874887898867308274381518805308112778596780877765977288757517497575068746607313872317713087153670316699556988069248
Percentage of PropertyPlantAndEquipmentGross200.7201.2200.4197.9192.4191.9191.0192.2189.1189.5192.2194.1168.8170.6172.7199.5197.8198.9199.2204.3201.1205.6208.9233.8
Percentage of Assets9.79.79.99.910.010.310.69.910.010.310.510.910.310.510.710.610.710.910.911.511.611.811.912.5
Percentage of Assets brka:UtilitiesAndEnergy brka:UtilityGenerationTransmissionAndDistributionSystems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy, us-gaap:ConstructionInProgress


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value434338873309330851324499381937325313433133883110372432042735255635032607235020983175270127572627
Percentage of PropertyPlantAndEquipmentGross9.88.87.57.511.910.69.18.812.810.58.47.88.37.36.36.89.57.26.66.09.17.98.28.9
Percentage of Assets0.50.40.40.40.60.60.50.50.70.60.50.40.50.50.40.40.50.40.40.30.50.50.50.5
Percentage of Assets brka:UtilitiesAndEnergy us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy, us-gaap:OtherEnergyEquipment


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1300912969128281267189528850879288178572858783188324815681427622749971767044693765966056588256655626
Percentage of PropertyPlantAndEquipmentGross29.329.429.228.920.820.820.920.920.620.820.620.918.218.517.520.019.419.419.418.817.317.316.919.0
Percentage of Assets1.41.41.51.51.11.11.21.11.11.11.11.21.11.11.11.11.11.11.11.11.01.01.01.0
Percentage of Assets brka:UtilitiesAndEnergy us-gaap:OtherEnergyEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy, us-gaap:Pipelines


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1704416772167121666782818215818181657637757175477524729572407230717669916969694469426866683567986755
Percentage of PropertyPlantAndEquipmentGross38.438.038.138.019.319.319.419.318.418.418.718.916.316.516.619.218.919.219.419.819.620.120.322.8
Percentage of Assets1.91.81.91.91.01.01.11.01.01.01.01.11.01.01.01.01.01.01.11.11.11.21.21.2
Percentage of Assets brka:UtilitiesAndEnergy us-gaap:Pipelines0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:ProductOrService

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

brka:InsuranceAndOther


Accumulated
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value236432325122877226172186821349209002077220330200121958319199205152000919664173201702516576161461568615639149581449914077
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.62.52.62.62.62.72.72.52.62.62.72.72.82.82.82.52.52.52.52.52.62.52.52.5
Percentage of Assets brka:InsuranceAndOther3.33.33.43.43.43.63.63.33.43.53.53.63.94.04.03.63.73.73.73.84.03.93.74.0

brka:Railroad


Accumulated
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value146411413813687131751272412401121981210111512112061086510004959692598954862782937936758361305673537051354845
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment61.960.859.858.358.258.158.458.356.656.055.552.146.846.345.549.848.747.947.039.136.335.935.434.4
Percentage of Assets1.61.51.51.51.51.61.61.51.51.51.51.41.31.31.31.21.21.21.21.00.90.90.90.9
Percentage of Assets brka:Railroad0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy


Accumulated
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value353613475433990332482985629257286582853628794286372796427651273392685226601260202582925251246512466324305239242394823487
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment149.6149.5148.6147.0136.5137.0137.1137.4141.6143.1142.8144.0133.3134.2135.3150.2151.7152.3152.7157.2155.4159.9165.2166.8
Percentage of Assets3.83.83.83.83.63.73.83.53.73.83.83.93.73.83.83.73.83.83.84.04.04.04.14.3
Percentage of Assets brka:UtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value305318319315315322325331328325333341345355352361368373367405369377339269300282255301289285280293248258248254191191183
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ProductOrService

us-gaap:PropertyPlantAndEquipmentNet

brka:InsuranceAndOther


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value207222086520990212002114121122212582143821230212042082520628243572394823807201041994619790196451932519326190721895815540
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.32.32.42.42.52.72.82.62.72.82.82.93.33.43.42.92.93.03.03.13.23.23.22.8
Percentage of Assets brka:InsuranceAndOther2.93.03.13.23.33.53.73.43.53.73.73.94.74.84.94.14.34.44.54.74.95.04.94.5

brka:Railroad


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value653406516565042650886514664955646006453364002635766322263185628006250762331623136196761642613896125060897605285990059510
Percentage of PropertyPlantAndEquipmentNet315.3312.3309.9307.0308.2307.5303.9301.0301.5299.8303.6306.3257.8261.0261.8310.0310.7311.5312.5316.9315.1317.4316.0382.9
Percentage of Assets7.17.17.47.47.88.28.57.98.18.48.68.98.58.88.98.99.19.39.49.910.110.210.210.8
Percentage of Assets brka:Railroad0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:RailroadUtilitiesAndEnergy


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value153401152787151799151216140398138780137264137838135326133515132170131780130387129216128385128184126946125328124277123759123005121977121052120279
Percentage of PropertyPlantAndEquipmentNet740.3732.3723.2713.3664.1657.0645.7643.0637.4629.7634.7638.8535.3539.6539.3637.6636.4633.3632.6640.4636.5639.6638.5774.0
Percentage of Assets16.716.717.217.316.917.618.116.917.217.617.918.617.718.218.318.318.618.819.019.920.420.620.621.8
Percentage of Assets brka:RailroadUtilitiesAndEnergy71.871.972.072.172.472.973.273.673.073.173.275.173.573.573.373.572.072.372.172.972.572.973.272.9

brka:UtilitiesAndEnergy


Property
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value880618762286757861287525273825726647330571324699396894868595675876670966054658716497963686628886250962108614496115260769
Percentage of PropertyPlantAndEquipmentNet425.0419.9413.3406.3356.0349.5341.8341.9336.0329.8331.1332.5277.5278.6277.5327.7325.8321.8320.1323.5321.4322.2322.6391.0
Percentage of Assets9.69.69.89.99.19.49.69.09.09.29.39.79.29.49.49.49.59.69.610.110.310.410.411.0
Percentage of Assets brka:UtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value73770737587369573734718657175381659818828122881269812208102581327812508133781258808828017579951794867939279177791146270862692627996287960714586695879258264570115473554372544075452354143531455316653213533104912549080490063397233781
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.08.18.38.48.79.110.710.010.310.711.011.411.011.411.611.611.912.012.212.813.113.413.511.411.511.611.811.511.311.711.811.811.912.212.312.812.812.912.913.613.812.813.013.211.40.0

us-gaap:Goodwill us-gaap:BusinessAcquisition

brka:DominionsNaturalGasTransmissionAndStorageBusiness


Goodwillus-gaap:
Period End2020-11-01
Value1732
Percentage of Goodwill0.0
Percentage of Assets0.0
Percentage of Assets brka:DominionsNaturalGasTransmissionAndStorageBusiness0.0

us-gaap:Goodwill us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement

brka:BerkshireHathawayEnergyCompany, brka:DominionEnergyInc, brka:FirstAcquisitionAgreement


Goodwillus-gaap:
Period End2020-11-01
Value1700
Percentage of Goodwill0.0
Percentage of Assets0.0
Percentage of Assets brka:BerkshireHathawayEnergyCompany brka:DominionEnergyInc brka:FirstAcquisitionAgreement0.0

us-gaap:Goodwill us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value7373481882810258125879486627086071457011
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.410.011.411.612.811.411.511.8
Percentage of Assets us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value737348188281025812587948662708607145701154523
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.410.011.411.612.811.411.511.812.8
Percentage of Assets us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.0

us-gaap:Goodwill us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, brka:BerkshireHathawayEnergyCompany


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value117639979985199359266933395997784
Percentage of Goodwill16.012.212.212.211.714.915.813.7
Percentage of Assets1.31.21.41.41.51.71.81.6
Percentage of Assets us-gaap:OperatingSegments brka:BerkshireHathawayEnergyCompany0.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value152241528915289154991547415536155471551115511
Percentage of Goodwill20.618.718.919.119.524.825.627.228.4
Percentage of Assets1.71.92.22.22.52.83.03.23.6
Percentage of Assets us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup0.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BurlingtonNorthernSantaFeCorporation


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value148511485114851148451484514845148191481914836
Percentage of Goodwill20.118.118.318.318.723.724.426.027.2
Percentage of Assets1.71.82.12.12.42.72.83.13.5
Percentage of Assets us-gaap:OperatingSegments brka:BurlingtonNorthernSantaFeCorporation0.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ManufacturingBusinesses


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value2551234800340193298132041148331481813341
Percentage of Goodwill34.642.542.040.640.323.724.423.4
Percentage of Assets2.94.34.84.75.22.72.82.8
Percentage of Assets us-gaap:OperatingSegments brka:ManufacturingBusinesses0.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:McLaneCompany


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value232734734734734656657701705
Percentage of Goodwill0.30.90.90.90.91.01.11.21.3
Percentage of Assets0.00.10.10.10.10.10.10.10.2
Percentage of Assets us-gaap:OperatingSegments brka:McLaneCompany0.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ServiceAndRetailingBusinesses


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value61526229628157715745616339373514
Percentage of Goodwill8.37.67.87.17.29.86.56.2
Percentage of Assets0.70.80.90.80.91.10.70.7
Percentage of Assets us-gaap:OperatingSegments brka:ServiceAndRetailingBusinesses0.00.00.00.00.00.00.00.0

us-gaap:Goodwill us-gaap:ProductOrService

brka:InsuranceAndOther


Goodwillus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value470904708047054471214709147034569905705256478564875644956323549855495555079549855458454471543335399453832535645352337188
Percentage of Goodwill63.863.863.863.965.565.569.869.769.569.569.569.567.667.667.767.767.567.968.067.967.867.767.759.3
Percentage of Assets5.15.25.35.45.76.07.57.07.27.47.68.07.57.77.87.88.08.28.38.78.99.09.16.7
Percentage of Assets brka:InsuranceAndOther6.76.77.07.17.47.99.99.09.49.810.110.610.611.011.311.311.712.112.313.213.713.913.810.7

brka:RailroadUtilitiesAndEnergy


Goodwillus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value266802667826641266132477424719246692483024750247822477124702247902477224766247802480224306242342411124186242412424624178
Percentage of Goodwill36.236.236.236.134.534.530.230.330.530.530.530.530.530.530.430.530.730.330.330.330.530.630.638.6
Percentage of Assets2.92.93.03.03.03.13.23.03.13.33.43.53.43.53.53.53.63.73.73.94.04.14.14.4
Percentage of Assets brka:RailroadUtilitiesAndEnergy12.512.612.612.712.813.013.213.313.313.613.714.114.014.114.114.214.114.014.114.214.314.514.714.7

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill


Indefinite
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312012-09-302012-06-302012-03-312011-12-31
Value183001830018300183001830018300190001900018800189001890018900189001890018900189301880018800187001870529643140314931882586260422212273227422672250
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.02.02.12.12.22.32.52.32.42.52.62.72.62.72.72.72.82.82.93.00.50.60.60.60.50.50.50.50.60.60.6

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:ProductOrService

us-gaap:IntangibleAssetsNetExcludingGoodwill

brka:InsuranceAndOther


Intangible
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value28643288532918429462296522984730693310513078831032312663149931626319253226032518329743322033472334813503435179352679148
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.13.23.33.43.63.84.03.83.94.14.24.54.34.54.64.64.85.05.15.45.85.96.01.7
Percentage of Assets brka:InsuranceAndOther4.14.14.34.44.75.05.44.95.15.45.65.96.16.46.66.77.17.47.68.28.99.29.12.6

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312019-12-31
Value55795941
Percentage of OperatingLeaseRightOfUseAsset100.0100.0
Percentage of Assets0.60.7

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecuritiesFvNi


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value310739307942282097281170245317207454180782248027220051200516191771172757207332179729170540
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets33.733.731.932.229.626.323.830.327.926.426.024.428.225.224.3

us-gaap:EquitySecuritiesFvNi dei:LegalEntity

brka:AmericanExpressCompany


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value25400251002140018300152001440013000189001790014500
Percentage of EquitySecuritiesFvNi8.28.27.66.56.26.97.27.68.18.4
Percentage of Assets2.82.82.42.11.81.81.72.32.32.0
Percentage of Assets brka:AmericanExpressCompany0.00.00.00.00.00.00.00.00.00.0

brka:AppleInc


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value1284001243001109001204001117009150063800737005700040300
Percentage of EquitySecuritiesFvNi41.340.439.342.845.544.135.329.725.923.3
Percentage of Assets13.913.612.513.813.511.68.49.07.25.7
Percentage of Assets brka:AppleInc0.00.00.00.00.00.00.00.00.00.0

brka:BankOfAmericaCorporation


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value43900426004000031300249002260020200334002780022600
Percentage of EquitySecuritiesFvNi14.113.814.211.110.210.911.213.512.613.1
Percentage of Assets4.84.74.53.63.02.92.74.13.53.2
Percentage of Assets brka:BankOfAmericaCorporation0.00.00.00.00.00.00.00.00.00.0

brka:CocaColaCompany


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value21000216002110021900197001790017700221002180018900
Percentage of EquitySecuritiesFvNi6.87.07.57.88.08.69.88.99.910.9
Percentage of Assets2.32.42.42.52.42.32.32.72.82.7
Percentage of Assets brka:CocaColaCompany0.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:EquitySecuritiesByIndustry

brka:BanksInsuranceAndFinance


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value877408662178811664795621059245628911023959649882592
Percentage of EquitySecuritiesFvNi28.228.127.923.622.928.634.841.343.947.8
Percentage of Assets9.59.58.97.66.87.58.312.512.211.7
Percentage of Assets brka:BanksInsuranceAndFinance0.00.00.00.00.00.00.00.00.00.0

brka:CommercialIndustrialAndOther


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value68605705106705468361540693551333291459984153828544
Percentage of EquitySecuritiesFvNi22.122.923.824.322.017.118.418.518.916.5
Percentage of Assets7.57.77.67.86.54.54.45.65.34.0
Percentage of Assets brka:CommercialIndustrialAndOther0.00.00.00.00.00.00.00.00.00.0

brka:ConsumerProducts


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value15439415081113623214633013503811269684600996348201561621
Percentage of EquitySecuritiesFvNi49.749.048.352.055.054.346.840.237.335.7
Percentage of Assets16.816.515.416.716.314.311.112.210.48.7
Percentage of Assets brka:ConsumerProducts0.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value298633295990271382271848236804199168174889237271209195200165191420172253206985179681170494
Percentage of EquitySecuritiesFvNi96.196.196.296.796.596.096.795.795.199.899.899.799.8100.0100.0
Percentage of Assets32.432.430.731.128.525.323.029.026.526.325.924.328.125.224.3
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8.08.08.03838454446515050203474846
Percentage of EquitySecuritiesFvNi0.00.00.00.00.00.00.00.00.00.00.00.10.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value12098119441070792848475824158491071010805301301301300
Percentage of EquitySecuritiesFvNi3.93.93.83.33.54.03.24.34.90.20.20.20.1
Percentage of Assets1.31.31.21.11.01.00.81.31.40.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, brka:CommonStockWarrants, brka:ValuationTechniqueWarrantPricingModel


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value6127025038610.0572.090136
Percentage of EquitySecuritiesFvNi0.20.20.20.00.00.00.00.00.1
Percentage of Assets0.10.10.10.00.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring brka:CommonStockWarrants brka:ValuationTechniqueWarrantPricingModel0.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:PreferredStock, us-gaap:ValuationTechniqueDiscountedCashFlow


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1117910935989888918159787855401031410363
Percentage of EquitySecuritiesFvNi3.63.63.53.23.33.83.14.24.7
Percentage of Assets1.21.21.11.01.01.00.71.31.3
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring us-gaap:PreferredStock us-gaap:ValuationTechniqueDiscountedCashFlow0.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value310739307942282097281170245317207454180782248027220051200516191771172757207332179729170540
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets33.733.731.932.229.626.323.830.327.926.426.024.428.225.224.3
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value310739307942282097281170245317207454180782248027220051200516191771172757207332179729170540
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets33.733.731.932.229.626.323.830.327.926.426.024.428.225.224.3
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:ProductOrService

brka:InsuranceAndOther


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value310739307942282097281170245317207454180782248027220051200516191771172757201226174033164026
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.097.196.896.2
Percentage of Assets33.733.731.932.229.626.323.830.327.926.426.024.427.324.423.4
Percentage of Assets brka:InsuranceAndOther44.044.041.942.338.634.731.639.336.534.734.432.538.635.033.8

Other Assets

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

us-gaap:OtherAssets

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value1081318079
Percentage of OtherAssets100.0100.0100.0100.0
Percentage of Assets0.00.00.00.0
Percentage of Assets srt:ParentCompany0.00.00.00.0

us-gaap:OtherAssets us-gaap:ProductOrService

brka:InsuranceAndOther


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value163011563815447145801412114021135931323213430130971272693071325011619119391115877937560741771268685746475226697
Percentage of OtherAssets0.00.00.013500.00.00.00.010100.80.00.00.011633.80.00.00.014124.10.00.00.00.00.00.00.00.0
Percentage of Assets1.81.71.71.71.71.81.81.61.71.71.71.31.81.61.71.61.11.11.11.11.41.31.31.2
Percentage of Assets brka:InsuranceAndOther2.32.22.32.22.22.32.42.12.22.32.31.72.52.32.42.31.71.71.71.72.21.91.91.9

brka:RailroadUtilitiesAndEnergy


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value20686217872154721621187231693515391151671491514255133859660160201559015394155891536514129135571355014219138401307012833
Percentage of OtherAssets0.00.00.020019.40.00.00.011577.90.00.00.012075.00.00.00.019732.90.00.00.00.00.00.00.00.0
Percentage of Assets2.22.42.42.52.32.12.01.91.91.91.81.42.22.22.22.22.32.12.12.22.42.32.22.3
Percentage of Assets brka:RailroadUtilitiesAndEnergy9.710.310.210.39.78.98.28.18.07.87.45.59.08.98.88.98.78.17.98.08.48.37.97.8

Debt And Capital Lease Obligations

us-gaap:DebtAndCapitalLeaseObligations

us-gaap:DebtAndCapitalLeaseObligations


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value69006900690068506850685068506850
Percentage of DebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.80.80.80.80.90.90.8

us-gaap:DebtAndCapitalLeaseObligations dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService

brka:BerkshireHathawayFinanceCorporation, srt:Subsidiaries, currency:GBP, brka:InsuranceAndOther


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2315237623672347221821282131227421082179
Percentage of DebtAndCapitalLeaseObligations33.634.434.334.332.431.131.133.20.00.0
Percentage of Assets0.30.30.30.30.30.30.30.30.30.3
Percentage of Assets brka:BerkshireHathawayFinanceCorporation srt:Subsidiaries currency:GBP brka:InsuranceAndOther0.00.00.00.00.00.00.00.00.00.0

brka:BerkshireHathawayFinanceCorporation, srt:Subsidiaries, currency:USD, brka:InsuranceAndOther


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1075710756107561076688298828882886798679992810650
Percentage of DebtAndCapitalLeaseObligations155.9155.9155.9157.2128.9128.9128.9126.70.00.00.0
Percentage of Assets1.21.21.21.21.11.11.21.11.11.31.5
Percentage of Assets brka:BerkshireHathawayFinanceCorporation srt:Subsidiaries currency:USD brka:InsuranceAndOther0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtAndCapitalLeaseObligations dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

brka:BerkshireHathawayEnergySubsidiaries, srt:Subsidiaries, brka:RailroadUtilitiesAndEnergy


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value370963587336461364203169331444300353077229329295172933728196285882872728739
Percentage of DebtAndCapitalLeaseObligations537.6519.9528.4531.7462.7459.0438.5449.20.00.00.00.00.00.00.0
Percentage of Assets4.03.94.14.23.84.03.93.83.73.94.04.03.94.04.1
Percentage of Assets brka:BerkshireHathawayEnergySubsidiaries srt:Subsidiaries brka:RailroadUtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:BurlingtonNorthernSantaFeAndSubsidiaries, srt:Subsidiaries, brka:RailroadUtilitiesAndEnergy


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value23255232532281623220232452325223165232112399023192232172322622499
Percentage of DebtAndCapitalLeaseObligations337.0337.0330.7339.0339.3339.4338.2338.80.00.00.00.00.0
Percentage of Assets2.52.52.62.72.83.03.02.83.03.13.13.33.2
Percentage of Assets brka:BurlingtonNorthernSantaFeAndSubsidiaries srt:Subsidiaries brka:RailroadUtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtAndCapitalLeaseObligations us-gaap:ConsolidatedEntities

srt:ParentCompany


Debt
Period End2020-12-312019-12-312018-12-312017-12-31
Value22665199031687118767
Percentage of DebtAndCapitalLeaseObligations330.9290.60.00.0
Percentage of Assets2.62.42.42.7
Percentage of Assets srt:ParentCompany4.84.54.65.1

us-gaap:DebtAndCapitalLeaseObligations us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService

srt:ParentCompany, currency:EUR, brka:InsuranceAndOther


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value793481238033832679867653751376417422774676387806789779508164
Percentage of DebtAndCapitalLeaseObligations115.0117.7116.4121.5116.6111.7109.7111.50.00.00.00.00.00.00.0
Percentage of Assets0.90.90.91.01.01.01.00.90.91.01.01.11.11.11.2
Percentage of Assets srt:ParentCompany currency:EUR brka:InsuranceAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

srt:ParentCompany, currency:JPY, brka:InsuranceAndOther


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value702870385624603159025767397839383962
Percentage of DebtAndCapitalLeaseObligations101.9102.081.588.086.284.258.157.50.0
Percentage of Assets0.80.80.60.70.70.70.50.50.5
Percentage of Assets srt:ParentCompany currency:JPY brka:InsuranceAndOther0.00.00.00.00.00.00.00.00.0

srt:ParentCompany, currency:USD, brka:InsuranceAndOther


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value6817731473118308832083188328832483219070906690659058980910603
Percentage of DebtAndCapitalLeaseObligations98.8106.0106.0121.3121.5121.4121.6121.50.00.00.00.00.00.00.0
Percentage of Assets0.70.80.81.01.01.11.11.01.11.21.21.31.21.41.5
Percentage of Assets srt:ParentCompany currency:USD brka:InsuranceAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtAndCapitalLeaseObligations us-gaap:ProductOrService

brka:InsuranceAndOther


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value396454056139556415223889138243374863759037176360253384734975242712515825663273242726227781274162717527514275672807314599
Percentage of DebtAndCapitalLeaseObligations574.6587.8573.3606.2567.8558.3547.2548.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets4.34.44.54.84.74.94.94.64.74.74.64.93.33.53.73.94.04.24.24.44.64.74.82.6
Percentage of Assets brka:InsuranceAndOther5.65.85.96.36.16.46.56.06.26.26.16.64.75.15.35.65.96.26.26.67.07.27.34.2

brka:RailroadUtilitiesAndEnergy


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value753207466274975753736880068446667476577865018638826334662515625996266462667621786114760701609255908558811585955811057739
Percentage of DebtAndCapitalLeaseObligations1091.61082.11086.61100.31004.4999.2974.4960.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets8.28.28.58.68.38.78.88.08.28.48.68.88.58.88.98.99.09.19.39.59.79.99.910.5
Percentage of Assets brka:RailroadUtilitiesAndEnergy35.235.135.635.935.535.935.635.135.135.035.135.635.335.635.835.634.735.035.434.834.735.035.135.0

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

us-gaap:LongTermDebtAndCapitalLeaseObligations

srt:Subsidiaries, brka:InsuranceAndOther


Long
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value449745684676468246764680524152625304543555195597558356046725
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.50.50.60.60.70.60.70.70.70.80.80.81.0
Percentage of Assets srt:Subsidiaries brka:InsuranceAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value73261658235050356182769596319961936
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.48.07.18.012.411.411.8

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value859583918189817240603758367037723949384737143797381336643651365835743434342933583351323331763077303831593381285728462755267725953049297240353941447243364272411139243777421056164683
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.90.90.90.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.60.50.50.60.60.60.60.50.60.50.50.50.70.70.90.91.11.11.01.01.01.01.11.51.6

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value111111831363134613121268
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.20.20.20.2

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value9059501140112310911048
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value725764915885859820
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value544620732708685658
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value169119882423228921832079
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.30.30.30.3

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value54695882585259346010
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets0.60.70.70.80.8

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value631868796869695070637183
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.80.90.91.01.0

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-312019-12-31
Value849997
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0
Percentage of Assets0.10.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value472480470409447987443164415155393495371565424791397609382544368877348703375606358094347401348296308278300659292851283001269264263025258661255550248283246043241458240170237456234005227612221890208382202016198071187647184602177379175997164850159957163007160055157318131102
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets51.351.650.750.750.049.948.951.950.450.349.949.351.050.349.449.645.245.244.745.644.644.444.146.345.545.545.545.645.946.446.045.845.545.244.843.943.543.142.842.041.542.642.542.344.1

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value443164424791348703348296
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets50.751.949.349.6
Percentage of Assets srt:ParentCompany94.895.194.594.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

brka:OtherAccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-10.0-42.0-55.0-52.0-24.0-36.0-57.0-9.05.0-7.02234-6.012-17.0
Percentage of StockholdersEquity-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.00.00.0-0.00.0-0.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.00.00.0-0.00.0-0.0
Percentage of Assets brka:OtherAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-1533.0-1572.0-1605.0-1645.0-1302.0-1286.0-1298.0-1369.0-783.0-749.0-766.0-816.0-341.0-420.0-593.0
Percentage of StockholdersEquity-0.3-0.3-0.4-0.4-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.1-0.1-0.2
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.0-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value4104784695365104953424815075364633703756209343176
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.117.815.3
Percentage of Assets0.00.10.10.10.10.10.00.10.10.10.10.10.18.87.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-4834.0-4219.0-4570.0-4243.0-5190.0-5967.0-6721.0-5243.0-5408.0-4678.0-4727.0-5015.0-3927.05857137298
Percentage of StockholdersEquity-1.0-0.9-1.0-1.0-1.3-1.5-1.8-1.2-1.4-1.2-1.3-1.4-1.016.813.2
Percentage of Assets-0.5-0.5-0.5-0.5-0.6-0.8-0.9-0.6-0.7-0.6-0.6-0.7-0.58.36.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-3701.0-3083.0-3379.0-3082.0-4374.0-5140.0-5708.0-4346.0-5137.0-4458.0-4446.0-4603.0-3955.0-3114.0-5268.0
Percentage of StockholdersEquity-0.8-0.7-0.8-0.7-1.1-1.3-1.5-1.0-1.3-1.2-1.2-1.3-1.1-0.9-1.9
Percentage of Assets-0.4-0.3-0.4-0.4-0.5-0.7-0.8-0.5-0.7-0.6-0.6-0.7-0.5-0.4-0.8
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value481075478800456176451336419215397253375235428563401558386391372591352500379419361758351052351954311852304093296280286359272615266258261837258627251321249202244839243027240302236760230289224485211431204988202106191588189074181715180269168961163881166784164265162934135785
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets52.252.551.651.750.550.449.352.450.950.850.449.851.550.850.050.145.845.745.346.145.144.944.746.846.146.146.146.246.446.946.546.346.245.945.744.844.644.243.843.042.543.643.643.845.7

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-4834.0-4219.0-4570.0-4243.0-5190.0-5967.0-6721.0-5243.0-5408.0-4678.0-4727.0-5015.0-3927.0-3808.0-2477.0585715018346652430703729829798307773145433982322033941738864427324418645421450494402534897335653299227500270502378125517176541578121106217642058316723128501930717793395421620
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-1.0-0.9-1.0-0.9-1.2-1.5-1.8-1.2-1.3-1.2-1.3-1.4-1.0-1.1-0.716.616.115.314.513.010.911.612.013.112.815.815.917.618.419.219.619.616.516.416.314.414.313.114.210.49.612.713.212.60.00.00.013.10.00.0
Percentage of Assets-0.5-0.5-0.5-0.5-0.6-0.8-0.9-0.6-0.7-0.6-0.6-0.7-0.5-0.5-0.48.37.47.06.66.04.95.25.46.25.97.37.38.18.59.09.19.17.67.57.56.46.45.86.24.54.15.55.85.50.00.00.06.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value3561135643356383563435629356233562735666356203561835630357153572135702356893570235692356713570735689357383571835678356283561835592355733558135568354993547335480360903610937278372383789837864378543781537794377793758637541381313808538042270822714126960
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest7.47.47.87.98.59.09.58.38.99.29.610.19.49.910.210.111.411.712.112.513.113.413.613.814.214.314.514.614.815.015.415.817.117.618.419.420.020.821.022.423.122.722.923.00.00.00.019.90.00.0
Percentage of Assets3.93.94.04.14.34.54.74.44.54.74.85.04.95.05.15.15.25.45.55.75.96.06.16.56.56.66.76.86.97.07.27.37.98.18.48.78.99.29.29.69.89.910.010.10.00.00.09.10.00.0
Percentage of Assets us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value85958391818981724060375836703772394938473714379738133664365136583574343434293358335132333176307730383159338128572846275526772595304929724035394144724336427241113924377742105616492647514715468344402668
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest1.81.81.81.81.00.91.00.91.01.01.01.11.01.01.01.01.11.11.21.21.21.21.21.21.21.31.41.21.21.21.21.21.41.42.02.12.42.42.42.42.42.32.63.40.00.00.03.40.00.0
Percentage of Assets0.90.90.90.90.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.60.50.50.60.60.60.60.50.60.50.50.50.70.70.90.91.11.11.01.01.01.01.11.50.00.00.01.60.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value49477548443145633744462640879137865435235940249337333435684634277332111234650332796331595225578622416622009921583721177720549119829319329218770318222517279716878416362015946515484814845314374813875813370512916412427211972111580111269310944810640010412210070599194948179182889860862277817272153
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest102.8101.2100.098.597.595.393.993.993.092.492.091.191.390.790.072.771.972.472.874.075.474.573.872.672.569.368.967.366.465.464.564.065.665.263.964.963.363.762.564.864.962.461.360.90.00.00.063.50.00.0
Percentage of Assets53.753.151.650.949.348.046.349.247.346.946.445.447.046.145.036.432.933.133.034.134.033.433.034.033.432.031.831.130.830.730.029.630.329.929.229.128.228.227.427.927.627.226.726.60.00.00.029.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value-53072.0-45446.0-39418.0-32853.0-24075.0-14815.0-9700.0-8125.0-5937.0-5242.0-4799.0-3109.0-2691.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1763.0-1363.0-1363.0-1363.0-1363.0-1363.0-1363.0-67.0-67.0-67.0-67.0-18.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-11.0-9.5-8.6-7.3-5.7-3.7-2.6-1.9-1.5-1.4-1.3-0.9-0.7-0.5-0.5-0.5-0.6-0.6-0.6-0.6-0.6-0.7-0.7-0.7-0.7-0.7-0.7-0.7-0.7-0.7-0.6-0.6-0.6-0.7-0.7-0.7-0.0-0.0-0.0-0.0-0.0
Percentage of Assets-5.8-5.0-4.5-3.8-2.9-1.9-1.3-1.0-0.8-0.7-0.6-0.4-0.4-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.0-0.0-0.0-0.0-0.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value356033563535630356263562135615356193565835612356103562235707357133569435681356943568435663356993568135730357103567035620356103558435565355733556035491354653547236082361013727037230378903785637846378073778637771375783753327074
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.93.94.04.14.34.54.74.44.54.74.85.04.85.05.15.15.25.45.55.75.96.06.16.46.56.66.76.86.97.07.27.37.98.18.48.78.99.29.29.69.89.910.010.19.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4947754844314563374446264087913786543523594024933733343568463427733211123465033279633159522557862241662200992158372117772054911982931932921877031822251727971687841636201594651548481484531437481387581337051291641242721197211158011126931094481064001041221007059919486227
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets53.753.151.650.949.348.046.349.247.346.946.445.447.046.145.036.432.933.133.034.134.033.433.034.033.432.031.831.130.830.730.029.630.329.929.229.128.228.227.427.927.627.226.726.629.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-4834.0-4219.0-4570.0-4243.0-5190.0-5967.0-6721.0-5243.0-5408.0-4678.0-4727.0-5015.0-3927.0-3808.0-2477.0585715018346652430703729829798307773145433982322033941738864427324418645421450494402534897335653299227500270502378125517176541578121106217642058317793
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.5-0.5-0.5-0.5-0.6-0.8-0.9-0.6-0.7-0.6-0.6-0.7-0.5-0.5-0.48.37.47.06.66.04.95.25.46.25.97.37.38.18.59.09.19.17.67.57.56.46.45.86.24.54.15.55.85.56.0

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value53072454463941832853240751481597008125593752424799310926911763176317631763176317631763176317631763176317631763176317631763176313631363136313631363136367676767
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.85.04.53.82.91.91.31.00.80.70.60.40.40.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value859583918189817240603758367037723949384737143797381336643651365835743434342933583351323331763077303831593381285728462755267725953049297240353941447243364272411139243777421056164683
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.90.90.90.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.60.50.50.60.60.60.60.50.60.50.50.50.70.70.90.91.11.11.01.01.01.01.11.51.6

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value120671025393061054611761106686798120779848918575771084510464853575568277108778327182956481350235473313
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.621.320.916.427.028.516.418.521.820.717.917.023.019.318.214.118.014.528.116.910.411.210.3

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value23514-22629.01119616649-11855.0-14747.0-27804.0-21077.0183647293-10201.0-21818.0-33461.012222308-19945.06851-5465.0-22532.03322861-1529.0-15371.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.0-47.025.125.9-27.3-39.5-67.1-32.240.716.4-24.1-34.2-73.70.353.7-33.911.3-9.5-34.60.98.5-4.8-48.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-7786.0-5229.0-8349.0-6668.0-8856.0-2474.0-346.0-1779.020982089-1678.0-286.0-10.0-1722.0-3794.0469-1398.0-2484.02015-147.0-3559.03877194
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15.9-10.9-18.7-10.4-20.4-6.6-0.8-2.74.64.7-4.0-0.4-0.0-3.9-9.10.8-2.3-4.33.1-0.4-10.61.222.5

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value27809-17656.01209220959-9150.0-6509.0-21536.0-10659.03018918578-4287.0-11290.0-23075.0680226162-11139.016369500-2161.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax56.7-36.727.132.6-21.0-17.4-52.0-16.366.841.8-10.1-17.7-50.815.463.0-18.927.00.9-3.3

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value26682672267329042583252425852657253424562417261023952387238723532296229622432296224622342125197819891941187119341854181017721675161616161601
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value120671025393061054611761106686798120779848918575771084510464853575568277108778327182956481350235473313
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.621.320.916.427.028.516.418.521.820.717.917.023.019.318.214.118.014.528.116.910.411.210.3

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value103442809411711358353013726295-49746.029159165241407321661-25392.01854012011-1138.0325514067426240606286719850015589547894284013516441554617639547054990505345414892455139203108324530482278341715114377298919683633305632383295-1534.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.158.426.255.769.370.3-120.044.636.631.751.1-39.940.827.1-2.755.36.77.46.210.812.29.210.710.616.07.810.68.69.012.910.410.610.910.211.210.29.58.18.58.06.88.94.512.18.26.211.310.110.811.1-6.7

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value106442842511840361303041326407-49697.029230166571417321732-25391.01870712077-1071.0326564203435541396355733350825657554795274107523342184721645847735063515346125017466140543231336631912410354016054473311920903812
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.759.126.556.169.970.6-119.944.736.931.951.3-39.941.227.3-2.655.46.97.66.310.912.49.310.810.716.28.010.88.79.213.010.510.811.110.311.410.49.98.48.88.47.19.24.812.48.66.611.9

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value30033112927611249133100711.0167666710513693796913581686999946963104636873100711251101341231211431321239496130122179
Percentage of ProfitLoss2.81.21.10.90.4-0.10.80.70.3-0.00.90.5-6.30.33.22.11.91.11.81.61.21.21.02.31.31.52.21.01.41.41.91.52.52.43.33.83.64.55.53.55.92.14.25.84.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.70.30.60.30.10.30.20.20.00.40.10.20.20.20.20.10.10.20.10.10.10.20.20.10.10.20.10.10.20.20.20.30.20.30.30.30.40.40.30.30.30.40.40.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1034428094117113013726295-49746.0165241407321661-25392.01854012011-1138.0325514067426240606286719850015589547894284013516441554617639547054990505345414892455139203108324530482278341715114377298919683633
Percentage of ProfitLoss97.298.898.999.199.6100.199.299.399.7100.099.199.5106.399.796.897.998.198.998.298.498.898.899.097.798.798.597.899.098.698.698.198.597.597.696.796.296.495.594.596.594.197.995.894.295.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.158.426.269.370.3-120.036.631.751.1-39.940.827.1-2.755.36.77.46.210.812.29.210.710.616.07.810.68.69.012.910.410.610.910.211.210.29.58.18.58.06.88.94.512.18.26.211.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value23514-22629.01119616649-11855.0-14747.0-27804.0-21077.0183647293-10201.0-21818.0-33461.012222308-19945.06851-5465.0-22532.03322861-1529.0-15371.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.0-47.025.125.9-27.3-39.5-67.1-32.240.716.4-24.1-34.2-73.70.353.7-33.911.3-9.5-34.60.98.5-4.8-48.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value35813144251934963329321929684840439235963151449737113740258932973262279423553525328533012843427949673389344750134079329927943360296925512207258226142419216025182229196214821689157515461170
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-7786.0-5229.0-8349.0-6668.0-8856.0-2474.0-346.0-1779.020982089-1678.0-286.0-10.0-1722.0-3794.0469-1398.0-2484.02015-147.0-3559.03877194
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15.9-10.9-18.7-10.4-20.4-6.6-0.8-2.74.64.7-4.0-0.4-0.0-3.9-9.10.8-2.3-4.33.1-0.4-10.61.222.5

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:ProductOrService

us-gaap:ProceedsFromIssuanceOfLongTermDebt

brka:InsuranceAndOther


Proceeds
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3.01507144224907.0181516133.039652180199623542711172126921203467856185398718123241
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy


Proceeds
Period End2021-09-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-31
Value1475202117019304324123782439429450.0278062636132013993192094843231011123012541984
Percentage of ProceedsFromIssuanceOfLongTermDebt49166.781.22428.6106.3268.141233.320.818.1147.50.010296.35690.921252.9957.11534.6346.7174.11832.62.91162.16833.310450.061.2

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt us-gaap:ProductOrService

us-gaap:RepaymentsOfLongTermDebt

brka:InsuranceAndOther


Repayments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value529562425584245901502492139962811473477942184093583501130-657.077376738141321211722
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy


Repayments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6316638831312158543174887276259143155512301207122116051761322446244981259522675202212636
Percentage of RepaymentsOfLongTermDebt11.92969.636.4224.7658.392.0116.41779.63.6269.850.911.7157.92873.866.41725.830.22644.039.5-37.112.7164.1137.01646.3631.2175.236.9

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value763259806580899489734998174120436745481585418
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value14.720.418.5-8.519.80.2540.21220.1980.1870.2020.214-8.1910.1920.20.2970.2530.2890.2720.3030.3110.1240.3230.297
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value10225902688978386982588118432843197841054090066941
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value11139525495544855706456928669281005926
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Proceeds From Repayments Of Short Term Debt

us-gaap:ProceedsFromRepaymentsOfShortTermDebt

us-gaap:ProceedsFromRepaymentsOfShortTermDebt


Proceeds
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-624.0-294.0229-56.0104-33.0-1133.0101260408-503.0811-1674.0849-1929.01957-340.037587-758.027071547130-262.0-382.0136710-95.0321-4.0-48.0-296.0-477.0-496.0680-77.0-8.0-904.0853-28.0-734.02104292.01.0-62.0
Percentage of ProceedsFromRepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesDebt us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement

brka:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesDebt

brka:BerkshireHathawayEnergyCompany, brka:DominionEnergyInc, brka:FirstAcquisitionAgreement


Business
Period End2020-11-01
Value5600
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesDebt100.0

brka:ChargeOffsNetOfRecoveriesOnReceivables

brka:ChargeOffsNetOfRecoveriesOnReceivables


Charge
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-31
Value10814328996178
Percentage of ChargeOffsNetOfRecoveriesOnReceivables100.0100.0100.0100.0100.0100.0

brka:CostOfLeasing us-gaap:ProductOrService

brka:CostOfLeasing

brka:InsuranceAndOther


Cost
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value111698288291585474910029731010100010201112978988983
Percentage of CostOfLeasing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:CostsOfServicesAndOperatingExpenses us-gaap:ProductOrService

brka:CostsOfServicesAndOperatingExpenses

brka:UtilitiesAndEnergy


Costs
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value349732203589331231012503272227932981268028423004298128562800
Percentage of CostsOfServicesAndOperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:DebtMaturingDuringPeriod dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

brka:DebtMaturingDuringPeriod

brka:BerkshireHathawayFinanceCorporation, srt:Subsidiaries, brka:InsuranceAndOther, srt:ScenarioForecast, brka:NotesDueTwoThousandThirtyAtOnePointEightFivePercent, us-gaap:SeniorNotes


Debt
Period End2021-03-31
Value750
Percentage of DebtMaturingDuringPeriod100.0

brka:EquityMethodInvestmentDistributionsFromOtherInvestees us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:EquityMethodInvestmentDistributionsFromOtherInvestees

brka:BerkadiaCommercialMortgageLLCPilotTravelCentersLLCAndElectricTransmissionTexasLLC


Equity
Period End2021-09-302021-06-302021-03-31
Value1886896
Percentage of EquityMethodInvestmentDistributionsFromOtherInvestees100.0100.0100.0

brka:EquityMethodInvestmentGoodwillAndIntangibleAssetsImpairmentCharges us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:EquityMethodInvestmentGoodwillAndIntangibleAssetsImpairmentCharges

brka:TheKraftHeinzCompany


Equity
Period End2020-12-312020-09-302020-06-30
Value0.0100700
Percentage of EquityMethodInvestmentGoodwillAndIntangibleAssetsImpairmentCharges0.0100.0100.0

brka:EquityMethodInvestmentNonRecurringDistribution us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:EquityMethodInvestmentNonRecurringDistribution

brka:BerkadiaCommercialMortgageLLCPilotTravelCentersLLCAndElectricTransmissionTexasLLC


Equity
Period End2021-03-31
Value849
Percentage of EquityMethodInvestmentNonRecurringDistribution100.0

brka:PilotTravelCentersLLC


Equity
Period End2021-03-31
Value849
Percentage of EquityMethodInvestmentNonRecurringDistribution100.0

brka:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossAttributableToCommonStockholders us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossAttributableToCommonStockholders

brka:TheKraftHeinzCompany


Equity
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-292018-09-302018-09-292018-06-302018-03-312017-12-302017-09-302017-06-302017-03-312016-12-312016-09-302016-07-032016-04-032015-09-272015-06-282014-12-282014-09-282014-06-29
Value733-27.0563597-1651.0378899449405-12608.061963075699380039441159893944842770896-303.0-344.0-17.0-8.0-53.0
Percentage of EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossAttributableToCommonStockholders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInRegulatoryAssetsAndLiabilities us-gaap:FairValueByFairValueHierarchyLevel

brka:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInRegulatoryAssetsAndLiabilities

us-gaap:FairValueInputsLevel3


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value19000000.020000000.0-16000000.0-40000000.014000000.0-17000000.0-12000000.0-11000000.014000000.03000000.0-5000000.0-9000000.04000000.0-3000000.0-3000000.01000000.01000000.0-1000000.0-5000000.0-6000000.0
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInRegulatoryAssetsAndLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:FinancingReceivableChangeToRetainedEarningsWithAdoptionOfASC326

brka:FinancingReceivableChangeToRetainedEarningsWithAdoptionOfASC326


Financing
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.00.0486
Percentage of FinancingReceivableChangeToRetainedEarningsWithAdoptionOfASC3260.00.00.0100.0

brka:GainLossOnInvestmentsAndGainLossOnDerivativeInstrumentsNetOfTax

brka:GainLossOnInvestmentsAndGainLossOnDerivativeInstrumentsNetOfTax


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value308262473731645-55617.0247398666793416106-28089.0116605118-6426.01076231435041904234739418528054877123920192-107.0206411721214139162211101738521-612.0580382-1534.0713-82.01367202-1106.01411102711831515-3239.0
Percentage of GainLossOnInvestmentsAndGainLossOnDerivativeInstrumentsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:IncreaseDecreaseInDeferredChargesReinsuranceAssumed

brka:IncreaseDecreaseInDeferredChargesReinsuranceAssumed


Increase
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-236.0-221.0-252.0-572.0-181.0-294.0-260.0388-275.0-197.0-273.0-347.0-278.0-278.0-271.01275625233-5783.0-542.0147146-111.0-285.0123107139-251.0-2946.062-278.0-137.010680-389.0-83.02873103196120-695.050-3.0-87.0120117
Percentage of IncreaseDecreaseInDeferredChargesReinsuranceAssumed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests

brka:IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests


Increase
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value-116.0-131.0-115.06.0-41.0-137.017-274.0-16.0-16.0-119.0
Percentage of IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Increase
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value-32.05.04.06.0-4.0-39.0-20.0-98.0-3.05.0-37.0
Percentage of IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests27.6-3.8-3.5100.09.828.5-117.635.818.8-31.231.1

us-gaap:NoncontrollingInterest


Increase
Period End2021-09-302021-06-302021-03-312020-06-302020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value-84.0-136.0-119.0-37.0-98.037-176.0-13.0-21.0-82.0
Percentage of IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests72.4103.8103.590.271.5217.664.281.2131.268.9

brka:InsuranceUnderwritingExpenses us-gaap:ProductOrService

brka:InsuranceUnderwritingExpenses

brka:InsuranceAndOther


Insurance
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value323930653014357932283067292431672708256927562714235221232604239722072378233917652001187020772012187520181612
Percentage of InsuranceUnderwritingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:InvestmentIncomeInterestDividendAndOther us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

brka:InvestmentIncomeInterestDividendAndOther

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup


Investment
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value133914591414147412231615164816851789165414871460144613991213124712481284113210941043123611491088104613381090
Percentage of InvestmentIncomeInterestDividendAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:InvestmentIncomeInterestDividendAndOther us-gaap:ProductOrService

brka:InsuranceAndOther


Investment
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value17951898185119491717215022762345248322952117321016191534131513401320132211624411276161713911599113213231303
Percentage of InvestmentIncomeInterestDividendAndOther134.1130.1130.9132.2140.4133.1138.1139.2138.8138.8142.4219.9112.0109.6108.4107.5105.8103.0102.740.3122.3130.8121.1147.0108.298.9119.5

brka:LimitedLiabilityCompanyLLCMembersOrLimitedPartnersOwnershipInterestAcquired us-gaap:ConsolidatedEntities, us-gaap:Ownership, us-gaap:OtherCommitments

brka:LimitedLiabilityCompanyLLCMembersOrLimitedPartnersOwnershipInterestAcquired

srt:ParentCompany, brka:PilotTravelCentersLLC, brka:AgreementToAcquireAdditionalInterest


Limited
Period End2021-09-302021-06-302021-03-31
Value0041.4
Percentage of LimitedLiabilityCompanyLLCMembersOrLimitedPartnersOwnershipInterestAcquired0.00.0100.0

brka:OtherNonCashIncomeExpenseIncludingAssetImpairmentCharges

brka:OtherNonCashIncomeExpenseIncludingAssetImpairmentCharges


Other
Period End2020-12-312020-09-302019-12-312019-09-30
Value-329.0-414.0-486.01003
Percentage of OtherNonCashIncomeExpenseIncludingAssetImpairmentCharges100.0100.0100.0100.0

brka:PaymentsToAcquireBusinessesNetOfPostClosingAdjustments us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement

brka:PaymentsToAcquireBusinessesNetOfPostClosingAdjustments

brka:BerkshireHathawayEnergyCompany, brka:DominionEnergyInc, brka:FirstAcquisitionAgreement


Payments
Period End2020-11-01
Value2500
Percentage of PaymentsToAcquireBusinessesNetOfPostClosingAdjustments100.0

brka:PaymentsToAcquireEquitySecurities

brka:PaymentsToAcquireEquitySecurities


Payments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value14151017257277551760679740033552122561307152746581770760801476553901308
Percentage of PaymentsToAcquireEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:PaymentsToAcquireUSTreasuryBillsAndAvailableForSaleSecuritiesDebt

brka:PaymentsToAcquireUSTreasuryBillsAndAvailableForSaleSecuritiesDebt


Payments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value66686741832313545324072881618315516393454353583630918563423527537190130375189538050
Percentage of PaymentsToAcquireUSTreasuryBillsAndAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:PercentageOfIncreaseOrDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet us-gaap:ProductOrService

brka:PercentageOfIncreaseOrDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance


Percentage
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.40.60.80.40.09700.0030.0050.005-0.0010.002-0.0030.0090.0050.013
Percentage of PercentageOfIncreaseOrDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:PolicyholderBenefitsAndClaimsIncurredLifeAnnuityAndHealth us-gaap:ProductOrService

brka:PolicyholderBenefitsAndClaimsIncurredLifeAnnuityAndHealth

brka:InsuranceAndOther


Policyholder
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value15681459148017111311140713831741117611659041546144814181287191512131263122713841339124111671330116517381180
Percentage of PolicyholderBenefitsAndClaimsIncurredLifeAnnuityAndHealth100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ProceedsFromRedemptionsAndMaturitiesOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt

brka:ProceedsFromRedemptionsAndMaturitiesOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt


Proceeds
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value257533998237559684572683050728369443025319354169321114293031225636398350882106131502
Percentage of ProceedsFromRedemptionsAndMaturitiesOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ProceedsFromSaleOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt

brka:ProceedsFromSaleOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt


Proceeds
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value5131672440908129110557361532823276869439923341279075295797135771418414979
Percentage of ProceedsFromSaleOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ProceedsFromSalesOfEquitySecurities

brka:ProceedsFromSalesOfEquitySecurities


Proceeds
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value337921456451101921282113577216672092667
Percentage of ProceedsFromSalesOfEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ProvisionsForCreditLossesOnReceivables

brka:ProvisionsForCreditLossesOnReceivables


Provisions
Period End2020-12-31
Value115
Percentage of ProvisionsForCreditLossesOnReceivables100.0

brka:ServiceRevenuesAndOtherIncome us-gaap:ProductOrService

brka:ServiceRevenuesAndOtherIncome

brka:RailroadUtilitiesAndEnergy


Service
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value17881783107615861776123987311101382140484796512871330833
Percentage of ServiceRevenuesAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:SharesIssuedAndRepurchased

brka:SharesIssuedAndRepurchased


Shares
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-9260.0-5115.0-1575.0-695.0-435.0-1677.0-413.0-906.08.02410.03139-1261.0321239
Percentage of SharesIssuedAndRepurchased100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:SharesIssuedAndRepurchased us-gaap:StatementEquityComponents

us-gaap:TreasuryStock


Shares
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-9260.0-5115.0-1575.0-695.0-443.0-1690.0-418.0-928.0
Percentage of SharesIssuedAndRepurchased100.0100.0100.0100.0101.8100.8101.2102.4

brka:TaxableGainsLossOnSalesOfEquitySecurities

brka:TaxableGainsLossOnSalesOfEquitySecurities


Taxable
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value941228180055343900-4500.012001240609832
Percentage of TaxableGainsLossOnSalesOfEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

brka:EquitySecuritiesFvNi, brka:InvestmentConcentrationRisk


Concentration
Period End2021-03-312020-03-312019-03-312018-12-312018-09-302018-06-302017-12-31
Value69.00.690.680.680.690.70.65
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2415203.012251616597.05.0294448359215615
Percentage of DebtSecuritiesAvailableForSaleRealizedGain100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss


Debt
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value7.0121.05.02.0146.07.02.06.010.07510.04.01386.02.08.0
Percentage of DebtSecuritiesAvailableForSaleRealizedLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value207220662072228919671895196820251905183817981167205020322035199219281923187618911877185717861710168816581617138213541345133713321296126512531265114211411135117010941100915
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation us-gaap:ProductOrService

brka:InsuranceAndOther


Depreciationus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value577572576595578577570609568550542232652653649581547547542553558544493440416420404
Percentage of Depreciation27.827.727.826.029.430.429.030.129.829.930.119.931.832.131.929.228.428.428.929.229.729.327.625.724.625.325.0

brka:RailroadUtilitiesAndEnergy


Depreciationus-gaap:
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value149514941496169413891318139814161337128812561420123412191225124812151214117511801161115711411107112110891066
Percentage of Depreciation72.272.372.274.070.669.671.069.970.270.169.9121.760.260.060.262.763.063.162.662.461.962.363.964.766.465.765.9

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value14-51.0-61.0432-200.044-184.0120-121.01115-31.0-68.0-133.0922639
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentDividendsOrDistributions

brka:TheKraftHeinzCompany


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value131130130130131130130130131130130204203204203203203
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiGainLoss


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4834271585060383583216739282-68892.03115610624983219554-34871.0145385942-8047.0
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value75144430-135.01330-87.0-410.011211355.0161-16.0244357-240.0
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss


Equity
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4759270144630384933083739369-68482.03003510489982719393-34855.0142945585-7807.0
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-31
Value1547368232342392-4861.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0

us-gaap:SecuritiesAssets, us-gaap:FairValueInputsLevel3


Fair
Period End2020-12-312019-12-31
Value809-95.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings10.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-09-302021-06-302021-03-31
Value0.0500600
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements0.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:StockOption, us-gaap:FairValueInputsLevel3


Fair
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-31
Value70221489-43.0796-1393.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements

us-gaap:StockOption, us-gaap:FairValueInputsLevel3


Fair
Period End2021-03-31
Value-1000000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements100.0

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings

us-gaap:FairValueInputsLevel3


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6751931059-1324.0444394314820-564.0190432-176.066349-26.0499110151629-766.0
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements

us-gaap:FairValueInputsLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value-133000000.0-222000000.0-43000000.0-154000000.0-84000000.0-44000000.0-62000000.0-53000000.0-26000000.0-28000000.0-27000000.0-23000000.0-46000000.0-21000000.0-14000000.0
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs


Financing
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value118.0141948143732373333
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:LongtermDebtType

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

brka:BerkshireHathawayFinanceCorporation, srt:ParentCompany, brka:InsuranceAndOther, us-gaap:SeniorNotes


Foreign
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-31
Value264-45.0720-549.0-126.0228
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:LongtermDebtType

srt:ParentCompany, brka:InsuranceAndOther, us-gaap:SeniorNotes


Foreign
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-553.0-549.0-126.0228-255.0383-106.017093
Percentage of ForeignCurrencyTransactionGainLossBeforeTax0.0100.0100.0100.00.00.00.00.00.0

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:GainLossOnDerivativeInstrumentsNetPretax


Gain
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value70221489-43.0796-1393.0267234213770-603.0137372-206.015308-65.0460
Percentage of GainLossOnDerivativeInstrumentsNetPretax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDerivativeInstrumentsNetPretax us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:EquityContract, us-gaap:Nondesignated


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value481-43.0796-1393.0267234213770-603.0137372-206.0
Percentage of GainLossOnDerivativeInstrumentsNetPretax0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfOtherInvestments

us-gaap:GainLossOnSaleOfOtherInvestments


Gain
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value0.012132517-552.0-4.0-121.0112.012-3.04.0
Percentage of GainLossOnSaleOfOtherInvestments0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillAcquiredDuringPeriod

us-gaap:GoodwillAcquiredDuringPeriod


Goodwill
Period End2021-03-312020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value7.0151595254016617246412361477
Percentage of GoodwillAcquiredDuringPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillAndIntangibleAssetImpairment us-gaap:ConsolidationItems

us-gaap:GoodwillAndIntangibleAssetImpairment

us-gaap:MaterialReconcilingItems


Goodwill
Period End2020-12-312020-09-302020-06-30
Value-12.0-25.0-10634.0
Percentage of GoodwillAndIntangibleAssetImpairment100.0100.0100.0

us-gaap:GoodwillAndIntangibleAssetImpairment us-gaap:ProductOrService

brka:InsuranceAndOther


Goodwill
Period End2020-12-312020-09-302020-06-30
Value122510634
Percentage of GoodwillAndIntangibleAssetImpairment-100.0-100.0-100.0

us-gaap:GoodwillAndIntangibleAssetImpairment us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:TheKraftHeinzCompany


Goodwill
Period End2020-09-302020-06-302019-09-302019-06-30
Value40026000.0500
Percentage of GoodwillAndIntangibleAssetImpairment-1600.0-24.40.00.0

us-gaap:GoodwillImpairmentLoss

us-gaap:GoodwillImpairmentLoss


Goodwill
Period End2020-12-312020-09-302020-06-30
Value122510000
Percentage of GoodwillImpairmentLoss100.0100.0100.0

us-gaap:GoodwillTranslationAndPurchaseAccountingAdjustments

us-gaap:GoodwillTranslationAndPurchaseAccountingAdjustments


Goodwill
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-145.045-46.014813087-238.043-104.0-8.036-428.04.0-212.02730124148-75.0-540.0-29.0-92.0-211.0-159.0-229.0118-299.0-143.0-191.01417-134.056
Percentage of GoodwillTranslationAndPurchaseAccountingAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value377147251393290-257.0300240644124168-3211.03163274012138252309239252225206240
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Income
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value377147251393290-257.0300240644124168-3211.0316327401
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:BerkadiaCommercialMortgageLLCPilotTravelCentersLLCAndElectricTransmissionTexasLLC


Income
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value183154101118131183199192177147167154148125136-56.053
Percentage of IncomeLossFromEquityMethodInvestments48.5104.840.230.045.2-71.266.380.027.5118.599.4-4.846.838.233.9-2.621.0

brka:TheKraftHeinzCompany


Income
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value194-7.015027515944010126239-3365.01682022652138252
Percentage of IncomeLossFromEquityMethodInvestments51.5-4.859.870.054.8-171.233.710.837.1104.853.261.866.1100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxes

us-gaap:IncreaseDecreaseInIncomeTaxes


Increase
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value12751692324699456868564-14049.0645557027855371-7748.02779813-801.0-27550.0700442145144317791325497-236.031911151161222059745851141948658115179398677-401.0104846942541718215911058-884.0583
Percentage of IncreaseDecreaseInIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve


Increase
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value2452139696133923401557583283512201254778117713488556924124540117516900175784631514541067525784-114.06736132
Percentage of IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value649512397-564.0913-380.01140-408.0317111299044421486881378327621339-155.057378-501.0-657.0745228174-180.04841123-32.0
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities


Increase
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value25921197-1861.09302744-315.0171079470441-1800.01197850347-392.0834249864-753.01767298-329.0683105941665225-226.0651660-6.0
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value198513853440-1614.01338-198.02083-1315.05248572237-1338.0136812272186-900.012824111197-143.07297291987-1371.03546032064-1171.02464002415-1394.0179-1295.01475-149.0194-478.02043-688.0-134.0-756.02737-1316.0604-322.03013
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInUnearnedPremiums

us-gaap:IncreaseDecreaseInUnearnedPremiums


Increase
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1583-15.02390-957.01276-738.02006-956.0658-49.02054-1180.0721-99.02352-492.04231.01829-938.0462-32.01476-919.0932-288.01667-823.03701151497-913.0278-152.01306-1002.0414-356.02078-747.019-89.01669-1058.0118-224.01274
Percentage of IncreaseDecreaseInUnearnedPremiums100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaid us-gaap:ProductOrService

us-gaap:InterestPaid

brka:InsuranceAndOther


Interest
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value3412994001093011824091323391453954342131263381243578430656246
Percentage of InterestPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy


Interest
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value755840740832736696742730779687683738727655747717701673737658724
Percentage of InterestPaid221.4280.9185.0763.3244.5382.4181.4553.0229.8473.8172.9170.0341.3519.8221.0578.2196.4801.2240.81175.0294.3

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 us-gaap:ProductOrService

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance


Liability
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value6871519232146193505334633175633854204601312359175142424130915886488339782678
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 us-gaap:ProductOrService

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance


Liability
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3907471564543603410443146841367537244359588439362935382247592555269930374216
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss us-gaap:ProductOrService

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance


Liability
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value150-125.094-356.0-202.0-294.0372-155.018178-81.02146.0364-253.0-51.0-276.0-250.0-77.0
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 us-gaap:FairValueByAssetClass, us-gaap:ReinsurancePolicyType

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

brka:DeferredChargesReinsuranceAssumed, brka:RetroactiveReinsurance


Liability
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value236221252571181295259-388.0275197273347279277271-1706.025233-5783.0
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType

brka:UnpaidLossesAndLossAdjustmentExpenses, brka:RetroactiveReinsurance


Liability
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-6.084-5.0-530.01070.0241343-2.01732.0298-1.0-5.0-30.02160755-1.016050
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1-2.538.0-2.0-92.859.10.09.3-346.1-0.787.80.785.9-0.4-1.8-11.1-126.63020.0-0.4-277.5

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 us-gaap:ProductOrService

brka:InsuranceAndOther


Liability
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value139391217510964112391166710066109791275510858106691017411610993294018963944112137874718566
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims15906.45509.04350.81968.36445.93412.24239.0-3287.43948.45415.73726.73345.83559.93393.93307.4-553.448548.03754.1-321.0

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance


Liability
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value137091187010717111981137997711069611800105851029998991096596549129872289871135785158299
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims15808.95371.04252.81961.16286.73312.24129.7-3041.23849.15227.93626.03159.93460.23295.73218.5-526.845428.03654.5-143.5

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 us-gaap:ReinsurancePolicyType

brka:RetroactiveReinsurance


Liability
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value23030524741288295283955273370275645278272241454
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims197.5138.098.07.2159.1100.0109.3-246.199.3187.8100.7185.999.698.288.9-26.6

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest us-gaap:CounterpartyName, us-gaap:Ownership

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest

brka:HaslamFamily, brka:PilotTravelCentersLLC


Limited
Period End2021-09-302021-06-302021-03-31
Value0050.1
Percentage of LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest0.00.0100.0

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest us-gaap:CounterpartyName, us-gaap:Ownership

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest

brka:ThirdParty, brka:PilotTravelCentersLLC


Limited
Period End2021-09-302021-06-302021-03-312017-10-03
Value0011.30.113
Percentage of LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest0.00.0100.0100.0

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest us-gaap:CounterpartyName, us-gaap:Ownership, us-gaap:OtherCommitments

brka:HaslamFamily, brka:PilotTravelCentersLLC, brka:AgreementToAcquireAdditionalInterest


Limited
Period End2021-09-302021-06-302021-03-312017-10-03
Value0020.00.2
Percentage of LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest0.00.0177.0177.0

us-gaap:NonoperatingGainsLosses

us-gaap:NonoperatingGainsLosses


Nonoperating
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-31
Value49212739457003158240085-70275.0
Percentage of NonoperatingGainsLosses100.0100.0100.0100.0100.0100.0

us-gaap:NonoperatingGainsLosses us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Nonoperating
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-31
Value49212739457003158240085-70275.0
Percentage of NonoperatingGainsLosses100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLeaseIncome

us-gaap:OperatingLeaseLeaseIncome


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value15651447132413041316116114281491143814911436
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLeaseIncome us-gaap:ProductOrService

brka:InsuranceAndOther


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value156514471324130413161161142814911438149114361354147414701434
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:OperatingLeaseLeaseIncomeLeasePayments

us-gaap:OperatingLeaseLeaseIncomeLeasePayments


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value11511105106210571047106210961126109711181074
Percentage of OperatingLeaseLeaseIncomeLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseVariableLeaseIncome

us-gaap:OperatingLeaseVariableLeaseIncome


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value41434226224726999332365341373362
Percentage of OperatingLeaseVariableLeaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease

us-gaap:OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease


Operating
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value291288282300301307292301301293286285274268275
Percentage of OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-643.0312-285.01361791586-1454.0857-700.0-17.0183-689.0-79.0-1364.0601237771798558-1383.0-44.0-607.0493-432.0-716.0577-1360.0-1186.0-1226.035426222549-203.0-650.0148446-537.0219
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-6.0113.0313.010.0-47.031-6.00.03.0-16.0-9.0-43.06.0-21.0242369-43.0-9.0-44.0301311-4.023-152.0-101.077-7.03.056-42.0-51.00.016-6.0-1.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-615.0351-327.0947777754-1478.0165-730.0492883269-1736.078631873-5325.0-738.0118538593874-6457.01513
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

brka:OtherAccumulatedOtherComprehensiveIncome


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3213-3.0-28.01221-48.0-14.012-29.0-12.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-5.23.70.9-3.01.52.83.2-8.5-1.6-59.2-4.2

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value393340-343.0-16.01271-586.0-34.01750
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-6.39.4-12.2-36.2-2.11.6-4.8-355.24.734.717.4

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-68.09.0-67.02615153-139.0-26.0-29.07393
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent11.12.620.52.71.920.39.4-15.84.0149.032.3

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-618.0296-297.01292766568-1362.0791-679.0-12.0157
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.584.390.8136.498.675.392.2479.493.0-24.554.5

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-54.0-43.0-61.044124-15.0-95.075845-26.0-66.062113-87.024-282.03.04410.0-320.021-51.0-4.0-172.0-247.044-49.01733-39.016-7.0-2507.017-25.0-87.0422.0-37.0-12.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-13.0-9.0-20.0888.0-1.0-21.01717.0-6.0-17.03.0-20.017-76.06.0187.0-181.013-19.0-53.0-85.013626-7.05.0-924.04.0-7.0-23.0-7.0-3.0-10.0-6.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value20-2.020-6.0-4.0-50.0412.012-22.0-1.0-10.07.010.046582269910767110804.06321935553632115-146.0843364459126951769125237
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeOtherNetOfTax

us-gaap:OtherComprehensiveIncomeOtherNetOfTax


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value3813-6.0-23.01624-59.0-13.010.0-32.0-13.045-21.0-5.0-31.0-47.0323.03.0-14.03.016-22.010.0-4.025-125.0352.0-25.0-4.072464.016-30.0171.0-20.0
Percentage of OtherComprehensiveIncomeOtherNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-89.012-87.03219203-180.0-28.01897117-53.05.0-92.0-45.012410495247118377152391581-271.0-2691.03665-8623.0234-3796.01202-601.026392591124611598141196418125034-1788.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherExpenses us-gaap:ProductOrService

us-gaap:OtherExpenses

brka:RailroadUtilitiesAndEnergy


Other
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value15821563109313741481109284910121162117565391910941133749
Percentage of OtherExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value750-258.0225-414.0-11086.0566-486.01003268469-3634.02564201.0652-707.0-283.0-120.0188-99.0327-255.0-131.0-460.0-226.066-28.012013236610-533.0-202.0-248.0-154.0-213.0-166.0-262.0-437.0-225.0-28.0-121.0-52.0-100.0-5.0-98.0
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense dei:LegalEntity, us-gaap:CounterpartyName, us-gaap:ReinsurancePolicyType

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

brka:NationalIndemnityCompany, brka:AmericanInternationalGroupInc, brka:RetroactiveReinsurance


Payments
Period End2021-09-30
Value288
Percentage of PaymentsForLossesAndLossAdjustmentExpense100.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType

brka:UnpaidLossesAndLossAdjustmentExpenses, brka:RetroactiveReinsurance


Payments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value510532276290158432196266183257203399179224563216153195435
Percentage of PaymentsForLossesAndLossAdjustmentExpense177.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense us-gaap:ProductOrService

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance


Payments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1077899079668979691577777100161001391448960900798538077806378508441758270156894
Percentage of PaymentsForLossesAndLossAdjustmentExpense3742.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-964.0-92.0-449.01897970796-81.0429109044-67.0328-31.0-379.0153349286-3.0115-192.02147.0390-144.020-34.0-7.054-128.0-48.0-214.0-316.0-644.0945122568-221.0-317.0653-48.06443-122.0-327.0662-69.0210
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:PaymentsToAcquireBusinessesGross

brka:BerkshireHathawayEnergyCompany, brka:DominionEnergyInc, us-gaap:SubsequentEvent, brka:FirstAcquisitionAgreement


Payments
Period End2020-10-05
Value2700
Percentage of PaymentsToAcquireBusinessesGross100.0

brka:BerkshireHathawayEnergyCompany, brka:DominionEnergyInc, us-gaap:SubsequentEvent, brka:SecondAcquisitionAgreement


Payments
Period End2020-10-05
Value1300
Percentage of PaymentsToAcquireBusinessesGross48.1

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:ConsolidatedEntities, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement

brka:BerkshireHathawayEnergyCompany, brka:DominionEnergyInc, brka:FirstAcquisitionAgreement


Payments
Period End2020-11-01
Value2500
Percentage of PaymentsToAcquireBusinessesGross0.0

brka:BerkshireHathawayEnergyCompany, brka:DominionEnergyInc, brka:SecondAcquisitionAgreement


Payments
Period End2021-06-30
Value1300
Percentage of PaymentsToAcquireBusinessesGross0.0

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:ConsolidatedEntities, us-gaap:StatementScenario, us-gaap:BusinessAcquisition, us-gaap:TypeOfArrangement

brka:BerkshireHathawayEnergyCompany, srt:ScenarioForecast, brka:DominionEnergyInc, brka:SecondAcquisitionAgreement


Payments
Period End2021-06-30
Value1300
Percentage of PaymentsToAcquireBusinessesGross0.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired


Payments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1005747242129562695115231826227581482611126891912215995843752553018510030250539953755393-24.070056016766292
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireLoansReceivable

us-gaap:PaymentsToAcquireLoansReceivable


Payments
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value144511153111359518-134.0177142316674041434212985283361317535871839192183584412026957104752402314210447410371086162235982
Percentage of PaymentsToAcquireLoansReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockDividendRatePercentage us-gaap:Ownership, us-gaap:InvestmentType, us-gaap:OtherCommitments

us-gaap:PreferredStockDividendRatePercentage

brka:OccidentalPetroleumCorporation, brka:CumulativePerpetualPreferredStock, brka:InvestmentCommitment


Preferred
Period End2021-09-302021-06-302021-03-312019-08-08
Value008.08.0
Percentage of PreferredStockDividendRatePercentage0.00.0100.0100.0

us-gaap:ProceedsFromCollectionOfLoansReceivable

us-gaap:ProceedsFromCollectionOfLoansReceivable


Proceeds
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value651091091251128670868482937678881001031206296972199794801479911712911511215750189235261696166732741512321891205128912431889192174
Percentage of ProceedsFromCollectionOfLoansReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-416.0-207.0-132.0-233.018-55.0-159.0-156.0-62.010.0-289.0-66.0-24.0-151.0-102.0-13.0-16.0-69.0-23.014016-70.02620-68.0-46.0-67.0-16.041-17.0144112-180.0-7.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


Provision
Period End2021-09-302021-06-302021-03-312020-09-302020-06-302020-03-31
Value1261911825213211
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanLossesExpensed

us-gaap:ProvisionForLoanLossesExpensed


Provision
Period End2021-09-302021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1622270.047448616433432
Percentage of ProvisionForLoanLossesExpensed100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfDebt dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

us-gaap:RepaymentsOfDebt

brka:BerkshireHathawayEnergyCompanyAndSubsidiaries, srt:Subsidiaries, brka:RailroadUtilitiesAndEnergy


Repayments
Period End2021-03-312020-03-31
Value4761700
Percentage of RepaymentsOfDebt100.0100.0

us-gaap:RepaymentsOfDebt dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

brka:BerkshireHathawayFinanceCorporation, srt:Subsidiaries, brka:InsuranceAndOther, brka:NotesDueTwoThousandFiftyOneAtTwoPointFivePercent, us-gaap:SeniorNotes


Repayments
Period End2021-03-31
Value750
Percentage of RepaymentsOfDebt157.6

brka:BurlingtonNorthernSantaFeCorporation, srt:Subsidiaries, brka:RailroadUtilitiesAndEnergy, brka:DebenturesDueTwoThousandFiftyOne, us-gaap:UnsecuredDebt