CINF


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

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued
us-gaap:StatementEquityComponents
us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:BenefitsLossesAndExpenses

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense
us-gaap:StatementBusinessSegments

us-gaap:GainLossOnInvestments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:InsuranceCommissionsAndFees
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:InterestExpense

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetInvestmentIncome
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherIncome
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet
us-gaap:StatementBusinessSegments

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

us-gaap:RealizedInvestmentGainsLosses
us-gaap:InvestmentType

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

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

us-gaap:Assets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments

us-gaap:Liabilities
us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:Restatement, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
us-gaap:ConsolidatedEntities

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidatedEntities
us-gaap:BusinessAcquisition
us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:OtherAssets
us-gaap:ConsolidatedEntities

us-gaap:LongTermDebt
us-gaap:DebtInstrument

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:Restatement, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock
us-gaap:ConsolidatedEntities

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities
us-gaap:Restatement, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValue
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:BusinessAcquisition

cinf:Covid19PandemicRelatedIncurredLossAndExpenses
us-gaap:RetirementPlanType
cinf:DefinedBenefitPlanNonServiceCostBenefit
us-gaap:StatementEquityComponents
cinf:IncreaseDecreaseInOtherComprehensiveIncomeLossBeforeTax
us-gaap:StatementEquityComponents
cinf:IncreaseDecreaseInOtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
cinf:IncreaseDecreaseInOtherComprehensiveIncomeLossTax

cinf:IncreaseDecreaseinPremiumsandReinsurancereceivable
us-gaap:BusinessAcquisition
cinf:IncreaseDecreaseofdeferredtaxassets

cinf:InvestmentIncomeOtherLongTermInvestments
us-gaap:InvestmentType
cinf:NumberOfImpairedSecuritiesIntendedtobeSold

cinf:OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax

cinf:OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax
us-gaap:StatementEquityComponents
cinf:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentBeforeTax
us-gaap:StatementEquityComponents
cinf:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentNetOfTax
us-gaap:StatementEquityComponents
cinf:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentTax
us-gaap:StatementEquityComponents
cinf:OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentBeforeTax
us-gaap:StatementEquityComponents
cinf:OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentNetOfTax
us-gaap:StatementEquityComponents
cinf:OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentTax

cinf:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodTax
us-gaap:InvestmentType
cinf:OtherRealizedInvestmentGainsLossesNet

cinf:PurchaseOfTreasurySharesNonCash
us-gaap:StatementEquityComponents
cinf:ReclassificationfromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax
us-gaap:StatementEquityComponents
cinf:SharesAcquiredDuringPeriodValueEmployeeShareBasedCompensationPlans

cinf:UnderwritingAcquisitionAndInsuranceExpenses
us-gaap:InvestmentType
cinf:WritedownofImpairedSecuritiesIntendedtobeSold

us-gaap:AdditionsToContractHoldersFunds
us-gaap:StatementBusinessSegments
us-gaap:AssumedPremiumsEarned
us-gaap:StatementBusinessSegments
us-gaap:AssumedPremiumsWritten
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesGrossRealizedGains
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses

us-gaap:CapitalLeaseObligationsIncurred

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
us-gaap:StatementBusinessSegments
us-gaap:CededPremiumsEarned
us-gaap:StatementBusinessSegments
us-gaap:CededPremiumsWritten
us-gaap:StatementEquityComponents
us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CurrentIncomeTaxExpenseBenefit

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseOther
us-gaap:StatementBusinessSegments

us-gaap:DeferredPolicyAcquisitionCostsAdditions
us-gaap:StatementBusinessSegments
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanOtherCosts
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DefinedContributionPlanEmployerDiscretionaryContributionAmount

us-gaap:DepreciationAmortizationAndAccretionNet
us-gaap:StatementBusinessSegments
us-gaap:DirectPremiumsEarned
us-gaap:StatementBusinessSegments
us-gaap:DirectPremiumsWritten
us-gaap:StatementEquityComponents
us-gaap:DividendsCommonStockCash

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsDividends

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments

us-gaap:EffectiveIncomeTaxRateReconciliationTaxExemptIncome

us-gaap:GainLossOnSaleOfInvestments
us-gaap:InvestmentType

us-gaap:GrossInvestmentIncomeOperating

us-gaap:IncomeTaxReconciliationDeductionsDividends

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

us-gaap:IncomeTaxReconciliationOtherAdjustments

us-gaap:IncomeTaxReconciliationTaxExemptIncome

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities
us-gaap:StatementBusinessSegments
us-gaap:IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities

us-gaap:IncreaseDecreaseInUnearnedPremiums
us-gaap:AwardType
us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestCreditedToPolicyOwnerAccount

us-gaap:InvestmentIncomeDividend

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInvestmentExpense

us-gaap:LiabilitiesAssumed1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherCostAndExpenseOperating

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesEquity

us-gaap:PaymentsToAcquireFinanceReceivables
us-gaap:StatementBusinessSegments
us-gaap:PolicyholderBenefitsAndClaimsIncurredGross
us-gaap:StatementBusinessSegments
us-gaap:PremiumsEarnedNetLife

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfNotesPayable

us-gaap:ProceedsFromSaleAndCollectionOfFinanceReceivables

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesEquity

us-gaap:ProceedsFromStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementBusinessSegments
us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed
us-gaap:StatementBusinessSegments
us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:StockholdersEquityOther

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:Range, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockSharesAcquired
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:InvestmentType
us-gaap:UnrealizedGainLossOnInvestments
us-gaap:BusinessAcquisition
us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount

us-gaap:WithdrawalFromContractHoldersFunds
us-gaap:Restatement, us-gaap:StatementEquityComponents
cinf:AccumulatedOtherComprehensiveIncomeLossTax
us-gaap:StatementEquityComponents
us-gaap:Range
cinf:AsbestosAndEnvironmentalReinsuranceRetention

cinf:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAverage

cinf:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAverage

cinf:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAverage

cinf:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAverage

cinf:AvailableForSaleSecuritiesEquitySecuritiesCost
us-gaap:ConsolidatedEntities
us-gaap:FinancialInstrument, us-gaap:InvestmentType
cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLoss3
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss3
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLoss3
us-gaap:InvestmentType

cinf:DeferredTaxLiabilitiesPolicyLiabilitiesLife

cinf:DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments

cinf:ExcessofSeparateAccountFairValueoverAccountValue

cinf:LargestSingleCommonStockHolding

cinf:Largestequityholdingstototalequityportfolio

cinf:Largestequityholdingstototalportfolio
us-gaap:InvestmentType
cinf:NumberOfSecuritiesContinuousUnrealizedLossPosition
us-gaap:MajorCustomers
cinf:PercentageOfPremiums
us-gaap:MajorCustomers, us-gaap:Range
us-gaap:Range, us-gaap:StatementGeographical
us-gaap:StatementGeographical

cinf:PercentageOfReservesForAsbestosAndEnvironmentalClaims

cinf:PremiumReceivableAllowanceForCreditLossPropertyCasualtyPremiumsReceivable

cinf:ReinsuranceRecoverable
us-gaap:AwardType, us-gaap:DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensation
cinf:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValueAggregate

dei:EntityCommonStockSharesOutstanding

srt:LifeInsuranceInForceCeded

srt:LifeInsuranceInForceGross

srt:LifeInsuranceInForceNet
us-gaap:RetirementPlanType
us-gaap:AccruedEmployeeBenefitsCurrentAndNoncurrent

us-gaap:AccruedInvestmentIncomeReceivable
us-gaap:ConsolidatedEntities
us-gaap:Restatement, us-gaap:StatementEquityComponents
us-gaap:AccumulatedOtherComprehensiveIncomeLossBeforeTax1
us-gaap:StatementEquityComponents

us-gaap:AssetsHeldByInsuranceRegulators

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:ConsolidatedEntities
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:InvestmentType

us-gaap:AvailableForSaleEquitySecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecurities
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesAmortizedCost
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesEquitySecurities
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DebtInstrumentFairValue
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DeferredIncomeTaxLiabilities
us-gaap:ConsolidatedEntities

us-gaap:DeferredPolicyAcquisitionCosts
us-gaap:StatementBusinessSegments

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsForeign

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve

us-gaap:DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost

us-gaap:DeferredTaxLiabilitiesInvestments

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanAmountOfEmployerAndRelatedPartySecuritiesIncludedInPlanAssets

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:Range, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:SubsidiarySaleOfStock
us-gaap:DefinedBenefitPlanNumberOfSharesOfEquitySecuritiesIssuedByEmployerAndRelatedPartiesIncludedInPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:InvestmentType
us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations
us-gaap:EquitySecuritiesByIndustry, us-gaap:InvestmentType
us-gaap:InvestmentType
us-gaap:ConsolidatedEntities
us-gaap:DividendsPayableCurrentAndNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:DueFromAffiliates

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:ConsolidatedEntities
us-gaap:EquityMethodInvestments

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:Investments
us-gaap:ConsolidatedEntities

us-gaap:InvestmentsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LiabilitiesRelatedToInvestmentContractsFairValueDisclosure
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:LiabilityForAsbestosAndEnvironmentalClaimsNet

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability

us-gaap:LiabilityForFuturePolicyBenefitsLife
us-gaap:EquitySecuritiesByIndustry
us-gaap:ProductOrService, us-gaap:EquitySecuritiesByIndustry

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LoansAndLeasesReceivableNetReportedAmount
us-gaap:InvestmentType

us-gaap:LoansReceivableFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrument
us-gaap:LongTermDebtFairValue
us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:NotesPayable

us-gaap:NotesPayableFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:BusinessAcquisition
us-gaap:OperatingLossCarryforwards
us-gaap:BusinessAcquisition, us-gaap:GeographicDistribution

us-gaap:OtherInvestmentNotReadilyMarketableFairValue
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RetirementPlanName

us-gaap:OtherInvestments
us-gaap:ConsolidatedEntities
us-gaap:InvestmentType

us-gaap:OtherLiabilities
us-gaap:ConsolidatedEntities

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent

us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts
us-gaap:StatementBusinessSegments

us-gaap:PremiumsReceivableAtCarryingValue

us-gaap:PrepaidReinsurancePremiums
us-gaap:ConsolidatedEntities
us-gaap:PrepaidTaxes

us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:SecuritiesHeldAsCollateralAtFairValue

us-gaap:SeparateAccountAssets
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:SeparateAccountsLiability
cinf:ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAward, us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
cinf:ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAward, us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensation
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
us-gaap:DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensation
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearEight
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFive
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFour
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearNine
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearOne
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSeven
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSix
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTen
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearThree
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTwo
us-gaap:StatementBusinessSegments

us-gaap:ShortdurationInsuranceContractsIncurredClaimsAndAllocatedClaimAdjustmentExpenseNet

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNet
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNetNotSeparatelyPresented
us-gaap:StatementBusinessSegments

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAccumulatedUnallocatedClaimAdjustmentExpense

us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
dei:LegalEntity
us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersDeferredPolicyAcquisitionCosts
us-gaap:StatementBusinessSegments

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersUnearnedPremiums
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts
cinf:SegmentReportingInformationBySecondarySegment
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves
cinf:SegmentReportingInformationBySecondarySegment
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationOtherPolicyClaimsAndBenefitsPayable
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationUnearnedPremiums
cinf:SegmentReportingInformationBySecondarySegment
us-gaap:StatementBusinessSegments

us-gaap:TreasuryStockShares

us-gaap:UnearnedPremiums

us-gaap:ValuationAllowancesAndReservesBalance
us-gaap:ValuationAllowancesAndReservesType

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Interest Expense
Balance Sheet
Long Term Debt
Assets
Property Plant And Equipment Net
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Other Liabilities
Noncurrent Liabilities
Long Term Debt
Stockholders Equity
Common Stock Value
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Treasury Stock Shares
DividendsAndRepurchase
Payments For Repurchase Of Common Stock

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ███████████████████████████████▆▆▄▃▃▁▁▁▁▁▁▁397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0396.0396.0395.0394.0394.0393.0393.0393.0393.0393.0393.0393.0NANANA
us-gaap:CommonStockSharesIssued ███████████████████████████▇▇▇▇▇▇▄▄▄▄▁▁▁▁▁▁198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.3198.0198.0198.0198.0198.0198.0197.0197.0197.0197.0196.0196.0196.0196.0196.0196.0NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock▂▁▁▁▁▁▅▆▅▅▅▄▄▇▇▇▇█▇██▇▇▆▇▇▆▅▇▅▅▇▇▅▅▅▃▃▃▃▅▅▅▅▅▅161.1161.0160.9160.8160.8160.8162.9163.4163.3163.2162.8162.7162.6164.1163.9164.0163.9164.6164.4164.7164.5164.4163.9163.8164.0164.3163.7163.0164.0163.0163.0164.0164.0163.0163.0163.0162.0162.0162.0162.0163.0163.0163.0163.0163.0163.0
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁162.9162.5NA162.0161.5162.2NA165.6165.2164.6NA164.0164.5164.0NA165.9166.0166.5NA166.8166.5166.0NA165.5165.5165.6NA165.0165.1165.0NA165.601165.442164.924NA163.857163.514163.145NA163.086163.069163.67NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁161.1161.0NA160.9160.8162.2NA163.3163.3163.0NA162.7163.2164.0NA164.0164.3164.6NA164.6164.5164.2NA164.0164.1164.0NA163.5163.5163.4NA163.71163.512163.133NA162.555162.425162.277NA162.538163.069162.94NANANANA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▁█0.41.0NA1.42.72.5NA0.00.40.7NA1.11.32.8NA0.60.60.7NA0.00.30.4NA0.30.70.7NA0.70.70.7NA0.3350.342.056NA5.0456.0596.215NA8.597.8586.919NANANANA
us-gaap:EarningsPerShareBasic ▇▇█▆█▁▇▆▆▇▃▆▅▅▇▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅4.363.856.523.015.65-7.563.841.512.624.27-2.783.41.33-0.193.920.620.611.220.611.090.751.140.951.061.070.781.031.120.510.560.750.80.670.951.180.690.20.530.820.12-0.30.380.77999999999999980.950.170.42
us-gaap:EarningsPerShareDiluted ▇▇█▆█▁▇▆▆▇▃▆▅▅▇▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅4.313.826.472.995.63-7.563.791.492.594.22-2.783.381.32-0.193.880.610.61.210.61.080.741.130.941.051.060.771.021.110.510.550.740.790.660.941.170.680.20.530.820.12-0.30.380.780.950.170.42
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cinf:CommercialLinesInsurance█▁912.0887.0NANA871.0864.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cinf:ExcessandSurplusLinesInsurance█▇▇▆▅▅▅▄▃▃▂▂▂▁▁▁▁96.089.088.082.078.079.076.073.067.064.061.060.058.056.056.053.053.0NA47.049.045.0NA44.042.043.0NA39.042.034.0NANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cinf:InvestmentSegmentOfCINF█▁695.0678.0NANA1226.0-1560.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cinf:LifeInsurance█▁80.070.0NANA80.067.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cinf:PersonalLinesInsurance█▁383.0377.0NANA365.0360.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,us-gaap:InvestmentsSegmentNANANA700.01226.0-1560.0705.0247.0524.0820.0-613.0612.0259.0-41.0148.0160.0140.0309.0116.0204.0193.0206.0110.0146.0200.0186.0172.0203.0150.0157.0143.0155.0NANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,us-gaap:LifeInsuranceSegmentNANANA72.080.067.068.071.068.067.066.062.065.061.060.057.061.059.054.060.060.059.054.053.053.054.053.047.054.050.066.039.0NANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,us-gaap:PropertyAndCasualtyCommercialInsuranceProductLineNANANA866.0871.0864.0854.0835.0824.0811.0813.0806.0812.0792.0798.0793.0797.0782.0781.0780.0772.0761.0762.0758.0746.0734.0731.0721.0715.0693.0681.0681.0NANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,us-gaap:PropertyAndCasualtyPersonalInsuranceProductLineNANANA368.0365.0360.0359.0355.0349.0345.0343.0339.0333.0326.0321.0315.0308.0302.0298.0294.0289.0284.0281.0278.0272.0269.0266.0264.0259.0254.0249.0244.0NANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:BenefitsLossesAndExpenses ▆▇▆██▇▆▆▆▅▅▅▅▅▅▅▅▅▄▄▅▄▃▃▄▄▃▃▄▄▃▃▃▂▁▂▃▂▁▂▄▂▁▂▂▁1423.01459.01378.01613.01569.01477.01371.01406.01383.01292.01291.01297.01294.01274.01214.01283.01258.01247.01184.01149.01205.01099.01047.01035.01068.01111.01026.01021.01107.01070.01005.0970.0956.0886.0797.0883.0991.0874.0769.0933.01072.0853.0762.0850.0857.0802.0
us-gaap:ComprehensiveIncomeNetOfTax ▇▆█▆█▁▆▆▆▇▄▆▅▄▇▅▅▅▅▅▅▆▅▅▅▅▅▅▅▅▆▅▅▆▅▅▅▅▆▄▅▅▅▆▅▅809.0476.01132.0573.01302.0-1470.0632.0326.0582.0883.0-426.0494.0157.0-201.0891.0224.0245.0288.041.0218.0306.0375.0220.0-60.0-26.0100.0253.0109.0238.0165.0359.0177.0-31.0387.0150.0272.0-5.0232.0332.0-181.0-2.0148.081.0334.0-59.0166.0
us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense ██████████████████▁███▁███295.0277.0279.0286.0276.0265.0267.0270.0251.0246.0245.0231.0236.0234.0233.0237.0229.0214.0-1511.0222.0214.0212.0-1449.0207.0204.0209.0NANANANANANANANANANANANANANANANANANANANA
us-gaap:GainLossOnInvestments █▁520.0504.0NA533.01060.0-1725.0NA86.0364.0663.0NA458.0105.0-191.0NANANANANANANANANANANANANANANANANANANANANANANANA-5.01.067.012.019.0156.0-22.09.0
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▇▇█▆█▁▇▆▆▇▃▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅872.0768.01316.0614.01145.0-1576.0781.0294.0530.0867.0-581.0618.0264.0-50.0197.0129.0128.0276.0128.0253.0166.0265.0216.0243.0248.0174.0236.0259.0107.0119.0167.0182.0148.0217.0273.0152.029.0112.0186.011.0-97.076.0174.0221.021.085.0
us-gaap:IncomeTaxExpenseBenefit ▇▇█▇█▂▇▆▆▇▄▆▆▅▁▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▅▆▆▅▅▆▆▆▅▆169.0148.0267.0130.0236.0-350.0155.046.0102.0172.0-129.065.047.0-19.0-445.027.028.075.028.073.043.077.060.069.072.046.069.076.023.028.045.051.038.063.081.041.0-3.026.052.0-8.0-48.014.048.065.0-6.017.0
us-gaap:IncomeTaxesPaidNet ▁█47.066.0NA11.031.00.091.0-10.0-81.094.0-82.022.060.00.0-26.021.023.00.0-150.042.0111.0-1.0-178.096.072.011.0NANANANANANANANANANANANANANANANANANANANA
us-gaap:InsuranceCommissionsAndFees █▄▄▁▄▄██▄██▄█4.03.03.02.03.03.04.04.03.04.04.03.04.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestExpense ▁▁█▁█▁▁█▁▁▁█▁▁█▁▁▁█▁▁▁▁█▁▁▁▁▁██▁█▁▁█▁██▁█▁█▁▁█13.013.014.013.014.013.013.014.013.013.013.014.013.013.014.013.013.013.014.013.013.013.013.014.013.013.013.013.013.014.014.013.014.013.013.014.013.014.014.013.014.013.014.013.013.014.0
us-gaap:InterestPaidNet NANA26.00.0NANA26.00.0NANA26.01.026.00.026.00.026.00.026.00.0NANA26.00.0NANA26.01.026.00.026.00.027.00.026.01.027.00.026.00.0NANA26.00.0NANA
us-gaap:NetIncomeLoss ▇▇█▆█▁▇▆▆▇▃▆▅▅▇▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅703.0620.01049.0484.0909.0-1226.0626.0248.0428.0695.0-452.0553.0217.0-31.0642.0102.0100.0201.0100.0180.0123.0188.0156.0174.0176.0128.0167.0183.084.091.0122.0131.0110.0154.0192.0111.032.086.0134.019.0-49.062.0126.0156.027.068.0
us-gaap:NetInvestmentIncome ███▇▇▇▇▆▆▅▆▅▅▄▅▅▄▄▅▄▄▄▄▃▃▃▃▂▂▂▂▂▁▁▂▂▂▁▂▁▂▁▁▁▁▁175.0174.0172.0167.0166.0165.0168.0161.0160.0157.0161.0154.0154.0150.0156.0153.0151.0149.0153.0148.0149.0145.0150.0143.0140.0139.0140.0138.0136.0135.0137.0133.0131.0128.0136.0132.0132.0131.0132.0130.0132.0131.0130.0128.0130.0130.0
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▂▅▅█▁▄▅▅▆▄▃▃▂▆▅▅▅▃▄▆▆▄▁▁▃▅▃▅▄▆▄▂▆▃▅▃▅▆▁▄106.0-144.083.089.0393.0-244.06.078.0154.0188.026.0-59.0-60.0-170.0249.0122.0145.087.0-59.038.0183.0187.064.0-234.0-202.0-28.086.0-74.0154.074.0237.046.0-141.0233.0-42.0161.0-37.0146.0198.0-200.048.0NANANANANA
us-gaap:OtherIncome █▆▆██▆▆█▆▆▃▆▃▃▃▆▃▃▁▆▆▃▆▃▆▆▃█▆▆▆█▆▆▆██▆▆█▆███▆▆3.02.02.03.03.02.02.03.02.02.01.02.01.01.01.02.01.01.00.02.02.01.02.01.02.02.01.03.02.02.02.03.02.02.02.03.03.02.02.03.02.03.03.03.02.02.0
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet ▆▇▅█▇▇▆▆▆▅▅▅▅▅▄▅▅▅▄▄▅▄▃▃▃▄▃▃▄▄▃▃▃▂▁▂▃▂▁▃▄▂▁▂▂▁915.01003.0902.01143.01086.01003.0910.0932.0936.0860.0874.0879.0883.0854.0809.0874.0854.0853.0809.0753.0821.0724.0677.0670.0712.0749.0675.0686.0763.0732.0664.0642.0631.0568.0482.0571.0687.0582.0492.0656.0801.0575.0494.0575.0595.0516.0
us-gaap:PremiumsEarnedNet ██▇▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁1593.01544.01520.01522.01482.01456.01441.01446.01384.01333.01318.01298.01294.01260.01258.01247.01241.01208.01192.01191.01173.01154.01148.01127.01111.01094.01086.01071.01059.01027.01025.0992.0954.0931.0917.0889.0877.0839.0827.0812.0773.0782.0783.0784.0768.0746.0
us-gaap:RealizedInvestmentGainsLosses ▇▇█▇█▁▇▆▆▇▃▆▆▅▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▆▅▅▆▅▅520.0504.0997.0533.01060.0-1725.0537.086.0364.0663.0-774.0458.0105.0-191.0-8.07.0-11.0160.0-37.056.044.061.0-40.03.060.047.032.065.014.022.06.022.014.041.013.010.06.013.0-7.0-2.067.012.019.0155.0-23.08.0
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▇▇█▇█▁▇▅▆▇▃▆▅▄▅▅▅▅▅▅▅▅▄▄▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃2295.02227.02694.02227.02714.0-99.02152.01700.01913.02159.0710.01915.01558.01224.01411.01412.01386.01523.01312.01402.01371.01364.01263.01278.01316.01285.01262.01280.01214.01189.01172.01152.01104.01103.01070.01035.01020.0986.0955.0944.0975.0929.0936.01071.0878.0887.0
us-gaap:Revenues ▇▇█▇█▁▇▅▆▇▃▆▅▄▅▅▅▅▅▅▅▅▄▄▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃2295.02227.02694.02227.02714.0-99.02152.01700.01913.02159.0710.01915.01558.01224.01411.01412.01386.01523.01312.01402.01371.01364.01263.01278.01316.01285.01262.01280.01214.01189.01172.01152.01104.01103.01070.01035.01020.0986.0955.0944.0975.0929.0936.01071.0878.0887.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets █▇▇▆▆▅▆▆▅▅▄▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁29677.028313.027542.026370.025450.023367.025408.024742.024337.023352.021935.022480.021760.021470.021843.021592.021238.020753.020386.020455.020151.019447.018888.018751.018888.018897.018753.018474.018335.017942.017662.017339.017034.017037.016548.016479.016089.016022.015668.015412.015702.015369.015095.0NANANA
us-gaap:Liabilities █▇▇▇▇▆▆▆▆▅▅▅▄▄▄▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▂▂▁▁17819.017175.016753.016625.016192.015325.015544.015371.015206.014722.014102.014146.013844.013524.013600.014069.013865.013497.013326.013334.013180.012712.012461.012401.012391.012289.012180.012098.011992.011774.011592.011523.011335.011252.011095.011120.010945.010815.010613.010626.010645.010251.010063.0NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇▇▆▆▅▆▆▅▅▄▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁29677.028313.027542.026370.025450.023367.025408.024742.024337.023352.021935.022480.021760.021470.021843.021592.021238.020753.020386.020455.020151.019447.018888.018751.018888.018897.018753.018474.018335.017942.017662.017339.017034.017037.016548.016479.016089.016022.015668.015412.015702.015369.015095.0NANANA
us-gaap:StockholdersEquity █▇▇▆▅▄▆▆▅▅▄▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁11858.011138.010789.09745.09258.08042.09864.09371.09131.08630.07833.08334.07916.07946.08243.07523.07373.07256.07060.07121.06971.06735.06427.06350.06497.06608.06573.06376.06343.06168.06070.05816.05699.05785.05453.05359.05144.05207.05055.04786.05057.05118.05032.05010.04737.04865.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CashAndCashEquivalentsAtCarryingValue █▇▇▇▅▃▆▆▆▆▆▄▃▄▅▅▄▄▆▅▄▄▄▂▃▅▄▂▃▃▃▃▂▂▃▂▁▃▃▁▁▂▂▃▂▂1003.0947.0900.0914.0706.0486.0767.0787.0803.0802.0784.0616.0521.0604.0657.0674.0606.0543.0777.0700.0547.0613.0544.0419.0487.0640.0591.0412.0462.0521.0433.0511.0382.0380.0487.0416.0263.0424.0438.0308.0313.0379.0385.0445.0325.0402.0
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents █▇▇▇▄▁▅▅▅▅▅1003.0947.0900.0914.0706.0486.0767.0787.0803.0802.0784.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▅█████▇▇▇▇▇▆▆▆▆▆▆▆▅▅▅▅▅293.0290.0285.0283.0280.0281.0276.0269.0267.0265.0265.0259.0264.0259.0253.0251.0245.0242.0237.0234.0367.0465.0459.0452.0457.0452.0446.0439.0431.0424.0420.0412.0405.0398.0397.0390.0390.0383.0376.0368.0377.0368.0352.0NANANA
us-gaap:PropertyPlantAndEquipmentNet ▅▅▅▄▄▄▄▄▄▃▃▂▂▂▁▂▁▁▁▁▂▂▁▂▂▂▂▃▃▄▄▄▅▅▅▆▆▇▆▆▇█▆213.0213.0213.0211.0209.0208.0207.0207.0207.0202.0195.0191.0188.0186.0185.0186.0184.0181.0183.0184.0186.0188.0185.0188.0187.0189.0194.0198.0203.0207.0210.0211.0213.0216.0217.0223.0229.0235.0227.0228.0234.0243.0229.0NANANA
 us-gaap:DeferredTaxAssetsLiabilitiesNet us-gaap:BusinessAcquisition cinf:CincinnatiGlobalUnderwritingLtd.NANA56.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredTaxAssetsLiabilitiesNet us-gaap:BusinessAcquisition cinf:MSPUnderwritingLimited▁█52.055.0NA54.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LongTermDebt ▅▄▄▄▄▄▄▄▄▄▄▂▂▂▂▂▂▂▂▁▁▁▁████▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇789.0788.0788.0788.0788.0788.0788.0788.0788.0788.0788.0787.0787.0787.0787.0787.0787.0787.0787.0786.0786.0786.0786.0791.0791.0791.0791.0790.0790.0790.0790.0790.0790.0790.0790.0790.0790.0790.0790.0790.0790.0790.0790.0NANANA
us-gaap:LongTermDebtAndCapitalLeaseObligations ██▇▇▇▇▇██▇▄▃▃▃▃▂▂▂▂▃▂▂▁▂▂▂▃▃▄▄▅▄▄▄▃▃▄▄▁848.0848.0845.0844.0845.0846.0846.0847.0847.0845.0834.0830.0828.0829.0827.0826.0826.0825.0826.0827.0825.0825.0821.0826.0823.0825.0827.0829.0831.0834.0835.0832.0833.0831.0827.0828.0831.0833.0821.0NANANA807.0NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet NANA1299.0NANANA1079.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA2.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA2.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA2.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA1.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA2.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity █▇▇▆▅▄▆▆▅▅▄▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁11858.011138.010789.09745.09258.08042.09864.09371.09131.08630.07833.08334.07916.07946.08243.07523.07373.07256.07060.07121.06971.06735.06427.06350.06497.06608.06573.06376.06343.06168.06070.05816.05699.05785.05453.05359.05144.05207.05055.04786.05057.05118.05032.05010.04737.04865.0
us-gaap:CommonStockValue ███████████████████████████████▆▆▄▃▃▁▁▁▁▁▁▁397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0397.0396.0396.0395.0394.0394.0393.0393.0393.0393.0393.0393.0393.0NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ████▇▇▇▇▇▆▆▆▆▆▆▆▆▅▆▅▅▅▅▅▅▄▅▄▄▄▄▃▃▃▂▂▁▁▁▁▁▁▁1334.01322.01328.01318.01309.01300.01306.01295.01286.01277.01281.01273.01266.01258.01265.01256.01249.01243.01252.01244.01237.01230.01232.01223.01216.01210.01214.01205.01198.01191.01191.01177.01162.01146.01134.01119.01106.01100.01096.01098.01094.01090.01091.0NANANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▇▆▆▅▆▆▅▅▅▅▅▅▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁11205.010603.010085.09132.08745.07932.09257.08722.08566.08229.07625.08164.07696.07565.05180.05193.05174.05156.05037.05016.04915.04871.04762.04756.04658.04557.04505.04409.04299.04287.04268.04214.04152.04109.04021.03896.03851.03884.03885.03816.03862.03977.03980.0NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▃▃▃▃▃▂▂▂▂▂▁▁▁▁█▆▆▅▅▅▅▅▄▄▅▅▅▅▅▅▅▄▄▄▄▄▄▄▃▃▃▃▃731.0625.0769.0686.0597.0204.0448.0442.0364.0210.022.0-4.055.0115.02788.02047.01925.01780.01693.01752.01714.01531.01344.01280.01514.01716.01744.01658.01732.01578.01504.01267.01221.01362.01129.01171.01010.01047.0901.0703.0903.0855.0769.0NANANA
us-gaap:TreasuryStockValue ██████▅▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁1809.01809.01790.01788.01790.01791.01544.01485.01482.01483.01492.01496.01498.01389.01387.01370.01372.01320.01319.01288.01292.01294.01308.01306.01288.01272.01287.01293.01283.01285.01290.01238.01232.01227.01225.01221.01216.01217.01220.01224.01195.01197.01201.0NANANA
 us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▇█▅▇▅█▅▅▅█▄▄▅█▅▂▄▇▂▂▄▅▁▂▂▄8.09.07.08.07.09.07.07.07.09.06.06.07.09.07.05.06.08.05.05.06.07.04.05.05.06.0NANANANA4.04.05.05.04.04.04.04.03.03.04.03.02.03.03.03.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▆▇▇▄▅▆▅▄▆▆▅▃▅▅▅▃▅▅▄▅▅▅▄▄▄▅▄▃▅▅▄▂▄▄▃▃▃▃▁▂▃▃▃▃563.0354.0372.0505.0447.0167.0328.0404.0276.0200.0355.0362.0310.0154.0306.0301.0309.0136.0279.0334.0233.0257.0309.0285.0255.0215.0240.0282.0222.0129.0258.0287.0194.057.0205.0168.0117.0148.099.0144.0-53.057.0114.0164.0143.0110.0
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▅▅▄▅▅▅▂▄▆▆▅▄▆▅▅▆▃▆▆▄▅▇▃▂▆▇▃▅█▄▆▅▅▆█▄▅█▅█▇▅▇▄▃-373.0-153.0-148.0-170.0-106.0-136.0-153.0-310.0-160.0-56.0-71.0-115.0-211.0-54.0-99.0-126.0-87.0-246.0-70.0-79.0-199.0-108.0-4.0-231.0-301.0-88.020.0-234.0-136.039.0-189.0-90.0-128.0-102.0-47.047.0-204.0-100.063.0-97.056.0-30.0-127.013.0-176.0-239.0
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▃▆▆▁▄▆▆▆▆▅▄▅▃▆▅▆▅▆▆▇▄▆▆▇▇▆▅▇▅▇▇▇▇▇▇▇█▇▇█▇▇██-134.0-154.0-238.0-127.0-121.0-312.0-195.0-110.0-115.0-126.0-116.0-152.0-182.0-153.0-224.0-107.0-159.0-124.0-132.0-102.0-100.0-80.0-180.0-122.0-107.0-78.0-81.0-98.0-145.0-80.0-147.0-68.0-64.0-62.0-87.0-62.0-74.0-62.0-32.0-52.0-69.0-33.0-47.0-57.0-44.0-26.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit ▇▇█▇█▂▇▆▇▇▄▇▆▅▁▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆94.0112.0201.075.0213.0-353.0107.018.074.0144.0-177.0163.014.0-47.0-476.00.0-3.035.018.013.0-5.012.09.05.02.00.016.08.05.08.04.05.01.09.022.07.0-9.06.016.0-25.02.0-10.038.06.0-16.02.0
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▆▇▇▄▅▆▅▄▆▆▅▃▅▅▅▃▅▅▄▅▅▅▄▄▄▅▄▃▅▅▄▂▄▄▃▃▃▃▁▂▃▃▃▃563.0354.0372.0505.0447.0167.0328.0404.0276.0200.0355.0362.0310.0154.0306.0301.0309.0136.0279.0334.0233.0257.0309.0285.0255.0215.0240.0282.0222.0129.0258.0287.0194.057.0205.0168.0117.0148.099.0144.0-53.057.0114.0164.0143.0110.0
us-gaap:NetIncomeLoss ▇▇█▆█▁▇▆▆▇▃▆▅▅▇▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅703.0620.01049.0484.0909.0-1226.0626.0248.0428.0695.0-452.0553.0217.0-31.0642.0102.0100.0201.0100.0180.0123.0188.0156.0174.0176.0128.0167.0183.084.091.0122.0131.0110.0154.0192.0111.032.086.0134.019.0-49.062.0126.0156.027.068.0
us-gaap:ShareBasedCompensation ▇█▆▇▆█▆▆▆█▅▅▆█▆▄▅▇▄▄▅▆▃▄▃▆▃▄▃▅▃▃▄▄▃▃▃▃▂▂▃▂▁▂▂▂8.09.07.08.07.09.07.07.07.09.06.06.07.09.07.05.06.08.05.05.06.07.04.05.04.07.04.05.04.06.04.04.05.05.04.04.04.04.03.03.04.03.02.03.03.03.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▅▅▄▅▅▅▂▄▆▆▅▄▆▅▅▆▃▆▆▄▅▇▃▂▆▇▃▅█▄▆▅▅▆█▄▅█▅█▇▅▇▄▃-373.0-153.0-148.0-170.0-106.0-136.0-153.0-310.0-160.0-56.0-71.0-115.0-211.0-54.0-99.0-126.0-87.0-246.0-70.0-79.0-199.0-108.0-4.0-231.0-301.0-88.020.0-234.0-136.039.0-189.0-90.0-128.0-102.0-47.047.0-204.0-100.063.0-97.056.0-30.0-127.013.0-176.0-239.0
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▆▆▆▆▆▆▄██▆▆▆▆▅▄▆▇▄▆▄▆▅▅▄▆▄▅▄▄▅▄▄▄▄▄▄▄▄▁█▄▄▅▅▅█4.05.04.06.06.04.02.09.08.05.06.05.06.03.02.05.07.02.04.02.04.03.03.02.04.01.03.01.02.03.02.02.02.01.01.01.02.02.0-5.08.02.02.03.03.03.08.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▃▆▆▁▄▆▆▆▆▅▄▅▃▆▅▆▅▆▆▇▄▆▆▇▇▆▅▇▅▇▇▇▇▇▇▇█▇▇█▇▇██-134.0-154.0-238.0-127.0-121.0-312.0-195.0-110.0-115.0-126.0-116.0-152.0-182.0-153.0-224.0-107.0-159.0-124.0-132.0-102.0-100.0-80.0-180.0-122.0-107.0-78.0-81.0-98.0-145.0-80.0-147.0-68.0-64.0-62.0-87.0-62.0-74.0-62.0-32.0-52.0-69.0-33.0-47.0-57.0-44.0-26.0
us-gaap:PaymentsOfDividendsCommonStock ▄▃▃▃▃▃▃▃▃▃▃▃▃▂█▂▂▂▂▂▂▂▇▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁100.095.095.095.095.090.090.090.090.085.085.085.086.080.0161.081.081.077.077.078.077.074.0148.073.074.071.070.070.071.067.068.065.065.065.065.063.064.064.064.064.063.064.063.063.063.063.0
us-gaap:PaymentsForRepurchaseOfCommonStock ▁▂▁▁▁█▃▁▁▁▁▁▄▁▂▁▃▁▂▁▁▁▁▂▂▁▁▁▁▁▂▁▁▁0.028.05.00.00.0256.062.05.00.00.00.00.0110.015.022.00.055.015.037.00.02.00.012.021.020.00.00.014.00.07.052.00.00.00.0NANANA0.02.0NANANA0.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value397397397397397397397397397397397397397397397397397397397397397397397397397397397397397397397396396395394394393393393393393393393393
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.31.41.41.51.61.71.61.61.61.71.81.81.81.81.81.81.91.91.91.92.02.02.12.12.12.12.12.12.22.22.22.32.32.32.42.42.42.52.52.52.52.62.62.7

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value198198198198198198198198198198198198198198198198198198198198198198198198198198198198198198198198198197197197197196196196196196196196
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value161161160160160160162163163163162162162164163164163164164164164164163163164164163163164163163164164163163163162162162162163163163163163163162162166
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value162162162161162165165164164164164165166166166166166165165165165165165165165164163163163163163163
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value161161160160162163163163162163164164164164164164164164164164163163163163163163162162162162163162
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value400000.01000000.01400000.02700000.02500000.00400000.0700000.01100000.01300000.02800000.0600000.0600000.0700000.00300000.0400000.0300000.0700000.0700000.0700000.0700000.0700000.0335000.0340000.02056000.05045000.06059000.06215000.08590000.07858000.06919000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.363.856.523.015.65-7.563.841.512.624.27-2.783.41.33-0.193.920.620.611.220.611.090.751.140.951.061.070.781.031.120.510.560.750.80.670.951.180.690.20.530.820.12-0.30.380.780.950.170.42
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.313.826.472.995.63-7.563.791.492.594.22-2.783.381.32-0.193.880.610.61.210.61.080.741.130.941.051.060.771.021.110.510.550.740.790.660.941.170.680.20.530.820.12-0.30.380.780.950.170.42
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Benefits Losses And Expenses

us-gaap:BenefitsLossesAndExpenses

us-gaap:BenefitsLossesAndExpenses


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14231459137816131569147713711406138312921291129712941274121412831258124711841149120510991047103510681111102610211107107010059709568867978839918747699331072853762850857802
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax62.065.551.272.457.8-1491.963.782.772.359.8181.867.783.1104.186.090.990.881.990.282.087.980.682.981.081.286.581.379.891.290.085.884.286.680.374.585.397.288.680.598.8109.991.80.079.497.690.4

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value80947611325731302-1470.0632326582883-426.0494157-201.089122424528841218306375220-60.0-26.0100253109238165359177-31.0387150272-5.0232332-181.0-2.014881334-59.0166
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.321.442.025.748.01484.829.419.230.440.9-60.025.810.1-16.463.115.917.718.93.115.522.327.517.4-4.7-2.07.820.08.519.613.930.615.4-2.835.114.026.3-0.523.534.8-19.2-0.215.90.031.2-6.718.7

Deferred Policy Acquisition Cost Amortization Expense

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value295277279286276265267270251246245231236234233237229214-1511.0222214212-1449.0207204209
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.912.410.412.810.2-267.712.415.913.111.434.512.115.119.116.516.816.514.1-115.215.815.615.5-114.716.215.516.3

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense us-gaap:StatementBusinessSegments

cinf:ConsolidatedPropertyAndCasualtyInsurance


Deferred
Period End2021-06-302021-03-312020-06-302020-03-31
Value281268261256
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense95.396.894.696.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.212.09.6-258.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cinf:ConsolidatedPropertyAndCasualtyInsurance0.00.00.00.0

cinf:LifeInsurance


Deferred
Period End2021-06-302021-03-312020-06-302020-03-31
Value149.0159.0
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense4.73.25.43.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.40.6-9.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cinf:LifeInsurance0.00.00.00.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Deferred
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value274261256257257239233233225225
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense95.894.696.696.395.295.294.795.197.495.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.39.6-258.611.915.112.510.832.811.714.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidatedPropertyAndCasualtyInsuranceEntity0.00.00.00.00.00.00.00.00.00.0

us-gaap:LifeInsuranceSegment


Deferred
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value12159.010.0131213126.01110.09.017128.0-80.0151111-66.010.08.011
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense4.25.43.43.74.84.85.34.92.64.74.33.97.25.23.75.36.85.15.24.64.83.95.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.6-9.10.50.80.60.61.70.30.70.80.61.20.90.5-6.11.10.80.8-5.20.80.60.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:LifeInsuranceSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Gain Loss On Investments

us-gaap:GainLossOnInvestments

us-gaap:GainLossOnInvestments


Gain
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5205045331060-1725.086364663458105-191.0-5.01.0671219156-22.09.0
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.722.623.939.11742.45.119.030.723.96.7-15.6-0.50.16.91.30.014.6-2.51.0

us-gaap:GainLossOnInvestments us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cinf:InvestmentSegmentOfCINF


Gain
Period End2021-06-302021-03-312020-06-302020-03-31
Value5205041060-1725.0
Percentage of GainLossOnInvestments100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.722.639.11742.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:InvestmentSegmentOfCINF0.00.00.00.0

us-gaap:OperatingSegments, us-gaap:InvestmentsSegment


Gain
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value5331060-1725.086364663458105-191.0
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.939.11742.45.119.030.723.96.7-15.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:InvestmentsSegment0.00.00.00.00.00.074.80.00.0

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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value87276813166141145-1576.0781294530867-581.0618264-50.01971291282761282531662652162432481742362591071191671821482172731522911218611-97.0761742212185
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.034.548.827.642.21591.936.317.327.740.2-81.832.316.9-4.114.09.19.218.19.818.012.119.417.119.018.813.518.720.28.810.014.215.813.419.725.514.72.811.419.51.2-9.98.20.020.62.49.6

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Income
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value-55.0-21.0-2.0-4.0-1.0-11.0-15.0-7.0-11.0-46.0-12.0-11.0-8.0-17.0-13.0-16.0-14.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments-9.0-1.80.1-1.4-0.2-1.3-2.4-2.722.0-35.7-9.4-4.0-3.2-10.2-4.9-6.6-5.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.5-0.82.0-0.2-0.1-0.5-0.8-0.4-0.9-3.3-0.9-0.7-0.6-1.2-1.0-1.3-1.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.0-41.70.00.0-135.30.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:CorporateNonSegment, us-gaap:CorporateAndOther


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value22-17.0-21.0-2.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments2.5-2.2-1.80.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.0-0.8-0.82.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment us-gaap:CorporateAndOther0.00.00.00.0

us-gaap:OperatingSegments, cinf:CommercialLinesInsurance


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value1451308.0-20.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments16.616.90.71.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.35.80.320.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:CommercialLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:ExcessandSurplusLinesInsurance


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value10.08.01511-1.09.013121711151713181113191820205.0172214114.08.0135.04.09.04.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments1.11.01.11.8-0.1-0.61.74.13.21.3-2.62.84.9-36.05.610.114.86.515.67.93.06.410.25.84.42.33.45.04.73.45.42.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.40.60.5-0.0-9.10.60.70.90.52.10.90.81.50.80.91.41.21.51.40.41.21.71.10.80.30.61.00.40.30.80.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:ExcessandSurplusLinesInsurance0.00.00.00.00.00.00.00.00.00.00.028.30.00.00.024.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cinf:InvestmentSegmentOfCINF


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value6686521201-1586.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments76.684.9104.9100.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.129.344.31602.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:InvestmentSegmentOfCINF0.00.00.00.0

us-gaap:OperatingSegments, cinf:LifeInsurance


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value-2.0-2.01.02.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments-0.2-0.30.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.10.0-2.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:LifeInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:PersonalLinesInsurance


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value29-3.0-43.021
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments3.3-0.4-3.8-1.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.3-0.1-1.6-21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:PersonalLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, us-gaap:InvestmentsSegment


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value6741201-1586.0680222499796-637.0588235-65.01251361172869318117118488125178165151182130136123134
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments109.8104.9100.687.175.594.291.8109.695.189.0130.063.5105.491.4103.672.771.5103.069.440.751.471.894.864.070.3121.5114.373.773.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.344.31602.031.613.126.136.9-89.730.715.1-5.38.99.68.418.87.112.912.513.57.09.813.512.812.014.210.711.410.511.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:InvestmentsSegment0.00.00.00.00.00.00.00.096.10.00.00.085.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:LifeInsuranceSegment


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value6.01.02.0-1.05.0-2.0-1.0-5.03.08.02.0-1.0-4.04.00.05.0-4.01.0-1.0-1.01.01.0-3.00.0-4.0-1.00.0-1.00.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments1.00.1-0.1-0.11.7-0.4-0.10.90.53.0-4.0-0.5-3.13.10.03.9-1.60.6-0.4-0.50.40.4-1.70.0-1.5-0.90.0-0.60.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.0-2.0-0.00.3-0.1-0.0-0.70.20.50.2-0.1-0.30.30.00.4-0.30.1-0.1-0.10.10.1-0.20.0-0.3-0.10.0-0.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:LifeInsuranceSegment0.00.00.00.00.00.00.00.04.80.00.00.0-7.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-20.08.0-20.09756127655344715583924-2.03672265010112197264967282.05143
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments-3.30.71.312.419.02.38.8-9.55.517.8-30.029.430.218.8-0.728.128.515.718.946.849.839.114.920.825.926.21.730.523.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.90.320.24.53.30.63.57.71.83.01.24.12.81.7-0.12.75.11.93.78.09.57.42.03.95.22.30.24.43.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine0.00.00.00.00.00.00.00.04.20.00.00.04.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-2.0-43.0214.03.05.0-4.030-9.0-32.0-9.016-9.0-24.0-15.0-12.0-8.0-20.02818-2.0-25.0-3.04314-40.0-7.00.014
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments-0.3-3.8-1.30.51.00.9-0.5-5.2-1.5-12.118.08.1-7.0-18.8-5.4-9.4-3.2-12.010.68.3-0.8-10.1-1.718.25.4-37.4-5.90.07.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-1.6-21.20.20.20.3-0.24.2-0.5-2.1-0.71.1-0.6-1.7-1.0-0.9-0.6-1.52.11.4-0.2-1.9-0.23.41.1-3.3-0.60.01.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine0.00.00.00.00.00.00.00.0-2.70.00.00.0-2.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value169148267130236-350.015546102172-129.06547-19.0-445.0272875287343776069724669762328455138638141-3.02652-8.0-48.0144865-6.017
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.46.69.95.88.7353.57.22.75.38.0-18.23.43.0-1.6-31.51.92.04.92.15.23.15.64.85.45.53.65.55.91.92.43.84.43.45.77.64.0-0.32.65.4-0.8-4.91.50.06.1-0.71.9

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value476611310.091-10.0-81.094-82.022600.0-26.021230.0-150.042111-1.0-178.0967211
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.03.00.51.1-0.04.2-0.6-4.24.4-11.51.13.90.0-1.81.51.70.0-11.43.08.1-0.1-14.17.55.50.9

Insurance Commissions And Fees

us-gaap:InsuranceCommissionsAndFees

us-gaap:InsuranceCommissionsAndFees


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4.03.03.02.03.03.04.04.03.04.04.03.04.0
Percentage of InsuranceCommissionsAndFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.10.10.10.1-3.00.20.20.20.20.60.20.3

us-gaap:InsuranceCommissionsAndFees us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cinf:ExcessandSurplusLinesInsurance


Insurance
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1.01.00.00.01.00.01.00.01.00.00.01.0
Percentage of InsuranceCommissionsAndFees25.033.30.00.033.30.025.00.025.00.00.025.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.0-1.00.00.10.00.00.00.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:ExcessandSurplusLinesInsurance0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:LifeInsuranceSegment


Insurance
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.01.00.01.01.01.01.01.01.01.0
Percentage of InsuranceCommissionsAndFees0.033.30.025.025.033.325.025.033.325.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0-0.00.00.10.10.00.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:LifeInsuranceSegment0.00.00.00.00.00.00.00.01.60.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine


Insurance
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1.01.01.02.01.01.01.02.01.00.0
Percentage of InsuranceCommissionsAndFees50.033.333.350.025.033.325.050.033.30.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0-1.00.10.10.10.00.30.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine0.00.00.00.00.00.00.00.00.10.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine


Insurance
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1.01.01.01.01.01.01.01.01.02.0
Percentage of InsuranceCommissionsAndFees50.033.333.325.025.033.325.025.033.350.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0-1.00.00.10.10.00.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine0.00.00.00.00.00.00.00.00.30.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value13131413141313141313131413131413131314131313131413131313131414131413131413141413141314131314
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.60.50.60.5-13.10.60.80.70.61.80.70.81.11.00.90.90.91.10.90.91.01.01.11.01.01.01.01.11.21.21.11.31.21.21.41.31.41.51.41.41.40.01.21.51.6

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value260.0260.0261.0260.0260.0260.0260.0260.0261.0260.0260.0270.0261.0270.0260.0260.0
Percentage of InterestPaidNet100.00.0100.00.0100.0100.0100.00.0100.00.0100.00.0100.00.0100.00.0100.0100.0100.00.0100.00.0100.00.0100.0100.0100.00.0100.00.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.00.01.20.03.70.11.70.01.80.01.90.02.00.02.10.02.10.12.10.02.20.02.40.02.40.12.60.02.70.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7036201049484909-1226.0626248428695-452.0553217-31.06421021002011001801231881561741761281671838491122131110154192111328613419-49.0621261562768
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.627.838.921.733.51238.429.114.622.432.2-63.728.913.9-2.545.57.27.213.27.612.89.013.812.413.613.410.013.214.36.97.710.411.410.014.017.910.73.18.714.02.0-5.06.70.014.63.17.7

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7036201049484909-1226.0626248428695-452.0553217-31.06421021002011001801231881561741761281671838491122131110154192111328613419-49.0621261562768
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.627.838.921.733.51238.429.114.622.432.2-63.728.913.9-2.545.57.27.213.27.612.89.013.812.413.613.410.013.214.36.97.710.411.410.014.017.910.73.18.714.02.0-5.06.70.014.63.17.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Investment Income

us-gaap:NetInvestmentIncome

us-gaap:NetInvestmentIncome


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value175174172167166165168161160157161154154150156153151149153148149145150143140139140138136135137133131128136132132131132130132131130128130130
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.67.86.47.56.1-166.77.89.58.47.322.78.09.912.311.110.810.99.811.710.610.910.611.911.210.610.811.110.811.211.411.711.511.911.612.712.812.913.313.813.813.514.10.012.014.814.7

us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cinf:InvestmentSegmentOfCINF


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value175174166165
Percentage of NetInvestmentIncome100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.67.86.1-166.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:InvestmentSegmentOfCINF0.00.00.00.0

us-gaap:OperatingSegments, us-gaap:InvestmentsSegment


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value167166165168161160157161154154150156153151149153148149145150143140139140138136135137133
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.56.1-166.77.89.58.47.322.78.09.912.311.110.810.99.811.710.610.910.611.911.210.610.811.110.811.211.411.711.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:InvestmentsSegment0.00.00.00.00.00.00.00.025.20.00.00.095.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value106-144.08389393-244.06.07815418826-59.0-60.0-170.024912214587-59.03818318764-234.0-202.0-28.086-74.01547423746-141.0233-42.0161-37.0146198-200.048
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.6-6.53.14.014.5246.50.34.68.18.73.7-3.1-3.9-13.917.68.610.55.7-4.52.713.313.75.1-18.3-15.3-2.26.8-5.812.76.220.24.0-12.821.1-3.915.6-3.614.820.7-21.24.9

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value106-144.08389393-244.06.07815418826-59.0-60.0-170.024912214587-59.03818318764-234.0-202.0-28.086-74.01547423746-141.0233-42.0161-37.0146198-200.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.6-6.53.14.014.5246.50.34.68.18.73.7-3.1-3.9-13.917.68.610.55.7-4.52.713.313.75.1-18.3-15.3-2.26.8-5.812.76.220.24.0-12.821.1-3.915.6-3.614.820.7-21.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Income

us-gaap:OtherIncome

us-gaap:OtherIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.02.02.03.03.02.02.03.02.02.01.02.01.01.01.02.01.01.00.02.02.01.02.01.02.02.01.03.02.02.02.03.02.02.02.03.03.02.02.03.02.03.03.03.02.02.0
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.1-2.00.10.20.10.10.10.10.10.10.10.10.10.10.00.10.10.10.20.10.20.20.10.20.20.20.20.30.20.20.20.30.30.20.20.30.20.30.00.30.20.2

us-gaap:OtherIncome us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Other
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value3.03.02.03.02.02.02.01.01.02.01.01.02.02.01.01.02.0
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.1-2.00.20.10.10.10.10.10.10.10.10.10.10.10.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.05.60.00.05.90.00.00.00.00.00.00.0

us-gaap:OtherIncome us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:CorporateNonSegment, us-gaap:CorporateAndOther


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value3.02.03.02.0
Percentage of OtherIncome100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.1-2.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment us-gaap:CorporateAndOther0.00.00.00.0

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9151003902114310861003910932936860874879883854809874854853809753821724677670712749675686763732664642631568482571687582492656801575494575595516
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax39.945.033.551.340.0-1013.142.354.848.939.8123.145.956.769.857.361.961.656.061.753.759.953.153.652.454.158.353.553.662.961.656.755.757.251.545.055.267.459.051.569.582.261.90.053.767.858.2

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet us-gaap:StatementBusinessSegments

cinf:ConsolidatedPropertyAndCasualtyInsurance


Policyholder
Period End2021-06-302021-03-312020-06-302020-03-31
Value8309231007930
Percentage of PolicyholderBenefitsAndClaimsIncurredNet90.792.092.792.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.241.437.1-939.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cinf:ConsolidatedPropertyAndCasualtyInsurance0.00.00.00.0

cinf:LifeInsurance


Policyholder
Period End2021-06-302021-03-312020-06-302020-03-31
Value85807973
Percentage of PolicyholderBenefitsAndClaimsIncurredNet9.38.07.37.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.73.62.9-73.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cinf:LifeInsurance0.00.00.00.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Policyholder
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value10711007930835864863790798813821
Percentage of PolicyholderBenefitsAndClaimsIncurredNet93.792.792.791.892.792.291.991.392.593.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.137.1-939.438.850.845.136.6112.442.552.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidatedPropertyAndCasualtyInsuranceEntity0.00.00.00.00.00.00.00.00.00.0

us-gaap:LifeInsuranceSegment


Policyholder
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value72797368737066626368596065586362636157586053645656634948444946474351494445414443
Percentage of PolicyholderBenefitsAndClaimsIncurredNet6.37.37.37.37.88.17.57.07.48.46.87.07.67.28.47.68.79.08.58.18.07.99.37.37.79.57.67.67.710.28.16.87.410.47.55.57.88.37.77.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.22.9-73.74.03.83.23.44.05.14.84.24.34.34.44.54.54.64.84.54.44.74.25.04.64.75.44.34.34.04.64.44.64.45.35.24.54.80.04.14.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:LifeInsuranceSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet

us-gaap:PremiumsEarnedNet


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1593154415201522148214561441144613841333131812981294126012581247124112081192119111731154114811271111109410861071105910271025992954931917889877839827812773782783784768746
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax69.469.356.468.354.6-1470.767.085.172.361.7185.667.883.1102.989.288.389.579.390.985.085.684.690.988.284.485.186.183.787.286.487.586.186.484.485.785.986.085.186.686.079.384.20.073.287.584.1

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

us-gaap:OperatingSegments, cinf:CommercialAutoSegment, cinf:CommercialLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value198193189185
Percentage of PremiumsEarnedNet12.412.512.812.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.68.77.0-186.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:CommercialAutoSegment cinf:CommercialLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:CommercialCasualtySegment, cinf:CommercialLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value312303289289
Percentage of PremiumsEarnedNet19.619.619.519.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.613.610.6-291.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:CommercialCasualtySegment cinf:CommercialLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:CommercialPropertySegment, cinf:CommercialLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value259253254249
Percentage of PremiumsEarnedNet16.316.417.117.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.311.49.4-251.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:CommercialPropertySegment cinf:CommercialLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:HomeOwnerSegment, cinf:PersonalLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value178174163159
Percentage of PremiumsEarnedNet11.211.311.010.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.87.86.0-160.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:HomeOwnerSegment cinf:PersonalLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:OtherCommercialLines, cinf:CommercialLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value74707065
Percentage of PremiumsEarnedNet4.64.54.74.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.23.12.6-65.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:OtherCommercialLines cinf:CommercialLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:OtherPersonalLines, cinf:PersonalLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value52504746
Percentage of PremiumsEarnedNet3.33.23.23.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.21.7-46.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:OtherPersonalLines cinf:PersonalLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:PersonalAuto, cinf:PersonalLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value152152154154
Percentage of PremiumsEarnedNet9.59.810.410.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.66.85.7-155.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:PersonalAuto cinf:PersonalLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:WorkersCompensation, cinf:CommercialLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value68676875
Percentage of PremiumsEarnedNet4.34.34.65.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.03.02.5-75.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:WorkersCompensation cinf:CommercialLinesInsurance0.00.00.00.0

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

us-gaap:CorporateNonSegment, cinf:Reinsuranceassumedandothernonsegment


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value12612411113691898811679503934302927322622161310.010.010.00.00.0
Percentage of PremiumsEarnedNet7.98.07.38.96.16.16.18.05.73.83.02.62.32.32.12.62.11.81.31.10.90.90.90.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.55.64.16.13.4-89.94.16.84.12.35.51.81.92.41.92.31.91.41.20.90.70.70.80.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment cinf:Reinsuranceassumedandothernonsegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cinf:CommercialLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value911886870863
Percentage of PremiumsEarnedNet57.257.458.759.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax39.739.832.1-871.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:CommercialLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:ExcessandSurplusLinesInsurance


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value9589878278787672676361605756565352484748454344424240394234333130
Percentage of PremiumsEarnedNet6.05.85.75.45.35.45.35.04.84.74.64.64.44.44.54.34.24.03.94.03.83.73.83.73.83.73.63.93.23.23.03.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.14.03.23.72.9-78.83.54.23.52.98.63.13.74.64.03.83.83.23.63.43.33.23.53.33.23.13.13.32.82.82.62.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:ExcessandSurplusLinesInsurance0.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cinf:LifeInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value79697967
Percentage of PremiumsEarnedNet5.04.55.34.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.43.12.9-67.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:LifeInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:PersonalLinesInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value382376364359
Percentage of PremiumsEarnedNet24.024.424.624.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.616.913.4-362.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:PersonalLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, us-gaap:LifeInsuranceSegment


Premiums
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value7279676770676665616460595660575358595853515253514653486538
Percentage of PremiumsEarnedNet4.75.34.64.64.84.85.04.94.74.94.84.74.54.84.74.44.95.05.04.64.54.74.84.74.35.04.76.33.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.22.9-67.73.14.13.53.19.23.24.14.94.24.04.33.74.04.14.34.34.24.04.04.14.03.64.44.05.53.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:LifeInsuranceSegment0.00.00.00.00.00.00.00.098.40.00.00.098.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine


Premiums
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value865870863852834823810811805812790796792796781779779771760761757745733730720714692680680
Percentage of PremiumsEarnedNet56.858.759.359.157.759.560.861.562.062.862.763.363.564.164.765.465.465.765.966.367.267.167.067.267.267.467.466.368.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.832.1-871.739.649.143.037.5114.242.052.164.556.456.157.451.359.455.656.255.760.359.256.657.057.856.258.858.258.059.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine0.00.00.00.00.00.00.00.099.90.00.00.099.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine


Premiums
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value367364359358354348344342338331325320314307300297293288283280277272268266263258254249244
Percentage of PremiumsEarnedNet24.124.624.724.824.525.125.825.926.025.625.825.425.224.724.824.924.624.624.524.424.624.524.524.524.624.424.724.324.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.513.4-362.616.620.818.215.948.217.721.226.622.722.222.219.722.620.921.020.722.221.720.720.921.120.521.321.421.221.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine0.00.00.00.00.00.00.00.099.70.00.00.099.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine, cinf:CommercialAutoSegment


Premiums
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value189189185179175170168166161159158155151147144141139136133132126124
Percentage of PremiumsEarnedNet12.412.812.712.412.612.812.912.812.812.812.712.812.712.512.512.512.512.412.412.512.312.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.57.0-186.910.59.17.98.810.713.211.311.410.210.810.710.611.010.610.610.410.910.610.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine cinf:CommercialAutoSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine, cinf:CommercialCasualtySegment


Premiums
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value290289289277277268268272265268271265265263257257252244237234224221
Percentage of PremiumsEarnedNet19.119.519.819.220.020.120.621.021.021.521.821.922.322.422.322.822.722.322.122.121.822.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.010.6-291.916.314.512.414.017.521.719.019.617.418.919.218.820.119.119.018.519.318.819.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine cinf:CommercialCasualtySegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine, cinf:CommercialPropertySegment


Premiums
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value252254249241234234229231228225226223217215214205203196186180171161
Percentage of PremiumsEarnedNet16.617.117.116.716.917.617.617.918.118.018.218.518.218.318.518.218.317.917.417.016.716.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.39.4-251.514.212.210.812.014.818.615.916.314.615.515.715.716.015.415.314.514.814.414.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine cinf:CommercialPropertySegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine, cinf:OtherCommercialLines


Premiums
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value707065646361605856565554565756616164717379
Percentage of PremiumsEarnedNet4.64.74.54.44.64.64.64.54.44.54.44.54.74.94.95.45.55.96.66.97.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.12.6-65.73.83.32.83.13.74.64.04.03.54.04.24.14.84.65.05.56.06.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine cinf:OtherCommercialLines0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine, cinf:WorkersCompensation


Premiums
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value64687573747780858084868490898993909393959295
Percentage of PremiumsEarnedNet4.24.65.25.05.35.86.26.66.36.76.97.07.67.67.78.38.18.58.79.09.09.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.92.5-75.84.33.93.64.25.56.55.96.25.56.46.56.57.36.87.27.37.87.78.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine cinf:WorkersCompensation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine, cinf:HomeOwnerSegment


Premiums
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value165163159154149147142139136131128125122121119117114114110111109103
Percentage of PremiumsEarnedNet10.811.010.910.710.811.010.910.710.810.510.310.310.210.310.310.410.310.410.310.510.610.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.46.0-160.69.17.86.87.48.911.19.39.28.28.78.88.79.28.78.98.69.19.28.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine cinf:HomeOwnerSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine, cinf:OtherPersonalLines


Premiums
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value48474644444241393835353434323332333132302929
Percentage of PremiumsEarnedNet3.23.23.23.03.23.23.23.03.02.82.82.82.92.72.92.83.02.83.02.82.82.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.21.7-46.52.62.31.92.12.53.12.52.52.22.42.32.42.52.52.42.52.52.42.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine cinf:OtherPersonalLines0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine, cinf:PersonalAuto


Premiums
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value154154154156155155155153151148144141137135131128125123121117116112
Percentage of PremiumsEarnedNet10.110.410.610.811.211.611.911.812.011.911.611.711.511.511.411.411.311.211.311.011.311.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.95.7-155.69.28.17.28.19.812.310.510.49.39.89.89.610.09.59.69.59.69.89.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine cinf:PersonalAuto0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PremiumsEarnedNet us-gaap:StatementBusinessSegments

cinf:ConsolidatedPropertyAndCasualtyInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value1514147514031389
Percentage of PremiumsEarnedNet95.095.594.795.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax66.066.251.7-1403.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cinf:ConsolidatedPropertyAndCasualtyInsurance0.00.00.00.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Premiums
Period End2020-09-302020-06-302019-09-302019-06-30
Value1450140313761317
Percentage of PremiumsEarnedNet95.394.795.295.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax65.151.780.968.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidatedPropertyAndCasualtyInsuranceEntity0.00.00.00.0

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RealizedInvestmentGainsLosses


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5205049975331060-1725.053786364663-774.0458105-191.0-8.07.0-11.0160-37.0564461-40.03.06047326514226.02214411310.06.013-7.0-2.0671219155-23.08.0
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.722.637.023.939.11742.425.05.119.030.7-109.023.96.7-15.6-0.60.5-0.810.5-2.84.03.24.5-3.20.24.63.72.55.11.21.90.51.91.33.71.21.00.61.3-0.7-0.26.91.30.014.5-2.60.9

us-gaap:RealizedInvestmentGainsLosses us-gaap:InvestmentType

us-gaap:DebtSecurities


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value9.03.07.03.00.0-75.01.0-1.0-1.02.0-2.01.0
Percentage of RealizedInvestmentGainsLosses1.70.60.70.60.04.30.2-1.2-0.30.30.30.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.10.30.10.075.80.0-0.1-0.10.1-0.30.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DebtSecurities0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecurities


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value4894919755301068-1653.054189366656-763.0458
Percentage of RealizedInvestmentGainsLosses94.097.497.899.4100.895.8100.7103.5100.598.998.6100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.322.036.223.839.41669.725.15.219.130.4-107.523.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:EquitySecurities0.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value22952227269422272714-99.02152170019132159710191515581224141114121386152313121402137113641263127813161285126212801214118911721152110411031070103510209869559449759299361071878887
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value22952227269422272714-99.02152170019132159710191515581224141114121386152313121402137113641263127813161285126212801214118911721152110411031070103510209869559449759299361071878887
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value1291261131399491901198152403631302834272316151211121.02.0
Percentage of Revenues5.65.74.26.23.5-91.94.27.04.22.45.61.92.02.52.02.41.91.51.21.10.90.81.00.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.65.74.26.23.5-91.94.27.04.22.45.61.92.02.52.02.41.91.51.21.10.90.81.00.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, cinf:CommercialLinesInsurance


Revenuesus-gaap:
Period End2021-06-302021-03-312020-06-302020-03-31
Value912887871864
Percentage of Revenues39.739.832.1-872.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax39.739.832.1-872.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:CommercialLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:ExcessandSurplusLinesInsurance


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-30
Value9689888278797673676461605856565353474945444243394234
Percentage of Revenues4.24.03.33.72.9-79.83.54.33.53.08.63.13.74.64.03.83.83.63.53.33.53.33.33.13.32.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.24.03.33.72.9-79.83.54.33.53.08.63.13.74.64.03.83.83.63.53.33.53.33.33.13.32.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:ExcessandSurplusLinesInsurance0.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cinf:InvestmentSegmentOfCINF


Revenuesus-gaap:
Period End2021-06-302021-03-312020-06-302020-03-31
Value6956781226-1560.0
Percentage of Revenues30.330.445.21575.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.330.445.21575.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:InvestmentSegmentOfCINF0.00.00.00.0

us-gaap:OperatingSegments, cinf:LifeInsurance


Revenuesus-gaap:
Period End2021-06-302021-03-312020-06-302020-03-31
Value80708067
Percentage of Revenues3.53.12.9-67.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.53.12.9-67.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:LifeInsurance0.00.00.00.0

us-gaap:OperatingSegments, cinf:PersonalLinesInsurance


Revenuesus-gaap:
Period End2021-06-302021-03-312020-06-302020-03-31
Value383377365360
Percentage of Revenues16.716.913.4-363.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.716.913.4-363.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cinf:PersonalLinesInsurance0.00.00.00.0

us-gaap:OperatingSegments, us-gaap:InvestmentsSegment


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value7001226-1560.0705247524820-613.0612259-41.0148160140309116204193206110146200186172203150157143155
Percentage of Revenues31.445.21575.832.814.527.438.0-86.332.016.6-3.310.511.310.120.38.814.614.115.18.711.415.214.513.615.912.413.212.213.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.445.21575.832.814.527.438.0-86.332.016.6-3.310.511.310.120.38.814.614.115.18.711.415.214.513.615.912.413.212.213.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:InvestmentsSegment0.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:LifeInsuranceSegment


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value7280676871686766626561605761595460605954535354534754506639
Percentage of Revenues3.22.9-67.73.24.23.63.19.33.24.25.04.34.04.43.94.14.34.44.34.34.14.04.24.23.74.44.25.63.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.22.9-67.73.24.23.63.19.33.24.25.04.34.04.43.94.14.34.44.34.34.14.04.24.23.74.44.25.63.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:LifeInsuranceSegment0.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value866871864854835824811813806812792798793797782781780772761762758746734731721715693681681
Percentage of Revenues38.932.1-872.739.749.143.137.6114.542.152.164.756.656.257.551.359.555.656.355.860.359.356.757.157.956.358.958.358.159.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.932.1-872.739.749.143.137.6114.542.152.164.756.656.257.551.359.555.656.355.860.359.356.757.157.956.358.958.358.159.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine0.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value368365360359355349345343339333326321315308302298294289284281278272269266264259254249244
Percentage of Revenues16.513.4-363.616.720.918.216.048.317.721.426.622.722.322.219.822.721.021.120.822.221.820.720.921.120.621.321.421.221.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.513.4-363.616.720.918.216.048.317.721.426.622.722.322.219.822.721.021.120.822.221.820.720.921.120.621.321.421.221.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine0.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2967728313275422637025450233672540824742243372335221935224802176021470218432159221238207532038620455201511944718888187511888818897187531847418335179421766217339170341703716548164791608916022156681541215702153691509514440
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-31
Value12217111608964
Percentage of Assets44.443.940.9
Percentage of Assets44.443.940.9
Percentage of Assets srt:ParentCompany100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value800754707872936896834485476371416459478338385484499335361
Percentage of Assets3.03.03.03.43.83.73.62.22.11.71.92.12.21.61.92.42.41.71.9
Percentage of Assets3.03.03.03.43.83.73.62.22.11.71.92.12.21.61.92.42.41.71.9
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:StatementBusinessSegments

cinf:ConsolidatedPropertyAndCasualtyInsurance


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value4376416338383437
Percentage of Assets14.714.713.913.5
Percentage of Assets14.714.713.913.5
Percentage of Assets cinf:ConsolidatedPropertyAndCasualtyInsurance100.0100.0100.0100.0

cinf:InvestmentSegmentOfCINF


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value22825218032133219583
Percentage of Assets76.977.077.577.1
Percentage of Assets76.977.077.577.1
Percentage of Assets cinf:InvestmentSegmentOfCINF100.0100.0100.0100.0

cinf:LifeInsurance


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value1580157416611516
Percentage of Assets5.35.66.06.0
Percentage of Assets5.35.66.06.0
Percentage of Assets cinf:LifeInsurance100.0100.0100.0100.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Assetsus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value3796375134443437336434413285
Percentage of Assets14.414.714.713.513.614.115.0
Percentage of Assets14.414.714.713.513.614.115.0
Percentage of Assets srt:ConsolidatedPropertyAndCasualtyInsuranceEntity100.0100.0100.0100.0100.0100.0100.0

us-gaap:CorporateAndOther


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value896773711872485459484361
Percentage of Assets3.02.72.63.42.22.12.41.9
Percentage of Assets3.02.72.63.42.22.12.41.9
Percentage of Assets us-gaap:CorporateAndOther100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentsSegment


Assetsus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value201551937517699195831890618464177381674117457169721674817112166931643116123155691568215506149781448514476146061454414441143221410413730136181313712983130991259912582123641222311883115891181411543
Percentage of Assets76.476.175.777.176.475.976.076.377.778.078.078.377.377.477.776.476.776.977.076.777.277.377.077.077.576.976.577.175.876.276.976.176.476.876.375.875.275.276.5
Percentage of Assets76.476.175.777.176.475.976.076.377.778.078.078.377.377.477.776.476.776.977.076.777.277.377.077.077.576.976.577.175.876.276.976.176.476.876.375.875.275.276.5
Percentage of Assets us-gaap:InvestmentsSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LifeInsuranceSegment


Assetsus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value161915701517151615361536147214241418140614181409142414271359136614171422137213251328127713061316126912631302122512631254119312011200117712301244115112521214
Percentage of Assets6.16.26.56.06.26.36.36.56.36.56.66.56.66.76.56.76.97.17.17.07.16.86.97.06.96.97.36.97.37.47.07.37.37.37.77.97.58.08.0
Percentage of Assets6.16.26.56.06.26.36.36.56.36.56.66.56.66.76.56.76.97.17.17.07.16.86.97.06.96.97.36.97.37.47.07.37.37.37.77.97.58.08.0
Percentage of Assets us-gaap:LifeInsuranceSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value178191717516753166251619215325155441537115206147221410214146138441352413600140691386513497133261333413180127121246112401123911228912180120981199211774115921152311335112521109511120109451081510613106261064510251100639680
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets60.060.760.863.063.665.661.262.162.563.064.362.963.663.062.365.265.365.065.465.265.465.466.066.165.665.064.965.565.465.665.666.566.566.067.067.568.067.567.768.967.866.766.767.0

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-312018-12-31
Value142812961131
Percentage of Liabilities8.58.38.0
Percentage of Assets5.25.15.2
Percentage of Assets srt:ParentCompany11.711.612.6

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2967728313275422637025450233672540824742243372335221935224802176021470218432159221238207532038620455201511944718888187511888818897187531847418335179421766217339170341703716548164791608916022156681541215702153691509514440
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-31
Value12217111608964
Percentage of LiabilitiesAndStockholdersEquity44.443.940.9
Percentage of Assets44.443.940.9
Percentage of Assets srt:ParentCompany100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1185811138107899745925880429864937191318630783383347916794682437523737372567060712169716735642763506497660865736376634361686070581656995785545353595144520750554786505751185032501047374865476041825929
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.039.339.237.036.434.438.837.937.537.035.737.136.437.037.734.834.735.034.634.834.634.634.033.934.435.035.134.534.634.434.433.533.534.033.032.532.032.532.331.132.233.333.30.00.00.033.00.00.0

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-31
Value1078998647833
Percentage of StockholdersEquity100.0100.0100.0
Percentage of Assets39.238.835.7
Percentage of Assets srt:ParentCompany88.388.487.4

us-gaap:StockholdersEquity us-gaap:Restatement, us-gaap:StatementEquityComponents

srt:ScenarioPreviouslyReported, us-gaap:RetainedEarnings


Stockholders
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-31
Value1060310085874579329257856682297625769675655180
Percentage of StockholdersEquity95.293.594.598.693.893.895.497.397.295.262.8
Percentage of Assets37.436.634.433.936.435.235.234.835.435.223.7
Percentage of Assets srt:ScenarioPreviouslyReported us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value73162576968659720444844236421022-4.0551152788204719251780169317521714153113441280151417161744165817321578150412671221136211291171101010479017039038557698146367226243472151
Percentage of StockholdersEquity6.25.67.17.06.42.54.54.74.02.40.3-0.00.71.433.827.226.124.524.024.624.622.720.920.223.326.026.526.027.325.624.821.821.423.520.721.919.620.117.814.717.916.715.316.213.414.813.18.336.3
Percentage of Assets2.52.22.82.62.30.91.81.81.50.90.1-0.00.30.512.89.59.18.68.38.68.57.97.16.88.09.19.39.09.48.88.57.37.28.06.87.16.36.55.84.65.85.65.10.00.00.04.30.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1334132213281318130913001306129512861277128112731266125812651256124912431252124412371230123212231216121012141205119811911191117711621146113411191106110010961098109410901091108710841081108110691049
Percentage of StockholdersEquity11.211.912.313.514.116.213.213.814.114.816.415.316.015.815.316.716.917.117.717.517.718.319.219.318.718.318.518.918.919.319.620.220.419.820.820.921.521.121.722.921.621.321.721.722.922.222.725.617.7
Percentage of Assets4.54.74.85.05.15.65.15.25.35.55.85.75.85.95.85.85.96.06.16.16.16.36.56.56.46.46.56.56.56.66.76.86.86.76.96.86.96.97.07.17.07.17.20.00.00.07.50.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value397397397397397397397397397397397397397397397397397397397397397397397397397397397397397397397396396395394394393393393393393393393393393393393393393
Percentage of StockholdersEquity3.33.63.74.14.34.94.04.24.34.65.14.85.05.04.85.35.45.55.65.65.75.96.26.36.16.06.06.26.36.46.56.86.96.87.27.47.67.57.88.27.87.77.87.88.38.18.39.46.6
Percentage of Assets1.31.41.41.51.61.71.61.61.61.71.81.81.81.81.81.81.91.91.91.92.02.02.12.12.12.12.12.12.22.22.22.32.32.32.42.42.42.52.52.52.52.62.60.00.00.02.70.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1120510603100859132874579329257872285668229762581647696756551805193517451565037501649154871476247564658455745054409429942874268421441524109402138963851388438853816386239773980391938283865386235793404
Percentage of StockholdersEquity94.595.293.593.794.598.693.893.193.895.497.398.097.295.262.869.070.271.171.370.470.572.374.174.971.769.068.569.167.869.570.372.572.971.073.772.774.974.676.979.776.477.779.178.280.879.481.185.657.4
Percentage of Assets37.837.436.634.634.433.936.435.335.235.234.836.335.435.223.724.124.424.824.724.524.425.025.225.424.724.124.023.923.423.924.224.324.424.124.323.623.924.224.824.824.625.926.40.00.00.026.70.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-1809.0-1809.0-1790.0-1788.0-1790.0-1791.0-1544.0-1485.0-1482.0-1483.0-1492.0-1496.0-1498.0-1389.0-1387.0-1370.0-1372.0-1320.0-1319.0-1288.0-1292.0-1294.0-1308.0-1306.0-1288.0-1272.0-1287.0-1293.0-1283.0-1285.0-1290.0-1238.0-1232.0-1227.0-1225.0-1221.0-1216.0-1217.0-1220.0-1224.0-1195.0-1197.0-1201.0-1203.0-1204.0-1196.0-1200.0-1206.0-1068.0
Percentage of StockholdersEquity-15.3-16.2-16.6-18.3-19.3-22.3-15.7-15.8-16.2-17.2-19.0-18.0-18.9-17.5-16.8-18.2-18.6-18.2-18.7-18.1-18.5-19.2-20.4-20.6-19.8-19.2-19.6-20.3-20.2-20.8-21.3-21.3-21.6-21.2-22.5-22.8-23.6-23.4-24.1-25.6-23.6-23.4-23.9-24.0-25.4-24.6-25.2-28.8-18.0
Percentage of Assets-6.1-6.4-6.5-6.8-7.0-7.7-6.1-6.0-6.1-6.4-6.8-6.7-6.9-6.5-6.3-6.3-6.5-6.4-6.5-6.3-6.4-6.7-6.9-7.0-6.8-6.7-6.9-7.0-7.0-7.2-7.3-7.1-7.2-7.2-7.4-7.4-7.6-7.6-7.8-7.9-7.6-7.8-8.00.00.00.0-8.30.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value10039479009147064867677878038027846165216046576746065437777005476135444194876405914124625214335113823804874162634244383083133793854453254025571009226
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.43.33.33.52.82.13.03.23.33.43.62.72.42.83.03.12.92.63.83.42.73.22.92.22.63.43.22.22.52.92.52.92.22.22.92.51.62.62.82.02.02.52.60.00.00.03.90.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value16197209199248
Percentage of CashAndCashEquivalentsAtCarryingValue1.825.726.730.331.9
Percentage of Assets0.10.81.00.91.2
Percentage of Assets srt:ParentCompany0.11.82.30.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1003947900914706486767787803802784
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.43.33.33.52.82.13.03.23.33.43.6

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value293290285283280281276269267265265259264259253251245242237234367465459452457452446439431424420412405398397390390383376368377368352335
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.01.01.11.11.21.11.11.11.11.21.21.21.21.21.21.21.21.21.11.82.42.42.42.42.42.42.42.42.42.42.42.42.32.42.42.42.42.42.42.42.42.32.3

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:ConsolidatedEntities

srt:ParentCompany


Accumulated
Period End2020-12-312019-12-312018-12-31
Value138129121
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment48.446.745.7
Percentage of Assets0.50.50.6
Percentage of Assets srt:ParentCompany1.11.21.3

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value213213213211209208207207207202195191188186185186184181183184186188185188187189194198203207210211213216217223229235227228234243229251
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.80.80.80.80.90.80.80.90.90.90.80.90.90.80.90.90.90.90.90.91.01.01.01.01.01.01.11.11.21.21.21.31.31.31.41.41.51.41.51.51.61.51.7

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidatedEntities

srt:ParentCompany


Property
Period End2020-12-312019-12-312018-12-31
Value143141137
Percentage of PropertyPlantAndEquipmentNet67.168.170.3
Percentage of Assets0.50.60.6
Percentage of Assets srt:ParentCompany1.21.31.5

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet us-gaap:BusinessAcquisition

us-gaap:DeferredTaxAssetsLiabilitiesNet

cinf:CincinnatiGlobalUnderwritingLtd.


Deferred
Period End2020-12-31
Value56
Percentage of DeferredTaxAssetsLiabilitiesNet100.0
Percentage of Assets0.2
Percentage of Assets cinf:CincinnatiGlobalUnderwritingLtd.0.0

cinf:MSPUnderwritingLimited


Deferred
Period End2021-06-302021-03-312020-09-30
Value525554
Percentage of DeferredTaxAssetsLiabilitiesNet0.00.00.0
Percentage of Assets0.20.20.2
Percentage of Assets cinf:MSPUnderwritingLimited0.00.00.0

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value460466438452416388381402375340308327199192216204171170198200195135154775963756998797354945761471799793142161666745
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.61.61.71.61.71.51.61.51.51.41.50.90.91.00.90.80.81.01.01.00.70.80.40.30.30.40.40.50.40.40.30.60.30.40.31.10.60.60.91.00.40.40.3

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-31
Value536148
Percentage of OtherAssets12.116.015.6
Percentage of Assets0.20.20.2
Percentage of Assets srt:ParentCompany0.40.50.5

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value789788788788788788788788788788788787787787787787787787787786786786786791791791791790790790790790790790790790790790790790790790790790
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.72.82.93.03.13.43.13.23.23.43.63.53.63.73.63.63.73.83.93.83.94.04.24.24.24.24.24.34.34.44.54.64.64.64.84.84.94.95.05.15.05.15.25.5

us-gaap:LongTermDebt us-gaap:DebtInstrument

cinf:SeniorDebentures69PercentDue2028


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value272727262626282828
Percentage of LongTermDebt3.43.43.43.33.33.33.53.53.5
Percentage of Assets0.10.10.10.10.10.10.10.20.2
Percentage of Assets cinf:SeniorDebentures69PercentDue20280.00.00.00.00.00.00.00.00.0

cinf:SeniorDebenturesSixPointNinePercentDueTwentyTwentyEight


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value2727272727272727272727262626262626262626262626282828282828282828282828282828
Percentage of LongTermDebt3.43.43.43.43.43.43.43.43.43.43.43.33.33.33.33.33.33.33.33.33.33.33.33.53.53.53.53.53.53.53.53.53.53.53.53.53.53.5
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets cinf:SeniorDebenturesSixPointNinePercentDueTwentyTwentyEight0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cinf:SeniorNotes6125PercentDue2034


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value370370370370370369372371371
Percentage of LongTermDebt47.047.047.047.047.046.947.047.047.0
Percentage of Assets1.31.51.71.71.82.02.02.12.2
Percentage of Assets cinf:SeniorNotes6125PercentDue20340.00.00.00.00.00.00.00.00.0

cinf:SeniorNotesSixPointOneTwoFivePercentDueTwentyThirtyFour


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value371370370370370370370370370370370370370370370370370370370369369369369372372372372371371371371371371371371371371371
Percentage of LongTermDebt47.047.047.047.047.047.047.047.047.047.047.047.047.047.047.047.047.047.047.046.946.946.946.947.047.047.047.047.047.047.047.047.047.047.047.047.047.047.0
Percentage of Assets1.31.31.31.41.51.61.51.51.51.61.71.61.71.71.71.71.71.81.81.81.81.92.02.02.02.02.02.02.02.12.12.12.22.22.22.32.32.4
Percentage of Assets cinf:SeniorNotesSixPointOneTwoFivePercentDueTwentyThirtyFour0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value848848845844845846846847847845834830828829827826826825826827825825821826823825827829831834835832833831827828831833821807
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.93.03.13.23.33.63.33.43.53.63.83.73.83.93.83.83.94.04.14.04.14.24.34.44.44.44.44.54.54.64.74.84.94.95.05.05.25.25.25.3

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2020-12-312019-12-31
Value12991079
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0
Percentage of Assets4.74.2

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value2000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value2000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value2000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value1000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value2000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1185811138107899745925880429864937191318630783383347916794682437523737372567060712169716735642763506497660865736376634361686070581656995785545353595144520750554786505751185032501047374865476041825929
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.039.339.237.036.434.438.837.937.537.035.737.136.437.037.734.834.735.034.634.834.634.634.033.934.435.035.134.534.634.434.433.533.534.033.032.532.032.532.331.132.233.333.30.00.00.033.00.00.0

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-31
Value1078998647833
Percentage of StockholdersEquity100.0100.0100.0
Percentage of Assets39.238.835.7
Percentage of Assets srt:ParentCompany88.388.487.4

us-gaap:StockholdersEquity us-gaap:Restatement, us-gaap:StatementEquityComponents

srt:ScenarioPreviouslyReported, us-gaap:RetainedEarnings


Stockholders
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-31
Value1060310085874579329257856682297625769675655180
Percentage of StockholdersEquity95.293.594.598.693.893.895.497.397.295.262.8
Percentage of Assets37.436.634.433.936.435.235.234.835.435.223.7
Percentage of Assets srt:ScenarioPreviouslyReported us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value73162576968659720444844236421022-4.0551152788204719251780169317521714153113441280151417161744165817321578150412671221136211291171101010479017039038557698146367226243472151
Percentage of StockholdersEquity6.25.67.17.06.42.54.54.74.02.40.3-0.00.71.433.827.226.124.524.024.624.622.720.920.223.326.026.526.027.325.624.821.821.423.520.721.919.620.117.814.717.916.715.316.213.414.813.18.336.3
Percentage of Assets2.52.22.82.62.30.91.81.81.50.90.1-0.00.30.512.89.59.18.68.38.68.57.97.16.88.09.19.39.09.48.88.57.37.28.06.87.16.36.55.84.65.85.65.10.00.00.04.30.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1334132213281318130913001306129512861277128112731266125812651256124912431252124412371230123212231216121012141205119811911191117711621146113411191106110010961098109410901091108710841081108110691049
Percentage of StockholdersEquity11.211.912.313.514.116.213.213.814.114.816.415.316.015.815.316.716.917.117.717.517.718.319.219.318.718.318.518.918.919.319.620.220.419.820.820.921.521.121.722.921.621.321.721.722.922.222.725.617.7
Percentage of Assets4.54.74.85.05.15.65.15.25.35.55.85.75.85.95.85.85.96.06.16.16.16.36.56.56.46.46.56.56.56.66.76.86.86.76.96.86.96.97.07.17.07.17.20.00.00.07.50.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value397397397397397397397397397397397397397397397397397397397397397397397397397397397397397397397396396395394394393393393393393393393393393393393393393
Percentage of StockholdersEquity3.33.63.74.14.34.94.04.24.34.65.14.85.05.04.85.35.45.55.65.65.75.96.26.36.16.06.06.26.36.46.56.86.96.87.27.47.67.57.88.27.87.77.87.88.38.18.39.46.6
Percentage of Assets1.31.41.41.51.61.71.61.61.61.71.81.81.81.81.81.81.91.91.91.92.02.02.12.12.12.12.12.12.22.22.22.32.32.32.42.42.42.52.52.52.52.62.60.00.00.02.70.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1120510603100859132874579329257872285668229762581647696756551805193517451565037501649154871476247564658455745054409429942874268421441524109402138963851388438853816386239773980391938283865386235793404
Percentage of StockholdersEquity94.595.293.593.794.598.693.893.193.895.497.398.097.295.262.869.070.271.171.370.470.572.374.174.971.769.068.569.167.869.570.372.572.971.073.772.774.974.676.979.776.477.779.178.280.879.481.185.657.4
Percentage of Assets37.837.436.634.634.433.936.435.335.235.234.836.335.435.223.724.124.424.824.724.524.425.025.225.424.724.124.023.923.423.924.224.324.424.124.323.623.924.224.824.824.625.926.40.00.00.026.70.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-1809.0-1809.0-1790.0-1788.0-1790.0-1791.0-1544.0-1485.0-1482.0-1483.0-1492.0-1496.0-1498.0-1389.0-1387.0-1370.0-1372.0-1320.0-1319.0-1288.0-1292.0-1294.0-1308.0-1306.0-1288.0-1272.0-1287.0-1293.0-1283.0-1285.0-1290.0-1238.0-1232.0-1227.0-1225.0-1221.0-1216.0-1217.0-1220.0-1224.0-1195.0-1197.0-1201.0-1203.0-1204.0-1196.0-1200.0-1206.0-1068.0
Percentage of StockholdersEquity-15.3-16.2-16.6-18.3-19.3-22.3-15.7-15.8-16.2-17.2-19.0-18.0-18.9-17.5-16.8-18.2-18.6-18.2-18.7-18.1-18.5-19.2-20.4-20.6-19.8-19.2-19.6-20.3-20.2-20.8-21.3-21.3-21.6-21.2-22.5-22.8-23.6-23.4-24.1-25.6-23.6-23.4-23.9-24.0-25.4-24.6-25.2-28.8-18.0
Percentage of Assets-6.1-6.4-6.5-6.8-7.0-7.7-6.1-6.0-6.1-6.4-6.8-6.7-6.9-6.5-6.3-6.3-6.5-6.4-6.5-6.3-6.4-6.7-6.9-7.0-6.8-6.7-6.9-7.0-7.0-7.2-7.3-7.1-7.2-7.2-7.4-7.4-7.6-7.6-7.8-7.9-7.6-7.8-8.00.00.00.0-8.30.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value397397397397397397397397397397397397397397397397397397397397397397397397397397397397397397397396396395394394393393393393393393393393
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.31.41.41.51.61.71.61.61.61.71.81.81.81.81.81.81.91.91.91.92.02.02.12.12.12.12.12.12.22.22.22.32.32.32.42.42.42.52.52.52.52.62.62.7

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13341322132813181309130013061295128612771281127312661258126512561249124312521244123712301232122312161210121412051198119111911177116211461134111911061100109610981094109010911081
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.54.74.85.05.15.65.15.25.35.55.85.75.85.95.85.85.96.06.16.16.16.36.56.56.46.46.56.56.56.66.76.86.86.76.96.86.96.97.07.17.07.17.27.5

us-gaap:AdditionalPaidInCapitalCommonStock us-gaap:ConsolidatedEntities

srt:ParentCompany


Additional
Period End2020-12-312019-12-312018-12-31
Value132813061281
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0
Percentage of Assets4.85.15.8
Percentage of Assets srt:ParentCompany10.911.714.3

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value11205106031008591328745793292578722856682297625816476967565518051935174515650375016491548714762475646584557450544094299428742684214415241094021389638513884388538163862397739803862
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.837.436.634.634.433.936.435.335.235.234.836.335.435.223.724.124.424.824.724.524.425.025.225.424.724.124.023.923.423.924.224.324.424.124.323.623.924.224.824.824.625.926.426.7

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

srt:ParentCompany


Retained
Period End2020-12-312019-12-312018-12-31
Value1008592577625
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0
Percentage of Assets36.636.434.8
Percentage of Assets srt:ParentCompany82.582.985.1

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value73162576968659720444844236421022-4.055115278820471925178016931752171415311344128015141716174416581732157815041267122113621129117110101047901703903855769624347
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 Assets2.52.22.82.62.30.91.81.81.50.90.1-0.00.30.512.89.59.18.68.38.68.57.97.16.88.09.19.39.09.48.88.57.37.28.06.87.16.36.55.84.65.85.65.14.30.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

srt:ParentCompany


Accumulated
Period End2020-12-312019-12-312018-12-31
Value76944822
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0
Percentage of Assets2.81.80.1
Percentage of Assets srt:ParentCompany6.34.00.2

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:Restatement, us-gaap:StatementEquityComponents

srt:ScenarioPreviouslyReported, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Accumulated
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value656811610211467386229372807
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax105.0105.5102.2103.4104.2106.0109.0168.2100.7
Percentage of Assets2.32.92.40.91.81.61.00.212.9
Percentage of Assets srt:ScenarioPreviouslyReported us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.0

srt:ScenarioPreviouslyReported, us-gaap:AccumulatedOtherComprehensiveIncome


Accumulated
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value625769597204448364210222788
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.82.30.91.81.50.90.112.8
Percentage of Assets srt:ScenarioPreviouslyReported us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

cinf:AccumulatedNetUnrealizedGainLossOnDeferredCostsReservesAndOther


Accumulated
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-31
Value-8.0-6.0-6.01.0-10.0-10.0-9.0-5.0-1.0-1.0-2.0-3.0-8.0-5.0-4.0-5.0-6.0-10.0-7.0-3.00.0-3.0-6.0-10.0-9.0-8.0-11.0-12.0-11.0-12.0-17.0-33.0-19.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-1.0-0.9-1.00.5-2.2-2.3-2.5-2.4-4.525.0-3.6-2.6-0.3-0.2-0.2-0.3-0.4-0.6-0.4-0.20.0-0.2-0.4-0.6-0.5-0.5-0.6-0.8-0.7-0.9-1.4-2.9-2.1
Percentage of Assets-0.0-0.0-0.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.0-0.0-0.1-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.1
Percentage of Assets cinf:AccumulatedNetUnrealizedGainLossOnDeferredCostsReservesAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-31
Value-30.0-31.0-34.0-7.0-7.0-8.0-9.0-13.0-13.0-14.0-14.0-10.0-10.0-11.0-11.0-17.0-17.0-17.0-18.0-27.0-27.0-28.0-28.0-21.0-22.0-23.0-24.0-12.0-13.0-13.0-12.0-62.0-63.0-66.0-57.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-4.1-5.0-4.4-1.0-1.2-3.9-2.0-2.9-3.6-6.7-63.6250.0-18.2-9.6-0.4-0.8-0.9-1.0-1.1-1.5-1.6-1.8-2.1-1.6-1.5-1.3-1.4-0.7-0.8-0.8-0.8-4.9-5.2-5.8-6.3
Percentage of Assets-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.4-0.4-0.4-0.4
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-31
Value761656811699610211467465386229377.06712928072069194618021717178917481562137213041542174917771678175616031527134113011228977
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax104.1105.0105.5101.9102.2103.4104.2105.2106.0109.0168.2-175.0121.8112.2100.7101.1101.1101.2101.4102.1102.0102.0102.1101.9101.8101.9101.9101.2101.4101.6101.5105.8106.6108.8108.4
Percentage of Assets2.62.32.92.72.40.91.81.91.61.00.20.00.30.612.99.69.28.78.48.78.78.07.37.08.29.39.59.19.68.98.67.77.67.46.2
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value73162576968659720444844236421022-4.055115278820471925178016931752171415311344128015141716174416581732157815041267122113621129117110101047901
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.22.82.62.30.91.81.81.50.90.1-0.00.30.512.89.59.18.68.38.68.57.97.16.88.09.19.39.09.48.88.57.37.28.06.87.16.36.55.8
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value18091809179017881790179115441485148214831492149614981389138713701372132013191288129212941308130612881272128712931283128512901238123212271225122112161217122012241195119712011200
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.16.46.56.87.07.76.16.06.16.46.86.76.96.56.36.36.56.46.56.36.46.76.97.06.86.76.97.07.07.27.37.17.27.27.47.47.67.67.87.97.67.88.08.3

us-gaap:TreasuryStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Treasury
Period End2020-12-312019-12-312018-12-31
Value179015441492
Percentage of TreasuryStockValue100.0100.0100.0
Percentage of Assets6.56.16.8
Percentage of Assets srt:ParentCompany14.713.816.6

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.09.07.08.07.09.07.07.07.09.06.06.07.09.07.05.06.08.05.05.06.07.04.05.05.06.04.04.05.05.04.04.04.04.03.03.04.03.02.03.03.03.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5633543725054471673284042762003553623101543063013091362793342332573092852552152402822221292582871945720516811714899144-53.057114164143110
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.515.913.822.716.5-168.715.223.814.49.350.018.919.912.621.721.322.38.921.323.817.018.824.522.319.416.719.022.018.310.822.024.917.65.219.216.211.515.010.415.3-5.46.112.215.316.312.4

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-373.0-153.0-148.0-170.0-106.0-136.0-153.0-310.0-160.0-56.0-71.0-115.0-211.0-54.0-99.0-126.0-87.0-246.0-70.0-79.0-199.0-108.0-4.0-231.0-301.0-88.020-234.0-136.039-189.0-90.0-128.0-102.0-47.047-204.0-100.063-97.056-30.0-127.013-176.0-239.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.3-6.9-5.5-7.6-3.9137.4-7.1-18.2-8.4-2.6-10.0-6.0-13.5-4.4-7.0-8.9-6.3-16.2-5.3-5.6-14.5-7.9-0.3-18.1-22.9-6.81.6-18.3-11.23.3-16.1-7.8-11.6-9.2-4.44.5-20.0-10.16.6-10.35.7-3.2-13.61.2-20.0-26.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-134.0-154.0-238.0-127.0-121.0-312.0-195.0-110.0-115.0-126.0-116.0-152.0-182.0-153.0-224.0-107.0-159.0-124.0-132.0-102.0-100.0-80.0-180.0-122.0-107.0-78.0-81.0-98.0-145.0-80.0-147.0-68.0-64.0-62.0-87.0-62.0-74.0-62.0-32.0-52.0-69.0-33.0-47.0-57.0-44.0-26.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.8-6.9-8.8-5.7-4.5315.2-9.1-6.5-6.0-5.8-16.3-7.9-11.7-12.5-15.9-7.6-11.5-8.1-10.1-7.3-7.3-5.9-14.3-9.5-8.1-6.1-6.4-7.7-11.9-6.7-12.5-5.9-5.8-5.6-8.1-6.0-7.3-6.3-3.4-5.5-7.1-3.6-5.0-5.3-5.0-2.9

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9411220175213-353.01071874144-177.016314-47.0-476.00.0-3.0351813-5.0129.05.02.00.0168.05.08.04.05.01.09.0227.0-9.06.016-25.02.0-10.0386.0-16.02.0
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5633543725054471673284042762003553623101543063013091362793342332573092852552152402822221292582871945720516811714899144-53.057114164143110
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.515.913.822.716.5-168.715.223.814.49.350.018.919.912.621.721.322.38.921.323.817.018.824.522.319.416.719.022.018.310.822.024.917.65.219.216.211.515.010.415.3-5.46.112.215.316.312.4

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7036201049484909-1226.0626248428695-452.0553217-31.06421021002011001801231881561741761281671838491122131110154192111328613419-49.0621261562768
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.627.838.921.733.51238.429.114.622.432.2-63.728.913.9-2.545.57.27.213.27.612.89.013.812.413.613.410.013.214.36.97.710.411.410.014.017.910.73.18.714.02.0-5.06.713.514.63.17.7

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7036201049484909-1226.0626248428695-452.0553217-31.06421021002011001801231881561741761281671838491122131110154192111328613419-49.0621261562768
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.627.838.921.733.51238.429.114.622.432.2-63.728.913.9-2.545.57.27.213.27.612.89.013.812.413.613.410.013.214.36.97.710.411.410.014.017.910.73.18.714.02.0-5.06.713.514.63.17.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.09.07.08.07.09.07.07.07.09.06.06.07.09.07.05.06.08.05.05.06.07.04.05.04.07.04.05.04.06.04.04.05.05.04.04.04.04.03.03.04.03.02.03.03.03.0
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-373.0-153.0-148.0-170.0-106.0-136.0-153.0-310.0-160.0-56.0-71.0-115.0-211.0-54.0-99.0-126.0-87.0-246.0-70.0-79.0-199.0-108.0-4.0-231.0-301.0-88.020-234.0-136.039-189.0-90.0-128.0-102.0-47.047-204.0-100.063-97.056-30.0-127.013-176.0-239.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.3-6.9-5.5-7.6-3.9137.4-7.1-18.2-8.4-2.6-10.0-6.0-13.5-4.4-7.0-8.9-6.3-16.2-5.3-5.6-14.5-7.9-0.3-18.1-22.9-6.81.6-18.3-11.23.3-16.1-7.8-11.6-9.2-4.44.5-20.0-10.16.6-10.35.7-3.2-13.61.2-20.0-26.9

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.05.04.06.06.04.02.09.08.05.06.05.06.03.02.05.07.02.04.02.04.03.03.02.04.01.03.01.02.03.02.02.02.01.01.01.02.02.0-5.08.02.02.03.03.03.08.0
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-134.0-154.0-238.0-127.0-121.0-312.0-195.0-110.0-115.0-126.0-116.0-152.0-182.0-153.0-224.0-107.0-159.0-124.0-132.0-102.0-100.0-80.0-180.0-122.0-107.0-78.0-81.0-98.0-145.0-80.0-147.0-68.0-64.0-62.0-87.0-62.0-74.0-62.0-32.0-52.0-69.0-33.0-47.0-57.0-44.0-26.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.8-6.9-8.8-5.7-4.5315.2-9.1-6.5-6.0-5.8-16.3-7.9-11.7-12.5-15.9-7.6-11.5-8.1-10.1-7.3-7.3-5.9-14.3-9.5-8.1-6.1-6.4-7.7-11.9-6.7-12.5-5.9-5.8-5.6-8.1-6.0-7.3-6.3-3.4-5.5-7.1-3.6-5.0-5.3-5.0-2.9

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10095959595909090908585858680161818177777877741487374717070716768656565656364646464636463636363
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-03-312011-12-312010-12-31
Value0.0285.00.00.0256625.00.00.00.00.011015220.05515370.02.00.01221200.00.0140.07.0520.00.00.00.02.00.0
Percentage of PaymentsForRepurchaseOfCommonStock0.0100.0100.00.00.0100.0100.0100.00.00.00.00.0100.0100.0100.00.0100.0100.0100.00.0100.00.0100.0100.0100.00.00.0100.00.0100.0100.00.00.00.00.0100.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value19.419.310.221.20.2060.2220.0030.1560.1920.198-0.2550.1050.1780.38-0.6760.2090.2190.272-0.010.2890.2590.291-0.0010.2840.290.2640.010.2930.2150.235-0.0020.280.2570.290.0380.27-0.1030.232-4.143-0.7270.4950.1870.0160.294-0.257
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3601000.03437000.03274000.03066000.03012000.03872000.04958000.06332000.07937000.09357000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value72.5563.9956.0849.1442.1239.7839.138.3937.3436.71
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1299107962774586563812391081849710614
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value256228198399408396396354
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312015-12-312011-12-312010-12-312009-12-312008-12-31
Value34343434343434343434340.00.00.00.00.00.02.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312020-06-302020-03-312019-12-312018-12-31
Value560.00.0410.0
Percentage of DeferredTaxAssetsValuationAllowance100.00.00.0100.00.0

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:BusinessAcquisition

cinf:CincinnatiGlobalUnderwritingLtd.


Deferred
Period End2020-12-312019-12-312018-12-31
Value56410.0
Percentage of DeferredTaxAssetsValuationAllowance100.0100.00.0

cinf:MSPUnderwritingLimited


Deferred
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value5255543935
Percentage of DeferredTaxAssetsValuationAllowance0.00.00.00.00.0

cinf:Covid19PandemicRelatedIncurredLossAndExpenses

cinf:Covid19PandemicRelatedIncurredLossAndExpenses


Covid19
Period End2020-12-31
Value13
Percentage of Covid19PandemicRelatedIncurredLossAndExpenses100.0

cinf:DefinedBenefitPlanNonServiceCostBenefit us-gaap:RetirementPlanType

cinf:DefinedBenefitPlanNonServiceCostBenefit

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value2000000.0-1000000.0-2000000.0-2000000.0-1000000.0-1000000.0-1000000.0-1000000.0-2000000.0-2000000.0-2000000.0
Percentage of DefinedBenefitPlanNonServiceCostBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:IncreaseDecreaseInOtherComprehensiveIncomeLossBeforeTax us-gaap:StatementEquityComponents

cinf:IncreaseDecreaseInOtherComprehensiveIncomeLossBeforeTax

us-gaap:AccumulatedOtherComprehensiveIncome


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value133-182.0106112498-309.07.09919623734-76.0-77.0-215.0384188222134-92.05928328797-360.0-311.0-44.0133-114.023611536571-217.0358-65.0249-57.0225
Percentage of IncreaseDecreaseInOtherComprehensiveIncomeLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:IncreaseDecreaseInOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

cinf:IncreaseDecreaseInOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncome


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value106-144.08389393-244.06.07815418826-59.0-60.0-170.024912214587-59.03818318764-234.0-202.0-28.086-74.01547423746-141.0233-42.0161-37.0146
Percentage of IncreaseDecreaseInOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:IncreaseDecreaseInOtherComprehensiveIncomeLossTax us-gaap:StatementEquityComponents

cinf:IncreaseDecreaseInOtherComprehensiveIncomeLossTax

us-gaap:AccumulatedOtherComprehensiveIncome


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value27-38.02323105-65.01.02142498.0-17.0-17.0-45.0135667747-33.02110010033-126.0-109.0-16.047-40.0824112825-76.0125-23.088-20.079
Percentage of IncreaseDecreaseInOtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:IncreaseDecreaseinPremiumsandReinsurancereceivable

cinf:IncreaseDecreaseinPremiumsandReinsurancereceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value199166-70.0-139.01468618-75.013695
Percentage of IncreaseDecreaseinPremiumsandReinsurancereceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:IncreaseDecreaseofdeferredtaxassets us-gaap:BusinessAcquisition

cinf:IncreaseDecreaseofdeferredtaxassets

cinf:MSPUnderwritingLimited


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3.01.02.0154.0
Percentage of IncreaseDecreaseofdeferredtaxassets100.0100.0100.0100.0100.0

cinf:InvestmentIncomeOtherLongTermInvestments

cinf:InvestmentIncomeOtherLongTermInvestments


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1.02.01.02.02.03.02.05.02.03.02.01.01.01.01.01.01.01.01.01.00.01.01.01.01.00.00.00.01.01.01.01.00.01.00.01.01.01.0
Percentage of InvestmentIncomeOtherLongTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0

cinf:NumberOfImpairedSecuritiesIntendedtobeSold us-gaap:InvestmentType

cinf:NumberOfImpairedSecuritiesIntendedtobeSold

us-gaap:DebtSecurities


Number
Period End2020-12-312020-09-302020-06-302020-03-31
Value02.0012.0
Percentage of NumberOfImpairedSecuritiesIntendedtobeSold0.0100.00.0100.0

cinf:OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax

cinf:OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.02.00.00.0-2.03.0-1.00.0-1.0-1.00.00.01.01.01.0-1.00.01.00.00.0-3.0-1.02.01.02.00.00.02.00.00.02.02.08.00.0-2.0-2.0-1.0-2.0
Percentage of OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax0.0100.00.00.0100.0100.0100.00.0100.0100.00.00.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.00.00.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0

cinf:OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax

cinf:OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.0-8.02.00.07.0-11.00.01.04.04.00.0-1.0-1.0-5.03.01.0-1.0-1.0-4.03.04.03.0-3.0-3.0-4.01.01.0-3.0-1.01.0-1.0-5.0-16.00.03.04.04.03.0
Percentage of OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax0.0100.0100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

cinf:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentBeforeTax us-gaap:StatementEquityComponents

cinf:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentBeforeTax

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value132-196.0142112506-324.02.010020024239-77.0-80.0-221.0374189221131-110.062289290102-365.0-319.0-43.0152-120.023511728662-244.0356-42.0253-53.0228
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentNetOfTax us-gaap:StatementEquityComponents

cinf:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value105-155.011289399-256.02.07915719230-60.0-62.0-175.024612314485-72.04118619068-238.0-207.0-28.099-78.01537618640-159.0232-27.0164-34.0148
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentTax us-gaap:StatementEquityComponents

cinf:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentTax

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value27-41.03023107-68.00.02143509.0-17.0-18.0-46.0128667746-38.02110310034-127.0-112.0-15.053-42.0824110022-85.0124-15.089-19.080
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentTax100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentBeforeTax us-gaap:StatementEquityComponents

cinf:OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentBeforeTax

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.010.0-2.00.0-9.014-1.0-1.0-5.0-5.00.01.02.06.0-2.0-2.01.02.04.0-3.0-7.0-4.05.04.06.0-2.0-1.05.01.0-1.03.07.0240.0-5.0-6.0-5.0-5.0
Percentage of OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentBeforeTax0.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

cinf:OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentNetOfTax us-gaap:StatementEquityComponents

cinf:OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.08.0-2.00.0-7.0110.0-1.0-4.0-4.00.01.01.05.0-3.0-1.01.01.04.0-3.0-4.0-3.03.03.04.0-1.0-1.03.01.0-1.01.05.0160.0-3.0-4.0-4.0-3.0
Percentage of OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentNetOfTax0.0100.0100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

cinf:OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentTax us-gaap:StatementEquityComponents

cinf:OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentTax

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.02.00.00.0-2.03.0-1.00.0-1.0-1.00.00.01.01.01.0-1.00.01.00.00.0-3.0-1.02.01.02.0-1.00.02.00.00.02.02.08.00.0-2.0-2.0-1.0-2.0
Percentage of OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentTax0.0100.00.00.0100.0100.0100.00.0100.0100.00.00.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0

cinf:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodTax

cinf:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.01.0-7.00.00.00.02.00.00.00.0-1.00.00.00.06.01.00.00.05.00.00.01.0-3.00.01.00.0-6.00.00.00.0261.01.01.0-6.01.00.01.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodTax0.0100.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0100.00.00.0100.00.00.0100.0100.00.0100.00.0100.00.00.00.0100.0100.0100.0100.0100.0100.00.0100.0

cinf:OtherRealizedInvestmentGainsLossesNet us-gaap:InvestmentType

cinf:OtherRealizedInvestmentGainsLossesNet

us-gaap:EquitySecurities


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value2210.00.0-8.03.0-2.0-1.05.0-1.0
Percentage of OtherRealizedInvestmentGainsLossesNet100.0100.00.0100.0100.0100.0100.0100.0100.0

cinf:PurchaseOfTreasurySharesNonCash

cinf:PurchaseOfTreasurySharesNonCash


Purchase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value5.0160.00.03.00.02.02.05.01.01.01.02.01.02.00.04.03.03.02.05.05.05.01.05.08.03.04.04.06.07.06.09.05.07.00.00.0
Percentage of PurchaseOfTreasurySharesNonCash100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

cinf:ReclassificationfromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax us-gaap:StatementEquityComponents

cinf:ReclassificationfromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassificationfrom
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value1.02.00.00.0-16.01.00.00.01.00.00.00.01.0-5.01.0-3.056-13.0201521-14.01.0211613225.07.03.07.0
Percentage of ReclassificationfromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax100.0100.00.00.0100.0100.00.00.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:SharesAcquiredDuringPeriodValueEmployeeShareBasedCompensationPlans us-gaap:StatementEquityComponents

cinf:SharesAcquiredDuringPeriodValueEmployeeShareBasedCompensationPlans

us-gaap:TreasuryStock


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value4.03.02.00.00.03.00.02.02.05.01.01.01.02.01.02.00.04.03.03.02.05.05.05.01.05.0
Percentage of SharesAcquiredDuringPeriodValueEmployeeShareBasedCompensationPlans100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:UnderwritingAcquisitionAndInsuranceExpenses

cinf:UnderwritingAcquisitionAndInsuranceExpenses


Underwriting
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value490439457452464456442455430411398401395403389393387377359380366360354348340345334319328320324312307300298296287274264260251261249258246268
Percentage of UnderwritingAcquisitionAndInsuranceExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:WritedownofImpairedSecuritiesIntendedtobeSold us-gaap:InvestmentType

cinf:WritedownofImpairedSecuritiesIntendedtobeSold

us-gaap:DebtSecurities


Writedownof
Period End2020-09-302020-06-302020-03-31
Value1.00.077
Percentage of WritedownofImpairedSecuritiesIntendedtobeSold100.00.0100.0

us-gaap:AdditionsToContractHoldersFunds

us-gaap:AdditionsToContractHoldersFunds


Additions
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2027212023211923251922192221191819232421242621212120202125202219212420232531918.0205340274558
Percentage of AdditionsToContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssumedPremiumsEarned us-gaap:StatementBusinessSegments

us-gaap:AssumedPremiumsEarned

cinf:ConsolidatedPropertyAndCasualtyInsurance


Assumed
Period End2021-06-302021-03-312020-06-302020-03-31
Value1091016366
Percentage of AssumedPremiumsEarned100.0100.0100.0100.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Assumed
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value78636654525043423836
Percentage of AssumedPremiumsEarned0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:AssumedPremiumsWritten us-gaap:StatementBusinessSegments

us-gaap:AssumedPremiumsWritten

cinf:ConsolidatedPropertyAndCasualtyInsurance


Assumed
Period End2021-06-302021-03-312020-06-302020-03-31
Value161205101111
Percentage of AssumedPremiumsWritten100.0100.0100.0100.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Assumed
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5510111141417587304252
Percentage of AssumedPremiumsWritten0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:AvailableForSaleSecuritiesGrossRealizedGains us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesGrossRealizedGains

us-gaap:DebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value113.07.04.03.02.04.06.01.02.03.02.0
Percentage of AvailableForSaleSecuritiesGrossRealizedGains100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses

us-gaap:DebtSecurities


Available
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-30
Value2.00.00.03.00.01.02.00.01.0
Percentage of AvailableForSaleSecuritiesGrossRealizedLosses100.00.00.0100.00.0100.0100.00.0100.0

us-gaap:CapitalLeaseObligationsIncurred

us-gaap:CapitalLeaseObligationsIncurred


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value5.03.06.04.03.06.08.0-1.04.03.07.06.03.05.04.04.03.03.02.06.03.09.04.010.03.03.02.03.02.05.07.04.05.0123.0113.06.04.04.01.019
Percentage of CapitalLeaseObligationsIncurred100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5647-14.0208220-281.0-20.0-16.01.018
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CededPremiumsEarned us-gaap:StatementBusinessSegments

us-gaap:CededPremiumsEarned

cinf:ConsolidatedPropertyAndCasualtyInsurance


Ceded
Period End2021-06-302021-03-312020-06-302020-03-31
Value60554848
Percentage of CededPremiumsEarned100.0100.0100.0100.0

cinf:LifeInsurance


Ceded
Period End2021-06-302021-03-312020-06-302020-03-31
Value19181918
Percentage of CededPremiumsEarned31.732.739.637.5

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Ceded
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6748-48.0-49.0-62.0-52.0-42.0-40.0-39.0-41.0
Percentage of CededPremiumsEarned0.0100.0-100.00.00.00.00.00.00.00.0

us-gaap:LifeInsuranceSegment


Ceded
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value18-19.0-18.0124-17.0-19.0-17.0122-18.0-17.0171816171717161613181616121715151417141414171413
Percentage of CededPremiumsEarned0.0-39.6-37.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CededPremiumsWritten us-gaap:StatementBusinessSegments

us-gaap:CededPremiumsWritten

cinf:ConsolidatedPropertyAndCasualtyInsurance


Ceded
Period End2021-06-302021-03-312020-06-302020-03-31
Value-96.0-57.0-81.0-51.0
Percentage of CededPremiumsWritten100.0100.0100.0100.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Ceded
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-48.0-81.0-51.0-43.0-50.0-71.0-41.0-40.0-44.0-39.0
Percentage of CededPremiumsWritten0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:CommonStockDividendsPerShareDeclared us-gaap:StatementEquityComponents

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.630.630.60.60.60.560.560.56
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CurrentIncomeTaxExpenseBenefit

us-gaap:CurrentIncomeTaxExpenseBenefit


Current
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value75366655233.04828282848-98.033283127314010.060486551647046536818204146375459346.0203617-50.02410.05910.015
Percentage of CurrentIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseOther

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseOther


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.0-26.05.03.023-23.01.04.09.011-2.0-2.0-7.0-10.0-3.01.02.02.0-25.02.010.08.032-4.0-12.05.0
Percentage of DeferredPolicyAcquisitionCostAmortizationExpenseOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseOther us-gaap:StatementBusinessSegments

cinf:LifeInsurance


Deferred
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.0-26.023-23.0
Percentage of DeferredPolicyAcquisitionCostAmortizationExpenseOther100.0100.0100.0100.0

us-gaap:LifeInsuranceSegment


Deferred
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3.023-23.01.04.09.011-2.0-2.0-7.0-10.0-3.01.02.02.0-25.02.010.08.032-4.0-12.05.0
Percentage of DeferredPolicyAcquisitionCostAmortizationExpenseOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostsAdditions

us-gaap:DeferredPolicyAcquisitionCostsAdditions


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value340326272272306295259271295270238244266245224236249239210227230222206212221207197208216206190211203198180192192170175182183164166168171
Percentage of DeferredPolicyAcquisitionCostsAdditions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostsAdditions us-gaap:StatementBusinessSegments

cinf:ConsolidatedPropertyAndCasualtyInsurance


Deferred
Period End2021-06-302021-03-312020-06-302020-03-31
Value325312292280
Percentage of DeferredPolicyAcquisitionCostsAdditions95.695.795.494.9

cinf:LifeInsurance


Deferred
Period End2021-06-302021-03-312020-06-302020-03-31
Value15141415
Percentage of DeferredPolicyAcquisitionCostsAdditions4.44.34.65.1

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Deferred
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value258292280244256280254221229251
Percentage of DeferredPolicyAcquisitionCostsAdditions94.995.494.994.294.594.994.192.993.994.4

us-gaap:LifeInsuranceSegment


Deferred
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1414151515151617151513131312131411121211111211
Percentage of DeferredPolicyAcquisitionCostsAdditions5.14.65.15.85.55.15.97.16.15.65.35.85.54.85.46.74.85.25.45.35.25.45.3

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value1000000.02000000.00-1000000.0-1000000.00-1000000.000-1000000.00-1000000.00-1000000.00
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.00.0100.0100.00.0100.00.00.0100.00.0100.00.0100.00.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value6.05.05.06.05.05.05.05.06.06.05.06.05.05.05.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value3.02.03.03.03.04.03.03.04.03.03.04.04.03.04.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value1.03.00.01.01.01.01.01.01.00.01.02.01.02.02.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanOtherCosts us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanOtherCosts

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0-2000000.000001000000.0000
Percentage of DefinedBenefitPlanOtherCosts0.0100.00.00.00.00.0100.00.00.00.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value3.02.02.03.02.02.02.02.03.02.03.03.02.03.03.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedContributionPlanEmployerDiscretionaryContributionAmount

us-gaap:DefinedContributionPlanEmployerDiscretionaryContributionAmount


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value5.06.04.06.04.08.04.06.04.05.03.05.04.06.03.04.03.06.03.03.04.04.03.02.03.04.02.03.02.04.03.02.0
Percentage of DefinedContributionPlanEmployerDiscretionaryContributionAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DepreciationAmortizationAndAccretionNet


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2323192020221818171915161418151313141410.0121213121314131312132010.0119.01210.011114.015121111137.010.0
Percentage of DepreciationAmortizationAndAccretionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DirectPremiumsEarned us-gaap:StatementBusinessSegments

us-gaap:DirectPremiumsEarned

cinf:ConsolidatedPropertyAndCasualtyInsurance


Direct
Period End2021-06-302021-03-312020-06-302020-03-31
Value1465142913881371
Percentage of DirectPremiumsEarned100.0100.0100.0100.0

cinf:LifeInsurance


Direct
Period End2021-06-302021-03-312020-06-302020-03-31
Value98879885
Percentage of DirectPremiumsEarned6.76.17.16.2

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Direct
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1439138813711369138613191266125112381235
Percentage of DirectPremiumsEarned0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:LifeInsuranceSegment


Direct
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value90988585878683837981777772777470747571716768656861686282525856655264
Percentage of DirectPremiumsEarned0.07.16.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DirectPremiumsWritten us-gaap:StatementBusinessSegments

us-gaap:DirectPremiumsWritten

cinf:ConsolidatedPropertyAndCasualtyInsurance


Direct
Period End2021-06-302021-03-312020-06-302020-03-31
Value1649154515391458
Percentage of DirectPremiumsWritten100.0100.0100.0100.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Direct
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1386153914581309136114721335118712481336
Percentage of DirectPremiumsWritten0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStockCash

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value101102969796979192919187858687163838282797979791507675767173727268696766676665656565666565656465
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsDividends

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsDividends


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.50.7-6.00.80.003-0.003-0.0010.010.0080.0050.0470.0050.015-0.0600.0620.070.0290.0060.0320.0480.030.0010.0330.0280.046-0.0030.0270.065-0.059-0.003-0.033-0.042-0.0260.016-0.04-0.207-0.048-1.563-0.4450.052-0.0680.004-0.021-0.214
Percentage of EffectiveIncomeTaxRateReconciliationDeductionsDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-0.5-0.3-2.71.80.0030.0060.002-0.027-0.002-0.001-0.007-0.0110.0020.010-0.0090.009-0.0160.0010.0030.0050.005-0.0010.00400.0060.0010.0050.0050.0110.0020.0070.010.003-0.0040.0130.030.0060.1630.180.0030.0210.0010.0060.026
Percentage of EffectiveIncomeTaxRateReconciliationOtherAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxExemptIncome

us-gaap:EffectiveIncomeTaxRateReconciliationTaxExemptIncome


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.60.7-6.90.80.004-0.00300.0170.0080.0060.0620.0080.019-0.1-0.0020.070.070.0330.0050.0320.0480.034-0.0010.0370.0320.046-0.0060.0350.075-0.067-0.001-0.044-0.061-0.0370.026-0.053-0.276-0.076-2.743-0.8120.09-0.1160.011-0.041-0.419
Percentage of EffectiveIncomeTaxRateReconciliationTaxExemptIncome100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfInvestments

us-gaap:GainLossOnSaleOfInvestments


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value5105019885321060-1729.053781362660-775.0457101-191.0-8.07.0
Percentage of GainLossOnSaleOfInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfInvestments us-gaap:InvestmentType

us-gaap:EquitySecurities


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2.04.04.05524-4.0-1.00.0114.0-8.08.0
Percentage of GainLossOnSaleOfInvestments0.40.80.410.32.30.2-0.20.03.00.61.01.8

us-gaap:GrossInvestmentIncomeOperating

us-gaap:GrossInvestmentIncomeOperating


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value178178176170169168171165163160164157157153158156154151155151151147152146142141142140138137140135
Percentage of GrossInvestmentIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationDeductionsDividends

us-gaap:IncomeTaxReconciliationDeductionsDividends


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value4.05.04.05.04.04.05.03.04.04.04.03.05.03.09.08.09.08.09.08.08.08.09.08.07.08.08.07.07.07.08.06.06.06.07.06.06.06.05.05.05.05.05.05.0
Percentage of IncomeTaxReconciliationDeductionsDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value183161277129240-331.016462111182-122.013056-11.06946449745885893758587618291374259645276955310.039664.0-35.0266177
Percentage of IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationOtherAdjustments

us-gaap:IncomeTaxReconciliationOtherAdjustments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-03-312010-12-312010-09-30
Value-5.0-3.0-1.0115.0-10.01.0-8.0-1.0-1.02.0-7.01.00.0-1.0-2.02.0-5.01.01.01.01.02.01.00.01.03.01.01.01.02.01.01.01.01.02.01.01.00.02.02.01.02.0
Percentage of IncomeTaxReconciliationOtherAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationTaxExemptIncome

us-gaap:IncomeTaxReconciliationTaxExemptIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value5.05.05.05.05.05.05.05.04.05.05.05.05.05.09.09.09.09.09.08.08.09.08.09.08.08.08.09.08.08.08.08.09.08.08.08.08.08.09.09.09.09.09.09.0
Percentage of IncomeTaxReconciliationTaxExemptIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.0-2.05.00.07.0-9.08.0-5.02.0-4.03.0-1.06.0-10.06.0-2.07.0-11.013-5.05.0-8.010.0-3.0-1.00.04.03.00.0-5.06.0-1.0-1.02.0-1.0-2.02.0-3.02.0-3.03.0-2.05.0-6.04.0-2.0
Percentage of IncreaseDecreaseInAccruedInvestmentIncomeReceivable100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-23.034-17.0-41.0113.0-15.0-10.053-120.0-31.012127-26.0-15.0-5.0-7.0-40.052-16.064-65.016322.0-32.050-68.024-8.013-34.0673.0-28.0-44.013-20.0-37.0-18.0103-23.045-59.03651
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4549-7.0-13.02831-8.01.04424-5.0123110.0-8.0-1.02025-5.05.0179.0-2.05.017-2.0-12.013145.0-16.0212019-9.01112140.05.013154.01.08.010.0
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4015222938272827302228212621252125252725282231232720152827493120201319201815-13.029322827283028
Percentage of IncreaseDecreaseInFuturePolicyBenefitReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value69204-1.028425759914765-40.012911012372-77.06910492942116686189.068138
Percentage of IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-10.0331.00.01411-14.0-11.02225-21.08.06.08.09.0-3.0325.0-66.0-7.0271239-6.010.0-4.0-19.0-5.00.05.027-5.08.02.00.0-7.06.05.0-3.0-6.02.05.0-5.0-2.00.04.0
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value103-80.0291772-123.0354785-93.0
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities

cinf:ConsolidatedPropertyAndCasualtyInsurance


Increase
Period End2021-06-302021-03-312020-06-302020-03-31
Value1714169315591518
Percentage of IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities100.0100.0100.0100.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Increase
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value13931559151813521476138112461349
Percentage of IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities0.0100.0100.00.00.00.00.00.0

us-gaap:IncreaseDecreaseInUnearnedPremiums

us-gaap:IncreaseDecreaseInUnearnedPremiums


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value236221-64.0-83.0185134-71.0-37.0179113-75.01311955-71.0148470-81.03910147-14.0248227-46.0187559-50.0797283-26.0568247-24.0274433-20.01.02340
Percentage of IncreaseDecreaseInUnearnedPremiums100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements us-gaap:AwardType

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:EmployeeStockOption


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1.20.90.00.50.30.00.01.41.20.9-0.10.80.80.00.01.11.01.10.01.21.11.00.11.00.91.00.10.91.01.0-0.0190.7070.6911.00.0530.7390.67
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value0.60.60.00.60.40.00.00.90.70.70.00.50.50.00.00.80.70.80.01.00.90.80.10.50.50.60.00.6
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements50.066.70.0120.0133.30.00.064.358.377.8-0.062.562.50.00.072.770.072.70.083.381.880.0100.050.055.660.00.066.7

us-gaap:InterestCreditedToPolicyOwnerAccount

us-gaap:InterestCreditedToPolicyOwnerAccount


Interest
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value121110.0121110.010.011141211121113
Percentage of InterestCreditedToPolicyOwnerAccount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeDividend

us-gaap:InvestmentIncomeDividend


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value6058595553535550504650454442464342394439413742373536373534323530302734282726
Percentage of InvestmentIncomeDividend100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value117118116113114112114110111111112111112110111112111111110111110109109108106105105105103104104104103102103105106106
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInvestmentExpense

us-gaap:InvestmentIncomeInvestmentExpense


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value3.04.04.03.03.03.03.04.03.03.03.03.03.03.02.03.03.02.02.03.02.02.02.03.02.02.02.02.02.02.03.02.02.02.01.02.02.02.0
Percentage of InvestmentIncomeInvestmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAssumed1

us-gaap:LiabilitiesAssumed1


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value3944-6.015-29.077-36.0375.02310.010.0-2.0301.04.0-3.07324290.00.027
Percentage of LiabilitiesAssumed1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value334143495443369186467457361177463392341195435411373185412374328146358343304147353353309197346329
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value433562341336382631341373437647270313354519294314322509238288301416243261294399222286306387230233
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value83092382910711007930835864863790798813821791741815794788751690759661616613654689622622707676601593
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value1000000.03000000.001000000.01000000.001000000.0001000000.00001000000.001000000.001000000.01000000.01000000.01000000.00-1000000.0
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax100.0100.00.0100.0100.00.0100.00.00.0100.00.00.00.0100.00.0100.00.0100.0100.0100.0100.00.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax

cinf:AccumulatedNetUnrealizedGainLossOnDeferredCostsReservesAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.010.0-2.00.0-9.014-6.0-3.0-6.00.0-9.00.00.06.04.01.00.03.05.0-4.0-5.0-4.03.05.07.0-1.01.05.0-2.03.04.09.0270.0-4.0-5.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax0.0100.0100.00.0100.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-09-302012-06-30
Value0.02.00.00.06.00.00.00.0-5.00.00.00.0120.00.00.0130.00.00.0-12.00.00.00.0-21.00.00.0-2.0830.00.00.00.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax0.020.0-0.00.0-100.0-0.0-0.00.055.60.00.00.0300.00.00.00.0260.0-0.0-0.0-0.0-400.00.00.0-0.0-2100.00.0-0.0-66.72075.00.00.0-0.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value141-193.0149115506-399.03.09919924437-76.0-78.0-217.0360193211290-148.011933135164-363.0-260.03.0182-55.025213529182-230.0397-30.0262-47.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax0.0-1930.0-7450.00.0-5622.2-2850.0-50.0-3300.0-3316.70.0-411.10.00.0-3616.79000.019300.00.09666.7-2960.0-2975.0-6620.0-8775.02133.3-7260.0-3714.3-300.018200.0-1100.0-12600.04500.07275.0911.1-851.90.0750.0-5240.00.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

cinf:AccumulatedNetUnrealizedGainLossOnDeferredCostsReservesAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.08.0-2.00.0-7.011-5.0-3.0-5.00.0-7.00.00.05.00.01.01.01.04.0-3.0-3.0-3.01.04.04.00.01.03.0-2.02.02.07.0170.0-2.0-3.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.0100.0100.00.0100.0100.0100.0100.0100.00.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-09-302012-06-30
Value1.01.00.00.04.00.00.00.0-4.00.00.00.06.00.00.00.08.00.00.00.0-7.00.00.00.0-14.00.00.0-2.0540.00.00.00.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.012.5-0.00.0-80.0-0.0-0.00.057.10.00.00.00.00.00.00.0200.0-0.0-0.0-0.0-700.00.00.00.0-1400.00.0-0.0-100.02700.00.00.0-0.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value113-152.011792399-315.02.07815619328-59.0-60.0-172.0237126137188-97.07821323044-237.0-169.02.0116-35.01658718853-149.0258-19.0169-30.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.0-1900.0-5850.00.0-5700.0-2863.6-40.0-2600.0-3120.00.0-400.00.00.0-3440.00.012600.013700.018800.0-2425.0-2600.0-7100.0-7666.74400.0-5925.0-4225.00.011600.0-1166.7-8250.04350.09400.0757.1-876.50.0950.0-5633.30.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

cinf:AccumulatedNetUnrealizedGainLossOnDeferredCostsReservesAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.02.00.00.0-2.03.0-1.00.0-1.00.0-2.00.00.01.04.00.0-1.02.01.0-1.0-2.0-1.02.01.03.0-1.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax0.0100.00.00.0100.0100.0100.00.0100.00.0100.00.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.00.00.02.00.00.00.0-1.00.00.00.06.00.00.00.05.00.00.00.0-5.00.00.00.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax50.0-0.00.0-200.00.0-0.00.050.00.00.00.0150.00.0-0.00.0500.0-0.0-0.0-0.0-250.00.00.0-0.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value28-41.03223107-84.01.02143519.0-17.0-18.0-45.01236774102-51.04111812120-126.0-91.01.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax0.0-2050.00.00.0-5350.0-2800.0-100.00.0-4300.00.0-450.00.00.0-4500.03075.00.0-7400.05100.0-5100.0-4100.0-5900.0-12100.01000.0-12600.0-3033.3-100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

cinf:AccumulatedNetUnrealizedGainLossOnDeferredCostsReservesAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.010.0-2.00.0-9.014-1.0-1.0-5.0-5.00.01.02.06.0-2.0-2.01.02.04.0-3.0-7.0-4.05.04.06.0-2.0-1.05.01.0-1.03.07.0
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent0.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value1.04.0-34.00.01.01.06.00.01.00.0-5.00.01.00.0121.00.01.0140.01.01.0-10.01.02.01.0-18.01.00.0-1.0762.0
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent0.040.01700.00.0-11.17.1-600.0-0.0-20.0-0.00.00.050.00.0-600.0-50.00.050.0350.0-0.0-14.3-25.0-200.025.033.3-50.01800.020.00.0100.02533.328.6

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value132-196.0142112506-324.02.010020024239-77.0-80.0-221.0374189221131-110.062289290102-365.0-319.0-43.0152-120.023511728662
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent0.0-1960.0-7100.00.0-5622.2-2314.3-200.0-10000.0-4000.0-4840.00.0-7700.0-4000.0-3683.3-18700.0-9450.022100.06550.0-2750.0-2066.7-4128.6-7250.02040.0-9125.0-5316.72150.0-15200.0-2400.023500.0-11700.09533.3885.7

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

cinf:AccumulatedNetUnrealizedGainLossOnDeferredCostsReservesAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.08.0-2.00.0-7.0110.0-1.0-4.0-4.00.01.01.05.0-3.0-1.01.01.04.0-3.0-4.0-3.03.03.04.0-1.0-1.03.01.0-1.01.05.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent0.0100.0100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value1.03.0-27.00.01.01.04.00.01.00.0-4.00.01.00.06.00.00.01.09.00.01.00.0-7.01.01.01.0-12.01.00.0-1.0501.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent0.037.51350.00.0-14.39.10.0-0.0-25.0-0.00.00.0100.00.0-200.0-0.00.0100.0225.0-0.0-25.0-0.0-233.333.325.0-100.01200.033.30.0100.05000.020.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value105-155.011289399-256.02.07915719230-60.0-62.0-175.024612314485-72.04118619068-238.0-207.0-28.099-78.01537618640
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent0.0-1937.5-5600.00.0-5700.0-2327.30.0-7900.0-3925.0-4800.00.0-6000.0-6200.0-3500.0-8200.0-12300.014400.08500.0-1800.0-1366.7-4650.0-6333.32266.7-7933.3-5175.02800.0-9900.0-2600.015300.0-7600.018600.0800.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-1.0-4.0340.0-1.0-1.0-6.00.0-1.00.05.00.0-1.00.0-12.0-1.00.0-1.0-14.00.0-1.0-1.010.0-1.0-2.0-1.018-1.00.01.0-76.0-2.0-3.0-2.018-2.0-1.0-2.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax100.0100.0100.00.0100.0100.0100.00.0100.00.0100.00.0100.00.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-1.0-3.0270.0-1.0-1.0-4.00.0-1.00.04.00.0-1.00.0-6.00.00.0-1.0-9.00.0-1.00.07.0-1.0-1.0-1.012-1.00.01.0-50.0-1.0-2.0-1.012-1.0-1.0-1.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.00.0100.0100.0100.00.0100.00.0100.00.0100.00.0100.00.00.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.0-1.00.00.0-2.00.00.00.01.00.00.00.0-6.0-1.00.00.0-5.00.00.0-1.03.00.0-1.00.06.00.00.00.0-26.0-1.0-1.0-1.06.0-1.00.0-1.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax0.0100.00.00.0100.00.00.00.0100.00.00.00.0100.0100.00.00.0100.00.00.0100.0100.00.0100.00.0100.00.00.00.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

cinf:AccumulatedNetUnrealizedGainLossOnDeferredCostsReservesAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.02.00.00.0-2.03.0-1.00.0-1.0-1.00.00.01.01.01.0-1.00.01.00.00.0-3.0-1.02.01.02.0-1.00.02.00.00.02.02.0
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent10.0100.00.00.0100.0100.0100.00.0100.0100.00.00.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.00.0100.00.00.0100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.01.00.00.02.00.00.00.0-1.00.00.00.06.01.00.00.05.00.00.01.0-3.00.01.00.0-6.00.00.00.0261.0
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent10.050.0-0.00.0-200.00.0-0.0-0.00.00.00.00.0600.0-100.00.00.00.00.0-0.0-100.0-150.00.050.0-0.00.00.00.00.01300.050.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value27-41.03023107-68.00.02143509.0-17.0-18.0-46.0128667746-38.02110310034-127.0-112.0-15.053-42.0824110022
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent10.0-2050.00.00.0-5350.0-2266.7-0.00.0-4300.0-5000.00.00.0-1800.0-4600.012800.0-6600.00.04600.00.00.0-3433.3-10000.01700.0-12700.0-5600.01500.00.0-2100.00.00.05000.01100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value105-155.011289399-256.02.07915719230-60.0-62.0-175.024612314485-72.04118619068-238.0-207.0-28.099-78.01537618640-159.0232-29.0263-47.0241330-305.0142142
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value27-41.03023107-68.00.02143509.0-17.0-18.0-46.0128667746-38.02110310034-127.0-112.0-15.053-42.0824110022-85.01242.089-19.080
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherCostAndExpenseOperating


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5.04.05.05.05.05.06.05.04.08.06.03.03.04.02.03.04.04.02.03.05.02.03.03.03.04.04.03.03.04.03.03.04.05.04.02.04.04.0-1.04.06.04.05.04.03.04.0
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForLossesAndLossAdjustmentExpense


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value767705836779751817808830798824733705695714729725695694650662629562601604598546575639615584576562
Percentage of PaymentsForLossesAndLossAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-09-30
Value12-6.06616-46.01416155.036216.06.05.03.05.01.06.01.00.017-4.0-2.02.00.0-1.0-2.0-4.0-2.0-1.0-1.0-1.0-1.0-2.0-3.01.0-1.0-2.0-2.0-3.01.0
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value761467290335421336397580476289260345467438568353399403529490479496325392657348338390348236365350341325252311299304153289376269338389325431
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesEquity

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesEquity


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7478592692391324112918626130162391101144739313433623112911415016267981907133492682108100115114961587934661201187088
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireFinanceReceivables

us-gaap:PaymentsToAcquireFinanceReceivables


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10.0121710.0176.09.08.09.08.08.09.010.06.0117.09.05.04.03.04.06.04.04.03.03.05.04.05.04.0138.010.08.09.06.09.09.09.07.07.09.010.05.05.07.0
Percentage of PaymentsToAcquireFinanceReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PolicyholderBenefitsAndClaimsIncurredGross us-gaap:StatementBusinessSegments

us-gaap:PolicyholderBenefitsAndClaimsIncurredGross

cinf:ConsolidatedPropertyAndCasualtyInsurance


Policyholder
Period End2021-06-302021-03-312020-06-302020-03-31
Value781868976900
Percentage of PolicyholderBenefitsAndClaimsIncurredGross100.0100.0100.0100.0

cinf:LifeInsurance


Policyholder
Period End2021-06-302021-03-312020-06-302020-03-31
Value10010710085
Percentage of PolicyholderBenefitsAndClaimsIncurredGross12.812.310.29.4

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Policyholder
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1039976900894855866787794792821
Percentage of PolicyholderBenefitsAndClaimsIncurredGross0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:LifeInsuranceSegment


Policyholder
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value851008510087878510082707683738776757280767870727271806880766462646062575365585653605957
Percentage of PolicyholderBenefitsAndClaimsIncurredGross0.010.29.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PremiumsEarnedNetLife us-gaap:StatementBusinessSegments

us-gaap:PremiumsEarnedNetLife

cinf:LifeInsurance


Premiums
Period End2021-06-302021-03-312020-06-302020-03-31
Value79697967
Percentage of PremiumsEarnedNetLife100.0100.0100.0100.0

us-gaap:LifeInsuranceSegment


Premiums
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value727967677067666561646059566057535859585351525351465348653844424838514142434337384140
Percentage of PremiumsEarnedNetLife0.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value390300156193242321253363356269207246281393357275291249351340452368238286408267344194229252219252238221238329165195216201242149129417164176
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-18000000.0-32000000.0-56000000.0-14000000.0-14000000.0-26000000.0-24000000.0-1000000.0-10000000.0-19000000.0-7000000.0-12000000.0-4000000.0-37000000.0-25000000.0-10000000.0-4000000.0-15000000.0-10000000.0-2000000.0-4000000.0-4000000.0-4000000.0-4000000.0-5000000.0-4000000.0-4000000.0-5000000.0-6000000.0-2000000.0-2000000.0-5000000.0-3000000.0-4000000.0-3000000.0-4000000.0-3000000.0-3000000.0-3000000.0-1000000.0-4000000.0-3000000.0-4000000.0-1000000.0-3000000.0-2000000.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfNotesPayable

us-gaap:ProceedsFromRepaymentsOfNotesPayable


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2.03.0-69.01.08.0751.01.05.00.02.0-31.07.0
Percentage of ProceedsFromRepaymentsOfNotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndCollectionOfFinanceReceivables

us-gaap:ProceedsFromSaleAndCollectionOfFinanceReceivables


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10.08.09.0118.07.09.07.06.07.07.06.06.06.06.06.05.06.06.09.07.08.08.07.07.08.08.08.08.07.08.08.07.07.010.08.07.09.07.09.08.06.08.06.08.07.0
Percentage of ProceedsFromSaleAndCollectionOfFinanceReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value433079136621419.0511.0301.00.05.03.08.00.0120.00.01.014186.06.0130.02.00.02412142.01213103226.0245.0142863372574
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesEquity

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesEquity


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4565442492157.09.05211131110159301042332.07221615410376132101201546711014351310.02159985141259912968209133145682931
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProceedsFromStockOptionsExercised


Proceeds
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value4.04.01.00.04.02.02.04.03.02.02.01.04.03.02.02.06.04.04.04.09.010.03.04.07.08.03.03.08.08.05.06.06.04.03.02.01.0
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-1.0-2.0-1.00.0-1.0-1.00.00.0-1.00.00.00.0-1.00.00.0-1.00.0-1.0-1.00.0-1.0-1.0-2.0-1.0-2.0-1.0-3.0-1.00.0-1.07.0-2.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax100.0100.0100.00.0100.0100.00.00.0100.00.00.00.0100.00.00.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value9.03.07.03.00.0-75.01.0-1.0-1.02.0121.02.04.02924.0-10.0159-38.0574261-38.02.05946306517185.020
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax-900.0-150.0-700.00.0-0.07500.00.00.0100.00.00.00.0-200.00.00.0-400.00.0-15900.03800.00.0-4200.0-6100.01900.0-200.0-2950.0-4600.0-1000.0-6500.00.0-1800.071.4-1000.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-1.0-2.0-1.00.0-1.0-1.00.00.0-1.00.00.00.0-1.00.00.00.00.0-1.0-1.00.0-1.00.00.0-1.0-1.0-1.0-2.0-1.00.0-1.04.0-1.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.00.0100.0100.00.00.0100.00.00.00.0100.00.00.00.00.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value8.03.05.03.00.0-59.00.0-1.0-1.01.0-2.01.02.03.0-9.03.0-7.0103-25.0372740-24.01.03830174312112.013
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax-800.0-150.0-500.00.0-0.05900.00.00.0100.00.00.00.0-200.00.00.00.00.0-10300.02500.00.0-2700.00.00.0-100.0-3800.0-3000.0-850.0-4300.00.0-1100.050.0-1300.0

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed us-gaap:StatementBusinessSegments

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed

cinf:ConsolidatedPropertyAndCasualtyInsurance


Reinsurance
Period End2021-06-302021-03-312020-06-302020-03-31
Value54784534
Percentage of ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed100.0100.0100.0100.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Reinsurance
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value54453430372525702613
Percentage of ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded us-gaap:StatementBusinessSegments

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded

cinf:ConsolidatedPropertyAndCasualtyInsurance


Reinsurance
Period End2021-06-302021-03-312020-06-302020-03-31
Value-5.0-23.0-14.0-4.0
Percentage of ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded100.0100.0100.0100.0

cinf:LifeInsurance


Reinsurance
Period End2021-06-302021-03-312020-06-302020-03-31
Value15272112
Percentage of ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded-300.0-117.4-150.0-300.0

srt:ConsolidatedPropertyAndCasualtyInsuranceEntity


Reinsurance
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-22.0-14.0-4.0-89.0-28.0-28.0-22.0-66.0-5.0-13.0
Percentage of ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded0.0100.0100.00.00.00.00.00.00.00.0

us-gaap:LifeInsuranceSegment


Reinsurance
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value13-21.0-12.0334-19.0-14.0-15.0304-16.0-8.01315142711179.01813171314121816122413151420111610.010.0149.0128.0191514
Percentage of ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded0.0150.0300.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312010-12-312010-09-30
Value100000.0400000.0100000.000400000.0100000.0100000.0100000.0400000.0100000.0100000.0100000.0400000.0100000.0100000.0100000.0500000.0200000.0100000.0200000.0500000.0300000.0200000.0200000.0600000.0001000000.0001000000.00000
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.0100.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.0-16.01.00.00.0-16.00.01.01.0-14.00.00.00.0-17.00.00.00.0-18.01.01.00.0-10.02.02.00.0-11.09.010.010.07.09.09.01.00.0-5.00.0-3.0-2.00.00.00.0-2.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.00.00.0100.00.0100.0100.0100.00.00.00.0100.00.00.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.00.00.00.0100.0

us-gaap:TreasuryStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.0123.00.01.0112.03.03.0133.02.02.0144.03.02.0177.06.05.018126.04.0195.00.00.05.00.01.00.01.03.00.00.03.0-1.00.00.03.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised150.0-75.0300.00.00.0-68.80.0300.0300.0-92.90.00.00.0-82.40.00.00.0-94.4700.0600.00.0-180.0600.0300.00.0-172.755.60.00.071.40.011.10.00.0-60.00.0-0.0-150.00.00.00.0-150.0

us-gaap:StockholdersEquityOther us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityOther

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-2000000.0-1000000.010000000.0-1000000.0-2000000.0-1000000.010000000.0-1000000.0-1000000.0-1000000.08000000.0-1000000.0-1000000.0-1000000.08000000.0-2000000.00-1000000.08000000.0-1000000.0-1000000.0-1000000.014000000.0-7000000.0-6000000.04000000.018000000.0-7000000.0-7000000.00-1000000.0-1000000.0-1000000.00-2000000.00-1000000.000-1000000.0-3000000.02000000.0-2000000.0001000000.0
Percentage of StockholdersEquityOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.00.0100.00.00.0100.0100.0100.0100.00.00.0100.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1000000.08000000.0-2000000.00-1000000.05000000.0-1000000.00-1000000.06000000.0-1000000.00-1000000.08000000.0-1000000.0-1000000.0-1000000.08000000.0-1000000.0-1000000.0-1000000.029000000.0-3000000.0-4000000.0-15000000.024000000.0-4000000.0-2000000.0-12000000.0-1000000.0-1000000.0-1000000.0-2000000.0-1000000.0-1000000.0-1000000.0-2000000.0-3000000.0-1000000.0-2000000.0-1000000.0-3000000.0-1000000.0-2000000.0-1000000.0
Percentage of StockholdersEquityOther50.080.0200.0-0.0100.050.0100.0-0.0100.075.0100.0-0.0100.0100.050.00.0100.0100.0100.0100.0100.0207.142.966.7-375.0133.357.128.60.0100.0100.0100.00.050.00.0100.00.00.0100.066.7-50.0150.00.00.0-100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value949103386910821054963880916947857842857852839764835832826768730808723660661724711600647773705608631
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-119.0-110.0-40.0-11.0-47.0-33.0-45.0-52.0-84.0-67.0-44.0-44.0-31.0-48.0-23.0-20.0-38.0-38.0-17.0-40.0-49.0-62.0-44.0-48.0-70.0-22.022-25.0-66.0-29.0-7.0-38.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

cinf:CommercialAutoSegment, cinf:CommercialLinesInsurance


Supplemental
Period End2021-06-302021-03-312020-06-302020-03-31
Value-13.0-24.0-3.06.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense10.921.86.4-18.2

cinf:CommercialCasualtySegment, cinf:CommercialLinesInsurance


Supplemental
Period End2021-06-302020-06-302020-03-31
Value-26.0-21.0-5.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense21.844.715.2

cinf:CommercialPropertySegment, cinf:CommercialLinesInsurance


Supplemental
Period End2021-06-302021-03-31
Value-13.0-21.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense10.919.1

cinf:PersonalAuto, cinf:PersonalLinesInsurance


Supplemental
Period End2021-06-302021-03-312020-06-302020-03-31
Value-9.0-15.0-7.0-13.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense7.613.614.939.4

cinf:WorkersCompensation, cinf:CommercialLinesInsurance


Supplemental
Period End2021-06-302021-03-312020-06-302020-03-31
Value-27.0-25.0-19.0-7.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense22.722.740.421.2

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense us-gaap:Range, us-gaap:StatementBusinessSegments

srt:Maximum, us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine


Supplemental
Period End2020-09-30
Value1.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense-9.1

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense us-gaap:StatementBusinessSegments

cinf:CommercialLinesInsurance


Supplemental
Period End2021-06-302021-03-312020-06-302020-03-31
Value-86.0-83.0-45.0-6.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense72.375.595.718.2

cinf:ExcessandSurplusLinesInsurance


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-1.04.0-1.0-1.08.01.00.0-4.0-5.0-2.0-2.0-8.0-4.0-10.0-4.0-3.0-9.0-13.0-7.0-12.0-1.0-14.0-14.0-7.0-9.0-5.0-6.0-6.0-8.0-9.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense0.8-3.62.59.1-17.0-3.0-0.07.76.03.04.518.212.920.817.415.023.734.241.230.02.022.631.814.612.922.7-27.324.012.131.0

cinf:PersonalLinesInsurance


Supplemental
Period End2021-06-302021-03-312020-06-302020-03-31
Value-12.0-20.00.0-28.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense10.118.2-0.084.8

us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine


Supplemental
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-8.0-45.0-6.0-39.0-33.0-58.0-62.0-43.0-37.0-42.0-35.0-18.0-18.0-26.0-11.0-11.0-31.0-58.0-29.0-34.0-43.0-63.0-14.027-24.0-57.0-3.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense72.795.718.286.763.569.092.597.784.1135.572.978.390.068.428.964.777.5118.446.877.389.690.063.6122.796.086.410.3

us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine


Supplemental
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.00.0-28.0-10.0-6.0-14.03.0-3.00.017-1.0-1.00.0-3.0-10.00.04.010.0-18.04.02.02.0-3.01.05.0-1.0-17.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense-0.0-0.084.822.211.516.7-4.56.8-0.0-54.82.14.3-0.07.926.3-0.0-10.0-20.429.0-9.1-4.2-2.913.64.5-20.01.558.6

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine, cinf:CommercialAutoSegment


Supplemental
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value10.0-3.06.02.0-6.0-11.03.05.0-2.08.09.010.04.0138.04.0111112
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense-90.96.4-18.2-3.87.116.4-6.8-16.14.2-40.0-23.7-26.3-10.0-26.5-12.9-8.3-15.7-50.0-48.0

us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine, cinf:CommercialCasualtySegment


Supplemental
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302015-09-302015-06-302014-09-302014-06-30
Value-10.0-21.0-5.0-8.0-25.0-31.0-20.0-14.05.00.0-7.015-7.0-20.0-16.0-23.0-8.0-24.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense90.944.715.215.429.846.345.545.2-10.4-0.018.4-39.517.540.833.332.932.036.4

us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine, cinf:WorkersCompensation


Supplemental
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value-6.0-19.0-7.0-20.0-27.0-15.0-9.0-18.0-13.0-14.0-12.0-18.0-16.0-23.0-13.0-25.0-41.0-15.0-15.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense54.540.421.238.532.122.420.558.127.170.031.647.440.046.921.052.158.668.260.0

us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine, cinf:Homeowner


Supplemental
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302016-03-312015-03-31
Value1.07.0-18.00.04.0117.014-8.0-7.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense-9.1-14.954.5-0.0-4.8-16.4-15.9-45.212.931.8

us-gaap:PropertyAndCasualtyPersonalInsuranceProductLine, cinf:PersonalAuto


Supplemental
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302016-09-302016-06-30
Value1.0-7.0-13.0-3.0-15.09.014
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense-9.114.939.45.817.9-22.5-28.6

us-gaap:TreasuryStockSharesAcquired us-gaap:StatementEquityComponents

us-gaap:TreasuryStockSharesAcquired

us-gaap:CommonStock


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value0300000.00002500000.0600000.0000001600000.0200000.0300000.00800000.0200000.0500000.0000200000.0400000.0400000.000400000.0
Percentage of TreasuryStockSharesAcquired0.0100.00.00.00.0100.0100.00.00.00.00.00.0100.0100.0100.00.0100.0100.0100.00.00.00.0100.0100.0100.00.00.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStock


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312010-09-30
Value0.0285.00.00.0256625.00.00.00.00.011015220.05515370.02.00.01221200.00.0140.07.0307.06.09.05.07.00.00.02.00.00.0
Percentage of TreasuryStockValueAcquiredCostMethod0.0100.0100.00.00.0100.0100.0100.00.00.00.00.0100.0100.0100.00.0100.0100.0100.00.0100.00.0100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.0

us-gaap:UnrealizedGainLossOnInvestments us-gaap:InvestmentType

us-gaap:UnrealizedGainLossOnInvestments

us-gaap:EquitySecurities


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value489487-711.04751044-1649.0-2710.08935565253450
Percentage of UnrealizedGainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount us-gaap:BusinessAcquisition

us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount

cinf:MSPUnderwritingLimited


Valuation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3.01.02.0154.0
Percentage of ValuationAllowanceDeferredTaxAssetChangeInAmount100.0100.0100.0100.0100.0

us-gaap:WithdrawalFromContractHoldersFunds

us-gaap:WithdrawalFromContractHoldersFunds


Withdrawal
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value42333640434041404944504542464536404337413839473434333533433250232431432134285720222221191717
Percentage of WithdrawalFromContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:AccumulatedOtherComprehensiveIncomeLossTax us-gaap:Restatement, us-gaap:StatementEquityComponents

cinf:AccumulatedOtherComprehensiveIncomeLossTax

srt:ScenarioPreviouslyReported, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Accumulated
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value17421516255123102599.0733
Percentage of AccumulatedOtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:ScenarioPreviouslyReported, us-gaap:AccumulatedOtherComprehensiveIncome


Accumulated
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value1682061605512098567.0730
Percentage of AccumulatedOtherComprehensiveIncomeLossTax96.695.898.8100.097.696.194.977.899.6

cinf:AccumulatedOtherComprehensiveIncomeLossTax us-gaap:StatementEquityComponents

cinf:AccumulatedNetUnrealizedGainLossOnDeferredCostsReservesAndOther


Accumulated
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-31
Value-2.0-2.0-2.00.0-3.0-2.0-2.0-1.00.00.00.0-1.0-2.0-3.0-2.0-2.0-3.0-3.0-3.00.01.0-1.0-2.0-4.0-3.0-3.0-5.0-5.0-5.0-7.0-9.0-17.0-10.0
Percentage of AccumulatedOtherComprehensiveIncomeLossTax-0.90.0-1.20.0-2.40.0-2.0-1.70.00.00.00.0-0.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Accumulated
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-31
Value-6.0-6.0-7.00.00.00.0-2.0-2.0-2.0-2.0-1.0-1.0-1.0-1.0-7.0-8.0-8.0-8.0-13.0-13.0-13.0-14.0-11.0-11.0-12.0-12.0-6.0-6.0-6.0-6.0-32.0-33.0-35.0-31.0
Percentage of AccumulatedOtherComprehensiveIncomeLossTax0.0-3.4-3.30.00.00.00.0-2.0-3.4-22.20.00.00.0-0.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-31
Value20117421518516255123123102599.00.0173573310971031954908946925822722688815927942889931849808708686647512
Percentage of AccumulatedOtherComprehensiveIncomeLossTax0.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value1951682061831605512011998567.0-1.0163373010871021944897930909809709676802911927880920838797669644720595618530550471
Percentage of AccumulatedOtherComprehensiveIncomeLossTax0.096.695.80.098.8100.097.60.096.194.977.80.00.00.099.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cinf:AsbestosAndEnvironmentalReinsuranceRetention us-gaap:Range

cinf:AsbestosAndEnvironmentalReinsuranceRetention

srt:Maximum


Asbestos
Period End2020-12-31
Value500000.0
Percentage of AsbestosAndEnvironmentalReinsuranceRetention100.0

cinf:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAverage

cinf:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAverage


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value30.532.433.934.6
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAverage100.0100.0100.0100.0

cinf:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAverage

cinf:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAverage


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value30.730.930.028.8
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAverage100.0100.0100.0100.0

cinf:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAverage

cinf:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAverage


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value34.731.931.331.6
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAverage100.0100.0100.0100.0

cinf:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAverage

cinf:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAverage


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value4.14.84.85.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAverage100.0100.0100.0100.0

cinf:AvailableForSaleSecuritiesEquitySecuritiesCost

cinf:AvailableForSaleSecuritiesEquitySecuritiesCost


Available
Period End2020-12-312019-12-312018-12-312017-12-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value39273581336830943218324029953169318929992938297028282748272826972582254525232471245224162369231522482158216221322115222322862016
Percentage of AvailableForSaleSecuritiesEquitySecuritiesCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:AvailableForSaleSecuritiesEquitySecuritiesCost us-gaap:ConsolidatedEntities

srt:ParentCompany


Available
Period End2020-12-312019-12-312018-12-31
Value160714271282
Percentage of AvailableForSaleSecuritiesEquitySecuritiesCost40.939.838.1

cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLoss3 us-gaap:FinancialInstrument, us-gaap:InvestmentType

cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLoss3

us-gaap:CommercialMortgageBackedSecurities, us-gaap:DebtSecurities


Availableforsale
Period End2021-03-312020-06-302020-03-312019-12-312018-12-31
Value1.00.00.00.02.0
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLoss3100.00.00.00.0100.0

us-gaap:CorporateBondSecurities, us-gaap:DebtSecurities


Availableforsale
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value1.03.02.04.01.05.03.09.036
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLoss30.0300.00.00.00.00.00.00.01800.0

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:DebtSecurities


Availableforsale
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302018-12-31
Value1.01.01.01.00.00.013
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLoss30.0100.00.00.00.00.0650.0

cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLoss3 us-gaap:InvestmentType

us-gaap:DebtSecurities


Availableforsale
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value2.05.02.04.02.06.03.09.058
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLoss30.0500.00.00.00.00.00.00.02900.0

cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss3 us-gaap:FinancialInstrument, us-gaap:InvestmentType

cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss3

us-gaap:CommercialMortgageBackedSecurities, us-gaap:DebtSecurities


Availableforsale
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value1.01.02.03.08.00.02.0
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss3100.0100.0100.0100.0100.00.0100.0

us-gaap:CorporateBondSecurities, us-gaap:DebtSecurities


Availableforsale
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value2.0117.027471815.01387
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss30.01100.0700.01350.01566.72262.50.00.04350.0

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:DebtSecurities


Availableforsale
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value2.07.02.03.03.06.01.00.031
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss30.0700.0200.0150.0100.075.00.00.01550.0

cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss3 us-gaap:InvestmentType

us-gaap:DebtSecurities


Availableforsale
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value4.01910.032531957.013128
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss30.01900.01000.01600.01766.72437.50.00.06400.0

cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLoss3 us-gaap:FinancialInstrument, us-gaap:InvestmentType

cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLoss3

us-gaap:CommercialMortgageBackedSecurities, us-gaap:DebtSecurities


Availableforsale
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value1.02.03.08.00.00.0
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLoss3100.0100.0100.0100.00.00.0

us-gaap:CorporateBondSecurities, us-gaap:DebtSecurities


Availableforsale
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value1.08.05.023461762.04.051
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLoss30.00.0500.01150.01533.32200.00.00.00.0

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:DebtSecurities


Availableforsale
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value1.06.02.03.02.05.01.00.018
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLoss30.00.0200.0150.066.762.50.00.00.0

cinf:AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLoss3 us-gaap:InvestmentType

us-gaap:DebtSecurities


Availableforsale
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value2.0148.028511894.04.070
Percentage of AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLoss30.00.0800.01400.01700.02362.50.00.00.0

cinf:DeferredTaxLiabilitiesPolicyLiabilitiesLife

cinf:DeferredTaxLiabilitiesPolicyLiabilitiesLife


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value12112011711116213711086654226
Percentage of DeferredTaxLiabilitiesPolicyLiabilitiesLife100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments

cinf:DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1240995542740907719937807605481411
Percentage of DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:ExcessofSeparateAccountFairValueoverAccountValue

cinf:ExcessofSeparateAccountFairValueoverAccountValue


Excessof
Period End2020-12-312019-12-312018-12-31
Value9952-3.0
Percentage of ExcessofSeparateAccountFairValueoverAccountValue100.0100.0100.0

cinf:LargestSingleCommonStockHolding

cinf:LargestSingleCommonStockHolding


Largest
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value665593644562414
Percentage of LargestSingleCommonStockHolding100.0100.0100.0100.0100.0

cinf:Largestequityholdingstototalequityportfolio

cinf:Largestequityholdingstototalequityportfolio


Largestequityholdingstototalequityportfolio
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value7.06.67.57.45.5
Percentage of Largestequityholdingstototalequityportfolio100.0100.0100.0100.0100.0

cinf:Largestequityholdingstototalportfolio

cinf:Largestequityholdingstototalportfolio


Largestequityholdingstototalportfolio
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value2.92.73.02.82.1
Percentage of Largestequityholdingstototalportfolio100.0100.0100.0100.0100.0

cinf:NumberOfSecuritiesContinuousUnrealizedLossPosition us-gaap:InvestmentType

cinf:NumberOfSecuritiesContinuousUnrealizedLossPosition

us-gaap:DebtSecurities


Number
Period End2021-06-302021-03-312020-12-312020-09-30
Value108.0296.0128.0254.0
Percentage of NumberOfSecuritiesContinuousUnrealizedLossPosition100.0100.0100.0100.0

cinf:PercentageOfPremiums us-gaap:MajorCustomers

cinf:PercentageOfPremiums

cinf:LargestCustomer


Percentage
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1.30.0130.0080.00800.010.0080.0080.0090.012
Percentage of PercentageOfPremiums100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

cinf:PercentageOfPremiums us-gaap:MajorCustomers, us-gaap:Range

cinf:AllOther, srt:Maximum


Percentage
Period End2020-12-312019-12-31
Value4.00.04
Percentage of PercentageOfPremiums307.7307.7

cinf:PercentageOfPremiums us-gaap:Range, us-gaap:StatementGeographical

srt:Maximum, cinf:OtherState


Percentage
Period End2020-12-312019-12-31
Value6.00.06
Percentage of PercentageOfPremiums461.5461.5

srt:Minimum, cinf:OtherState


Percentage
Period End2020-12-312019-12-31
Value4.00.04
Percentage of PercentageOfPremiums307.7307.7

cinf:PercentageOfPremiums us-gaap:StatementGeographical

cinf:State


Percentage
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value53.30.5480.5840.5970.610.620.6280.6380.6540.6650.671
Percentage of PercentageOfPremiums4100.04215.47300.07462.50.06200.07850.07975.07266.75541.70.0

stpr:OH


Percentage
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value14.80.1510.1590.16200.170.1770.185
Percentage of PercentageOfPremiums1138.51161.51987.52025.00.01700.02212.52312.5

cinf:PercentageOfReservesForAsbestosAndEnvironmentalClaims

cinf:PercentageOfReservesForAsbestosAndEnvironmentalClaims


Percentage
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2.00.020.020.020.0180.0190.020.0190.0180.0350.035
Percentage of PercentageOfReservesForAsbestosAndEnvironmentalClaims100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cinf:PremiumReceivableAllowanceForCreditLossPropertyCasualtyPremiumsReceivable

cinf:PremiumReceivableAllowanceForCreditLossPropertyCasualtyPremiumsReceivable


Premium
Period End2020-12-31
Value9000000.0
Percentage of PremiumReceivableAllowanceForCreditLossPropertyCasualtyPremiumsReceivable100.0

cinf:ReinsuranceRecoverable

cinf:ReinsuranceRecoverable


Reinsurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value504511517533528567610
Percentage of ReinsuranceRecoverable100.0100.0100.0100.0100.0100.0100.0

cinf:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValueAggregate us-gaap:AwardType, us-gaap:DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensation

cinf:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValueAggregate

cinf:ServiceBasedShares, us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value30252423232614151.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValueAggregate100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PerformanceShares, us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value5.02.06.07.06.06.03.03.02.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValueAggregate16.78.025.030.426.123.121.420.0200.0

dei:EntityCommonStockSharesOutstanding

dei:EntityCommonStockSharesOutstanding


Entity
Period End2021-07-232021-04-232021-02-192020-10-22
Value161161161160
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0

srt:LifeInsuranceInForceCeded

srt:LifeInsuranceInForceCeded


Life
Period End2020-12-312019-12-312018-12-312017-12-31
Value38281381463858438711
Percentage of LifeInsuranceInForceCeded100.0100.0100.0100.0

srt:LifeInsuranceInForceGross

srt:LifeInsuranceInForceGross


Life
Period End2020-12-312019-12-312018-12-312017-12-31
Value11175610813010472699888
Percentage of LifeInsuranceInForceGross100.0100.0100.0100.0

srt:LifeInsuranceInForceNet

srt:LifeInsuranceInForceNet


Life
Period End2020-12-312019-12-312018-12-312017-12-31
Value73475699846614261177
Percentage of LifeInsuranceInForceNet100.0100.0100.0100.0

us-gaap:AccruedEmployeeBenefitsCurrentAndNoncurrent us-gaap:RetirementPlanType

us-gaap:AccruedEmployeeBenefitsCurrentAndNoncurrent

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Accrued
Period End2020-12-312019-12-312018-12-312017-12-31
Value10.01110.09.0
Percentage of AccruedEmployeeBenefitsCurrentAndNoncurrent100.0100.0100.0100.0

us-gaap:AccruedInvestmentIncomeReceivable

us-gaap:AccruedInvestmentIncomeReceivable


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value138134136131131124133125130128132129130124134128130123134121126121129119122123123119116116121115116117115116118116119117120117119118
Percentage of AccruedInvestmentIncomeReceivable