AWK


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

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:SharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:InterestIncomeExpenseNonoperatingNet
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingExpenses
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingIncomeLoss

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ProfitLoss

us-gaap:RegulatedAndUnregulatedOperatingRevenue
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:Assets
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryRawMaterialsAndSupplies

us-gaap:OtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:TaxesPayableCurrent

us-gaap:LongTermDebt
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FairValueByMeasurementBasis

us-gaap:DebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent
us-gaap:FinancialInstrument
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt
dei:LegalEntity, us-gaap:LongtermDebtType
us-gaap:DebtInstrument

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:Dividends
us-gaap:StatementEquityComponents

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

awk:AccountsReceivableAllowanceForCreditLossAssetsHeldForSale
us-gaap:StatementBusinessSegments
awk:AlternativeRevenuePrograms

awk:BenefitCostsNonOperatingNet

awk:ContractWithCustomerLiabilityRevenueRecognizedDuringThePeriod

awk:ContractwithCustomerAssetAdditions

awk:ContractwithCustomerLiabilityAdditions
us-gaap:RetirementPlanType
awk:DefinedBenefitPlanNetPeriodicBenefitCostCreditBeforeSettlements

awk:OperatingandFinancingLeaseExpenses

awk:OperatingandFinancingLeasePayments
dei:LegalEntity
awk:PaymentsOfMakeWholePremiumOnEarlyDebtRedemption

awk:ProceedsFromIssuancesOfEmployeeStockPlansAndDirectStockPurchasePlanNet
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
awk:ProceedsReceivedFromPaymentDueToTerminatedForwardSwaps

awk:ProceedsRepaymentFromTermLoan

awk:ProceedsfromTermLoan

awk:PublicUtilitiesGeneralRateCaseAuthorizations
us-gaap:StatementGeographical
us-gaap:StatementGeographical
awk:PublicUtilitiesGeneralRateCaseAuthorizationsAdditionalAnnualizedRevenue
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
us-gaap:StatementGeographical
awk:PublicUtilitiesInfrastructureChanges
us-gaap:StatementGeographical, us-gaap:SubsequentEventType

awk:PublicUtilitiesInfrastructureSurchargeAuthorizations
us-gaap:StatementGeographical
us-gaap:StatementGeographical
awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedCatchUpPeriodAmount
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
us-gaap:StatementGeographical
awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedPayableToCustomers
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
us-gaap:StatementGeographical
awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedPayableToCustomers
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
us-gaap:StatementGeographical
awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesReductionInRevenue
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
us-gaap:StatementGeographical
awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesUnprotectedPayableToCustomers
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
awk:PublicUtilitiesRequestedInfrastructureSurchargeAmount
us-gaap:StatementGeographical
awk:PublicUtilitiesRequestedRateAdjustmentAmount

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs

us-gaap:BusinessCombinationConsiderationTransferred1
us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:SubsequentEventType

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ContractWithCustomerAssetReclassifiedToReceivable

us-gaap:DeferredIncomeTaxesAndTaxCredits
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanContributionsByEmployer
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:Range, us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInReceivables
us-gaap:StatementBusinessSegments
us-gaap:LeaseIncome
dei:LegalEntity, us-gaap:LitigationCase
us-gaap:LitigationSettlementAmountAwardedToOtherParty
us-gaap:LitigationCase

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax

us-gaap:OtherNoncashIncomeExpense

us-gaap:PaymentsForProceedsFromRemovalCosts

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PensionAndOtherPostretirementBenefitContributions

us-gaap:PensionAndOtherPostretirementBenefitExpense

us-gaap:ProceedsFromAdvancesForConstruction

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess

us-gaap:ProceedsFromSaleOfProductiveAssets
dei:LegalEntity, us-gaap:CreditFacility
us-gaap:ProceedsFromShortTermDebt

us-gaap:ProvisionForDoubtfulAccounts
us-gaap:StatementGeographical
us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount
us-gaap:StatementGeographical
us-gaap:PublicUtilitiesRequestedRateIncreaseDecreaseAmount
us-gaap:StatementGeographical, us-gaap:SubsequentEventType

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:RepaymentsOfConstructionLoansPayable
dei:LegalEntity, us-gaap:DebtInstrument
us-gaap:RepaymentsOfDebt
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentRedemptionPeriod
dei:LegalEntity, us-gaap:CreditFacility
us-gaap:RepaymentsOfShortTermDebt

us-gaap:RevenueNotFromContractWithCustomerOther
us-gaap:ProductOrService
us-gaap:StatementBusinessSegments

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations

us-gaap:UtilitiesOperatingExpenseTaxes

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

awk:AdvancesforConstruction

awk:BusinessAcquisitionAdditionalGoodwill
us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:StatementBusinessSegments
us-gaap:BusinessAcquisition
awk:BusinessCombinationDepositPaid
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:BusinessAcquisition
awk:BusinessCombinationNumberOfCustomersInService
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:ProductOrService, us-gaap:BusinessAcquisition

awk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContributionsInAidOfConstruction
us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType

awk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebt
us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType

awk:CashCashEquivalentsAndShortTermDebtLiquidity

awk:CommercialPaperAndLineOfCreditFacilityOutstanding

awk:CommercialPaperAndLineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:CreditFacility

awk:CommercialPaperOutstanding

awk:CommercialPaperRemainingBorrowingCapacity
dei:LegalEntity
awk:CommercialPaperWeightedAverageInterestRateEndOfPeriod

awk:DebtInstrumentUnamortizedDiscountPremiumFairValueNet
us-gaap:BalanceSheetLocation
awk:DeferredIncomeTaxAssetsInvestmentTaxCredit

awk:DeferredIncomeTaxLiabilitiesAssetsHeldForSale

awk:DeferredIncomeTaxLiabilitiesNetandInvestmentTaxCredits

awk:DeferredTaxAssetsAdvancesAndContributions

awk:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits

awk:DeferredTaxLiabilitiesDeferredPensionAndOtherPostretirementBenefits

awk:DeferredTaxLiabilitiesandInvestmentTaxCreditsNoncurrent
us-gaap:RegulatoryAsset
awk:DefinedBenefitPlanRegulatoryAssetsUnderfundedStatus

awk:DepositAssetsFairValue
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
awk:DisposalGroupIncludingDiscontinuedOperationCashAccountsReceivableInventoryAssetCurrent

awk:DisposalGroupIncludingDiscontinuedOperationPublicNonUtilitiesPropertyPlantAndEquipment
us-gaap:PublicUtility
awk:DisposalGroupIncludingDiscontinuedOperationPublicUtilitiesPropertyPlantandEquipment

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryAssets
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryAssetsCurrent

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilities
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilitiesCurrent

awk:EstimatedCapitalExpendituresUnderLegalAndBindingContractualObligations

awk:IntangibleAssetsNoncurrent

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueAfterYearFive

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueAfterYearFour

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearFive

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearFour

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearOne

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearThree

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearTwo

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsRemainderOfFiscalYear

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsDue

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsDueYearFive

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsDueafterYearFive

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsRemainderofFiscalYear

awk:LesseeOperatingandFinancingLeaseLiabilityUndiscountedExcessAmount
us-gaap:RetirementPlanType
awk:LiabilityDefinedBenefitPensionPlanNoncurrentAssetsLiabilitiesHeldForSale

awk:LongTermDebtIncludesRedeemablePreferredStockAtRedemptionValue

awk:OperatingandFinancingLeaseLiability

awk:OtherInvestmentsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

awk:PreferredStocksWithMandatoryRedemptionRequirementsCarryingAmount
us-gaap:FairValueByMeasurementBasis

awk:PrepaidPostRetirementAssetsNoncurrent

awk:PublicNonUtilitiesPropertyPlantAndEquipmentPlantForInternalOperations
dei:LegalEntity, us-gaap:StatementGeographical, us-gaap:RegulatoryAgency
awk:PublicUtilitiesAllowanceForFundsUsedDuringConstruction
us-gaap:StatementGeographical
awk:PublicUtilitiesApprovedIncreaseInRateGeneralRateCaseForAnnualizedRevenues
us-gaap:StatementGeographical
awk:PublicUtilitiesApprovedInfrastructureSurchargeForAnnualizedRevenues
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
us-gaap:StatementGeographical
awk:PublicUtilitiesRequestedGeneralRateCaseForAnnualizedRevenues
us-gaap:StatementGeographical
awk:PublicUtilitiesRequestedInfrastructureSurchargeForAnnualizedRevenues
dei:LegalEntity, us-gaap:StatementGeographical, us-gaap:RegulatoryAgency
awk:PublicUtilityAggregateCosts

awk:RabbiTrustInvestments
us-gaap:FairValueByFairValueHierarchyLevel

awk:RedeemableDebtAmountOutstanding

awk:RegulatoryAssetEarnedRevenuePercentage

awk:RegulatoryandOtherLongtermLiabilities

awk:RepaymentOfAdvancesForConstruction

awk:ShortTermDebtLiquidlyAmount

us-gaap:AccrualForEnvironmentalLossContingencies
us-gaap:RetirementPlanType
us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:CapitalizationLongtermDebtAndEquity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:CapitalizedComputerSoftwareNet
us-gaap:StatementClassOfStock
us-gaap:CommonStockCapitalSharesReservedForFutureIssuance

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:ContributionsInAidOfConstruction

us-gaap:DebtInstrumentCarryingAmount
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities, us-gaap:FinancialInstrument, us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms

us-gaap:DebtWeightedAverageInterestRate
dei:LegalEntity

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsRegulatoryAssetsAndLiabilities

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
us-gaap:CollectiveBargainingArrangement, us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount
us-gaap:CollectiveBargainingArrangement, us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeAverageFixedInterestRate
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationAccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities

us-gaap:DisposalGroupIncludingDiscontinuedOperationGoodwill1
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationGoodwillCurrent

us-gaap:DisposalGroupIncludingDiscontinuedOperationOtherAssets
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities

us-gaap:DisposalGroupIncludingDiscontinuedOperationOtherLiabilities

us-gaap:DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisObligations
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueNetAssetLiability
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:GoodwillGross
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:LitigationCase
us-gaap:InsuranceSettlementsReceivable

us-gaap:InterestPayableCurrent
us-gaap:FinancialInstrument
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
dei:LegalEntity
us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:LiabilitiesOtherThanLongtermDebtNoncurrent
us-gaap:CreditFacility, us-gaap:ShortTermDebtType
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtFairValue
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtWeightedAverageInterestRate
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities, us-gaap:FinancialInstrument, us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms

us-gaap:LossContingencyAccrualAtCarryingValue
us-gaap:LitigationCase
us-gaap:Range
us-gaap:LossContingencyEstimateOfPossibleLoss

us-gaap:MandatorilyRedeemablePreferredStockFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PreferredStockRedemptionAmount
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsAfterYearFive
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsYearFive1
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsYearFour1
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsYearThree1
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsYearTwo1

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentNet

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentPlantInService

us-gaap:RegulatedEntityOtherAssetsNoncurrent

us-gaap:RegulatoryAssetsNoncurrent
us-gaap:RegulatoryAsset
us-gaap:UnusualRiskOrUncertaintyByNature

us-gaap:RegulatoryLiabilities

us-gaap:RegulatoryLiabilityNoncurrent
us-gaap:RegulatoryLiability
us-gaap:UnusualRiskOrUncertaintyByNature

us-gaap:RestrictedCashAndCashEquivalents
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
us-gaap:MajorCustomers, us-gaap:StatementBusinessSegments
us-gaap:RevenueRemainingPerformanceObligation
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShortTermBorrowings

us-gaap:StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased

us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:UnbilledReceivablesCurrent

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Other Nonoperating Income Expense
Balance Sheet
Cash And Cash Equivalents At Carrying Value
Assets
Cash And Cash Equivalents At Carrying Value
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Operating Lease Right Of Use Asset
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Liabilities Current
Current Liabilities
Taxes Payable Current
Noncurrent Liabilities
Operating Lease Liability Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Common Stock Dividends Per Share Declared
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Diluted Shares Outstanding
NonoperatingIncomeExpense
Nonoperating Income Expense
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

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 ███████████████████████▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁2.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.01.8071.8011.7991.7951.7931.7911.791.7841.7811.7791.7771.771.7671.7631.7621.7571.7551.7541.7531.75NANANA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock██████▇▇▇▇▇▇▇▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁186.8186.7186.5186.4186.4186.2185.9185.9185.7185.6185.4185.3185.2182.7182.5182.4182.3182.2181.8181.7181.6181.4180.9180.677180.112179.921179.462179.265179.141178.976178.379178.121177.943177.674176.988176.748176.317176.2175.664175.508175.438175.347174.996174.86174.748NA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▄▄182.0182.0NA182.0181.0181.0NA181.0181.0181.0NA181.0179.0179.0NA179.0179.0179.0NA178.0178.0179.0NA180.353180.371180.295NA179.948179.693179.457NA179.154178.91178.465NA177.841177.491177.028NA176.593176.419176.048NA175.062174.85174.796
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁182.0181.0NA181.0181.0181.0NA181.0181.0181.0NA181.0179.0178.0NA178.0178.0178.0NA178.0178.0178.0NA179.578179.564179.458NA178.992178.863178.539NA177.965177.716177.327NA176.621176.331175.914NA175.547175.469175.259NA174.859174.774174.72
us-gaap:EarningsPerShareBasic ▆▅▅█▆▄▄▇▆▄▄▆▅▄▁▆▅▄▄▅▅▃▄▆▄▃▄▅▄▃▃▅▄▃▃▅▄▂▃▅▃▂▂▄▃▂1.140.730.81.460.970.690.541.330.940.620.621.040.90.6-0.011.140.740.520.570.830.770.460.550.970.690.450.520.850.610.380.330.850.570.320.310.870.610.240.370.780.480.270.230.710.420.18
us-gaap:EarningsPerShareDiluted ▆▄▅█▆▄▄▇▆▄▄▆▅▄▁▆▄▃▄▅▅▃▄▆▄▃▃▅▄▃▃▅▄▃▂▅▄▂▃▅▃▂▂▄▃▂1.140.730.81.460.970.680.541.330.940.620.621.040.910.590.01.130.730.520.570.830.770.460.550.960.680.440.520.850.610.380.330.840.570.320.310.860.610.240.370.780.480.270.230.710.420.18
  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,awk:MarketBasedBusinesses█▇▇▇▆▆▇▇▆▇▇▆▄▃▄▃▃▃▄▄▄▄▆▅▃▁▃▂146.0137.0141.0139.0132.0128.0137.0136.0132.0134.0137.0125.0114.0100.0116.0100.0103.0103.0113.0109.0115.0114.0126.178120.373100.087.0101.14396.98NANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,awk:RegulatedBusiness▆▄▅█▅▃▄▇▄▂▃▆▄▂▃▆▄▂▃▅▃▁▂▅▃▁▁▄857.0755.0787.0945.0803.0720.0771.0883.0755.0685.0717.0857.0744.0666.0711.0842.0746.0659.0695.0826.0716.0634.0660.05780.729687.0615.0634.554753.701NANANANANANANANANANANANANANANANANANA
  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
 TTM Greenblatt ROC _ _▅▃▄█▅▃▃▇▅▃▄▆▅▃▄█▅▃▄▅▅▃▃▆▄▂▃▆▄▂▃▅▃▁▂▅▄▁▂▄▂▁▁330.0229.0263.0433.0313.0239.0224.0406.0302.0238.0248.0335.0302.0217.0279.0430.0308.0227.0248.0319.0299.0214.0232.0361.283277.561204.301223.061337.285253.774186.096215.854323.875241.887164.233166.963327.64270.632159.738177.083281.317201.16144.873149.444NANANA
  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:ComprehensiveIncomeNetOfTax ▆▄▄█▆▄▄▇▅▄▅▆▅▄▁▆▄▃▄▅▄▃▃▆▄▃▂▅▄▃▄▅▄▂▂▅▄▂▁▅▃▂▂▄▃▂209.0134.0134.0265.0178.0119.0108.0241.0170.0100.0138.0196.0168.0110.07.0201.0128.097.0114.0145.0128.083.090.0175.0124.52580.40847.575150.914109.77967.607134.959153.232103.08159.54830.794156.195108.68543.88211.171137.56385.82848.8229.794125.57473.40832.282
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▅▂▃█▄▂▁▇▄▂▂▅▄▁▃█▄▁▂▅▄▁▂▆▃▁▂▅▃251.0155.0181.0352.0232.0159.0136.0318.0227.0152.0170.0255.0222.0140.0201.0340.0226.0145.0166.0243.0225.0136.0157.786287.085203.627133.0149.332263.813182.503NANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▂▁▂▄▂▂▂▃▂▂▃▃▃▂█▆▄▂▃▄▄▂▃▅▃▂▂▄▃▂▂▄▃▁▂▄▃▂▂▃▂▁▂▃▂▁44.022.036.088.056.035.038.078.057.039.058.070.060.034.0202.0137.095.052.065.095.088.054.058.798113.19180.55253.45955.2107.20572.1944.88340.25598.32766.45631.16840.1100.91380.60235.39341.08278.35451.1628.64940.96775.76246.5718.669
us-gaap:InterestIncomeExpenseNonoperatingNet ▁▂▂▂▁▂▂▂▃▃▄▄▅▆▆▄▅▅▆▆▆▇▇▇██-101.0-98.0-99.0-99.0-101.0-96.0-98.0-97.0-94.0-93.0-91.0-89.0-86.0-84.0-83.0-89.0-85.0-85.0-83.0-81.0-81.0-80.0-80.0-77.0-76.0-75.0NANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestIncomeExpenseNonoperatingNet us-gaap:ConsolidationItems us-gaap:CorporateNonSegment▁▂▂▂▂▂▂▃▄▄▄▆▆▇▇▄▆▆▆▆▆▇▆█▇█-28.0-26.0-26.0-27.0-27.0-25.0-26.0-24.0-21.0-21.0-21.0-18.0-19.0-16.0-16.0-23.0-19.0-19.0-19.0-17.0-19.0-16.0-18.0-14.0-16.0-14.0NANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestIncomeExpenseNonoperatingNet us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,awk:MarketBasedBusinesses▁▁▃▃▃▆█▆▆▆▆▃█▆▆▆▆▃▆▃▆-1.0-1.00.00.00.01.02.01.01.01.01.00.02.01.01.01.01.00.01.00.01.0NA1.00.01.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestIncomeExpenseNonoperatingNet us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,awk:RegulatedBusiness▂▃▂▂▁▂▁▁▁▂▃▃▄▄▄▅▅▅▆▆▇▆▇▇██-72.0-71.0-73.0-72.0-74.0-72.0-74.0-74.0-74.0-73.0-71.0-71.0-69.0-69.0-68.0-67.0-67.0-66.0-65.0-64.0-63.0-64.0-63.0-63.0-61.0-61.0NANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▆▅▅█▆▄▄▇▆▄▄▆▅▄▁▆▄▃▄▅▅▃▄▆▄▃▃▅▄▃▃▅▄▃▂▅▄▂▃▅▃▂▂▄▃▂207.0133.0145.0264.0176.0124.098.0240.0170.0113.0112.0187.0162.0106.0-1.0203.0131.093.0101.0148.0137.082.099.0174.0123.07580.04393.501152.185109.29968.12359.693150.665101.26357.64355.478153.812107.02641.75464.848137.42284.56647.33240.154124.11472.75130.808
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic 207.0NANANA176.0NANANANANANANANANANANANANANANANANANA173.843123.0480.02593.479152.142109.26668.10359.671150.605101.2257.62355.458153.746106.97941.73840.279137.36184.52626.22240.139124.07172.727NA
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted 207.0NANANA176.0NANANANANANANANANANANANANANANANANANA173.875123.05680.0393.487152.168109.28268.10859.674150.646101.24157.64355.443153.792107.00741.73840.277137.40584.54726.21740.139124.10172.738NA
us-gaap:NonoperatingIncomeExpense ▇█▆▆▆▇▅▅▇▆▇▇▇▇▇▅▆▆▆▇█▇▇▇██████▁▇▇▇███▇▇▇▇▇▇██▇-79.0-74.0-82.0-81.0-81.0-80.0-88.0-88.0-75.0-86.0-78.0-80.0-80.0-77.0-78.0-90.0-82.0-82.0-82.0-76.0-74.0-78.0-74.069-74.198-73.934-70.799-73.915-73.472-72.285-73.09-115.906-74.883-74.168-75.422-72.639-72.616-73.367-75.093-74.917-74.558-75.347-74.76-77.451-71.409-73.693-76.3
us-gaap:OperatingExpenses █▇▇▇▆▆█▆▅▅▆▇▄▄▄▃▄▄▄▆▄▄▄▄▃▃▃▃▃▃▃▃▂▂▃▃▂▁▁▂▂▂▆▂▁▁669.0659.0660.0646.0618.0605.0678.0607.0580.0575.0602.0641.0551.0544.0542.0506.0536.0529.0554.0611.0528.0529.0550.74534.923504.56493.777508.317508.884505.385495.85496.406505.321482.378471.904513.95504.175474.975458.816446.576485.133473.088466.063599.11482.425446.626442.113
us-gaap:OperatingIncomeLoss ▆▃▄█▅▄▃▇▅▄▄▆▅▃▅█▅▃▄▅▅▃▃▆▄▃▃▆▄▂▃▆▄▂▂▆▄▂▂▅▃▁▂▄▂▁330.0229.0263.0433.0313.0239.0224.0406.0302.0238.0248.0335.0302.0217.0279.0430.0308.0227.0248.0319.0299.0214.0232.0361.283277.561204.301223.061337.285253.774186.096215.854323.875241.887164.233166.963327.64270.632159.738177.083281.317201.16144.873149.444266.528188.284124.649
us-gaap:OtherComprehensiveIncomeLossNetOfTax NA1.0-11.01.02.0-5.010.01.00.0-13.026.09.06.04.08.0-2.0-3.04.013.0-3.0-9.01.0-8.6930.8781.450.365-45.926-1.2710.48-0.51675.2662.5671.8181.905-24.6842.3831.6592.128-29.1220.141NANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncomeNA1.0NA1.02.0-5.0NA1.0NA-13.026.09.06.04.08.0-2.0-3.04.013.0-3.0-9.01.0-8.6930.8781.450.365-45.926-1.2710.48-0.51675.2662.5671.8181.905-24.6842.3831.6592.128-29.1220.141NANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▃▄▄▄▅▃▆▄█▃▄▄▄▄▄▄▃▃▂▄▅▃█▂▂▃▂▂▂▁▁▂▂▂▂▂▂▂▂▂▂▂▃▂▃▂3.04.05.06.08.03.010.05.015.03.05.06.04.04.06.05.03.03.01.05.07.02.014.445-0.189-1.0121.756-0.605-0.733-0.317-1.541-2.564-0.449-0.256-0.776-0.6840.0390.335-0.616-0.5780.0130.679-1.1412.0940.5051.9870.069
us-gaap:ProfitLoss NA133.0145.0264.0176.0124.098.0240.0170.0113.0112.0185.0162.0106.0-1.0203.0131.093.0101.0148.0137.082.098.988173.894123.080.093.393152.185NANANANANANANANANANANANANANANANANANA
us-gaap:RegulatedAndUnregulatedOperatingRevenue ▇▅▆█▆▅▆▇▅▄▅▇▅▄▄▆▅▄▄▆▅▃▄▆▄▃▃▅▄▃▃▅▃▂▃▅▃▂▂▄▂▂▂▃▂▁999.0888.0923.01079.0931.0844.0902.01013.0882.0813.0850.0976.0853.0761.0821.0936.0844.0756.0802.0930.0827.0743.0783.0896.206782.121698.0731.0846.169754.778679.0712.26829.196724.265636.137680.913831.815745.607618.554639.779766.45674.248610.936625.773748.953634.91566.762
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax ▇▅▆█▆▅▆▇▅▄▅▆▅▄▅▆▅▄▄▆▅▃▄▆▄▃▃▅▄▃▃▅▃▂▃▅▃▂▂▄▂▂▂▄▂▁990.0878.0923.01074.0908.0834.0902.01013.0863.0804.0850.0955.0840.0756.0821.0936.0844.0756.0802.0930.0827.0743.0783.0896.206782.121698.0731.0846.169754.778679.0712.26829.196724.265636.137680.913831.815745.607618.554639.779766.45674.248610.936625.773748.953634.91566.762
  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 ████▇▇▇▆▆▆▆▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▂▁▁▁▁▁▁24952.024525.024766.024394.024009.023546.022682.022238.021854.021464.021223.020880.020471.019728.019482.019361.018966.018610.018482.017971.017706.017417.017241.017105.17316732.33216263.53116130.95615715.64715426.44715274.82115069.53315228.44614977.37714769.21614718.97614599.53514412.76114087.73914776.39114538.73314347.21614128.80714079.77313983.67513773.516NA
us-gaap:LiabilitiesAndStockholdersEquity ████▇▇▇▆▆▆▆▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁24952.024525.024766.024394.024009.023546.022682.022238.021854.021464.021223.020880.020471.019728.019482.019361.018966.018610.018482.017971.017706.017417.017241.017105.17316732.33216263.53116130.95615715.64715426.44715274.82115069.53315228.44614977.37714769.21614718.97614599.53514412.76114087.73914776.39114538.73314347.21614128.80714079.773NANANA
us-gaap:StockholdersEquity ██▇▇▇▆▆▆▅▅▅▅▄▃▃▃▃▂▂▂▂▂▂▂▂▁▁6690.06583.06454.06512.06338.06243.06121.06190.06027.05932.05864.05860.05736.05451.05385.05518.05384.05287.05218.05238.05153.05082.05049.05165.4525054.04993.04915.591NANANA4727.8044632.9324572.1264507.9424443.2684447.624321.4284250.8894235.8374258.6434157.924150.6544132.272NANA4003.491
  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:AssetsCurrent ▆▆███▇▅▂▂▂▂▂▃▂▂▃▃▂▂▂▂▂▂▃▃▂▂▂▂▂▁▂▁▁▁▂▂▁▅▆▆▅▁1570.01466.01906.01967.01896.01801.01285.0799.0741.0691.0781.0800.0833.0729.0720.0860.0808.0767.0784.0801.0691.0638.0657.0879.009890.085729.019661.369756.961707.635687.994550.39613.22545.84491.85499.447642.525606.374589.1091397.6591479.4611493.2141305.539534.307NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▂████▂▂▂▂▃▂▂▂▂▂▂▂▂▁▂▂▁▂▃▁▁▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁70.069.0547.0560.0569.0556.060.094.064.063.0130.086.068.055.055.093.064.078.075.046.052.066.045.075.224144.75224.29423.0874.12832.13330.75526.96432.45420.36621.18124.43318.53112.9199.50214.20715.62113.46613.52813.11223.50120.6112.633
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▁▁████▁▁▁▁▂▁▁▁▁▂▁▁▁104.099.0576.0599.0605.0589.091.0116.087.086.0159.0116.097.082.083.0122.093.0105.099.0NANANA72.0NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▆▄▆█▅▅▅▇▇▅▅▇▆▄▄▆▄▃▃▅▂▁▃311.0274.0321.0358.0298.0292.0294.0335.0337.0307.0301.0347.0324.0273.0272.0312.0288.0250.0269.0302.0240.0220.0255.0NANANA232.0NANANANANANANANANANANANANANANANANANANA
us-gaap:InventoryRawMaterialsAndSupplies ██▇▇█▇▆▆▇▆▅▅▅▅▅▅▅▅▄▄▅▅▄▄▄▄▄▄▃▃▂▃▃▂▁▂▂▂▁▂▂▂▁52.052.047.049.051.050.044.046.048.044.041.042.042.042.041.042.041.041.039.040.042.041.038.037.96538.33238.62237.1937.20336.84535.24232.97335.05333.81931.1529.77231.92531.71230.35528.59830.49131.41430.60628.867NANANA
us-gaap:OtherAssetsCurrent █▇▅▆▆▅▅▅▄▄▄▄▇▆▅▇▇▆▅▄▂▂▁▁▂▃▂▁▁▁▁▂▁▂▁▃▂▃▂▃▃▃▂183.0168.0127.0142.0137.0119.0118.0115.091.085.095.093.0160.0145.0113.0151.0151.0148.0118.0105.048.042.031.031.78141.50563.39345.41428.74427.19331.60428.40838.76531.08541.16630.48380.88857.57962.79654.13471.15174.9461.90648.185NANANA
  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:PropertyPlantAndEquipmentGross ██▇▇▇▆▆▆▅▅▅▅▄▄▄▃▃▂▂▂▁▁▁26369.025934.025614.025133.024745.024351.023941.023807.023355.023476.023204.022734.022361.021995.021716.020946.020575.020189.019954.019376.019058.018745.018504.0NANANA17269.0NANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ██████▇▇▇██▇▇▇▇▇▇▇▇▆▆▆▆▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁6155.06029.05904.05866.05801.05763.05709.05656.05557.05853.05795.05671.05584.05518.05470.05265.05184.05061.04962.04817.04741.04647.04571.0262.48247.013239.246248.341239.78243.33233.997228.465223.953215.183207.858199.467189.634180.568173.215164.417161.955161.703153.032143.051NANANA
us-gaap:PropertyPlantAndEquipmentNet ███▇▇▇▇▇▆▆▆▆▆▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁20214.019905.019710.019267.018944.018588.018232.018151.017798.017623.017409.017063.016777.016477.016246.015681.015391.015128.014992.014559.014317.014098.013933.013605.5113357.98113098.56713029.29612799.35812582.51112469.98112391.16212112.56711927.8711792.93511739.36411534.32711387.31111139.49911021.09810787.84410599.94210555.69811201.617NANANA
us-gaap:Goodwill ▆▆▆▆▆▆▆▇▇▇▇▇█▄▄▄▄▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁1511.01511.01504.01504.01506.01499.01501.01576.01575.01575.01575.01571.01621.01379.01379.01373.01373.01345.01345.01313.01313.01313.01302.01312.8881209.8411208.0431208.0431208.0651208.0651208.0651207.7641207.7411207.3361207.1611207.251207.5721207.5721195.0691195.0691195.511195.511204.2271250.6921195.5851195.585NA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:CustomerRelationshipsNANA49.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:OtherIntangibleAssetsNANA6.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▇▇▇▇▇▇▇███▁94.098.095.097.099.0101.0103.0109.0112.0116.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent █████████▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▂▁▂▂▁▁▁▁▁▁▁▁200.0199.0196.0202.0201.0203.0207.0201.0202.057.063.076.070.081.076.073.070.072.072.075.079.079.078.068.43970.47167.25769.86159.19260.23760.08160.99861.71759.92862.05763.0159.71459.17856.16357.40158.67851.40651.31250.432NANANA
  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:AccountsPayableCurrent ▂▂▄▃▃▃▅▃▂▂▄▂▂▂▄▂▂▁▃▂▃▁▂██▅█▇▄▄▇▅▄▃█▅▄▃▆▄▃▂▅146.0134.0189.0162.0169.0152.0203.0149.0140.0130.0175.0141.0139.0133.0195.0144.0134.0108.0154.0135.0148.0116.0126.0281.291283.57203.409285.8260.713192.441183.839264.589209.768178.418166.723279.613202.283183.908162.414243.709190.556159.024132.725199.24NANANA
us-gaap:AccruedLiabilitiesCurrent ▅▄▇▅▅▄▇▄▃▂▆▃▅▄█▄▄▃▇▅▁▁▄506.0466.0591.0505.0512.0476.0596.0490.0429.0406.0556.0455.0530.0495.0630.0498.0490.0453.0609.0530.0377.0368.0493.0NANANA395.0NANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ▄▆█▆▅▇▅▃▃▅▅▄█▇▆▄▇▆▆▅▄▄▄▂▃▃▃▂▃▂▃▂▂▂▂▂▂▁▃▃▃▂▁1710.02451.02881.02260.02113.02767.02045.01488.01317.02156.02094.01748.02951.02539.02325.01747.02661.02418.02392.01928.01740.01614.01533.01165.3871512.1881227.5481240.9981058.9351234.9111197.6991235.5331141.4731049.306958.332994.8321005.8741017.964743.6891489.1051380.0141327.6461134.88774.506NANANA
us-gaap:OtherLiabilitiesCurrent ▃▃▄▃▃▃▃▃▃▄▄▃▃▃▃▃▂▂▂▂▂▁▃▇▅▆█▆▅▄▅▆▄▄▅▇▅▄▅▅▄▃▄170.0171.0215.0179.0162.0164.0174.0172.0177.0204.0196.0169.0152.0159.0167.0151.0125.0135.0112.0118.0111.083.0144.0338.755248.541267.811363.079282.988231.878212.948241.976281.05198.6189.646239.95321.024255.267208.982223.597232.208222.924166.75193.223NANANA
us-gaap:TaxesPayableCurrent ▆█▄▆▅▆▄█▆▆▄▇▄▆▂▆▄▇▂▄▃▅▁▄▃▅▁▄▃▅▂▄▃▄▂▄▃▆▃▄▄▆▄65.076.050.064.058.064.046.078.061.064.045.067.048.064.033.061.047.067.031.045.039.058.026.046.33641.14155.71424.50546.94537.57954.12932.446.26837.43151.15235.55543.6739.12259.13736.60647.96247.47565.29146.71NANANA
  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 NANA9656.0NANANA8664.0NANANA7638.0NANANA6809.0NANANA6320.05893.05902.05902.05914.05960.128NANA5491.3415612.1875248.5385239.545244.2325305.3735312.195318.5195325.2895.2388315.3426975399.925389.942NANANANANANANA
 us-gaap:LongTermDebt dei:LegalEntity,us-gaap:DebtInstrument,us-gaap:LongtermDebtType awk:AmericanWaterCapitalCorpAWCC,awk:SeniorNoteSeriesH655Due2023,us-gaap:SeniorNotesNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:FairValueByMeasurementBasis us-gaap:CarryingReportedAmountFairValueDisclosure█▇▇▇▇▅▅▅▅▃▃▄▂▂▂▃▁▁▁10390.09634.09656.09644.09656.08667.08664.08666.08666.07628.07638.07831.06706.06814.06809.07357.06333.06316.06320.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DebtAndCapitalLeaseObligations NANA9333.0NANANA8644.0NANANA7576.0NANANA6498.0NANANA5759.0NANANA5928.0NANANA5509.377NANANA5244.232NANANANANANANA5389.9425392.4645393.166NA5452.362NANANA
us-gaap:LongTermDebtAndCapitalLeaseObligations █▇▇▇▇▆▆▆▆▄▄▄▂▂▃▃▁▁▁▂▂▂▂▂▁▁▁10343.09325.09329.09580.09589.08621.08639.08640.08642.07562.07569.07570.06345.06396.06490.06672.05650.05744.05749.05842.05850.05850.05862.05940.6155433.2395428.9015432.744NANANA5212.881NANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent █▅▅▄▄▄▄▄▄▄▄▄▅▄▃▄▄▄▄▅▅▄▄▂▂▁▁▁▁▁▁▁▁▆▇▁▁▁▁▁▁▂▂122.083.083.079.075.075.078.076.076.075.078.078.084.074.066.074.070.068.067.090.089.070.068.054.39148.02736.05937.15236.89337.71237.68838.92936.47540.88198.777114.87639.7138.62740.01538.96336.96539.70942.30145.824NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▆▇▇▇▇▇▇███▁79.084.081.083.084.087.089.094.097.0101.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:FinancialInstrument awk:OperatingandMaintenanceAgreement▄▄52.052.0NA56.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:PropertyPlantAndEquipmentByType us-gaap:LandBuildingsAndImprovementsNANA52.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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 ██▇▇▇▆▆▆▅▅▅▅▄▃▃▃▃▂▂▂▂▂▂▂▂▁▁6690.06583.06454.06512.06338.06243.06121.06190.06027.05932.05864.05860.05736.05451.05385.05518.05384.05287.05218.05238.05153.05082.05049.05165.4525054.04993.04915.591NANANA4727.8044632.9324572.1264507.9424443.2684447.624321.4284250.8894235.8374258.6434157.924150.6544132.272NANA4003.491
us-gaap:CommonStockValue ███████████████████████▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁2.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.01.8071.8011.7991.7951.7931.7911.791.7841.7811.7791.7771.771.7671.7631.7621.7571.7551.7541.7531.75NANANA
us-gaap:AdditionalPaidInCapitalCommonStock █████▇▇▇▇▇▇▇▇▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁6765.06757.06747.06739.06730.06713.06700.06695.06683.06668.06657.06647.06637.06438.06432.06423.06416.06400.06388.06388.06382.06368.06351.06348.6096324.0396313.2426301.7296297.1876290.4026272.2776261.3966251.2866243.8516232.8156222.6446213.0386198.5946192.4266180.5586173.7816170.0476164.8836156.675NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▇▇▇▆▇▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁332.0235.0102.0157.0-7.0-83.0-207.0-123.0-273.0-353.0-464.0-432.0-537.0-617.0-723.0-573.0-702.0-759.0-873.0-839.0-921.0-991.0-1073.0-1049.665-1162.346-1224.008-1295.549-1333.164-1374.174-1427.809-1495.698-1505.191-1555.993-1607.321-1664.955-1675.678-1785.039-1847.75-1848.801-1848.338-1945.185-1950.571-1959.235NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▇▇▇██▇█▇▇▇█▆▅▅▄▃▄▄▄▂▃▃▃▄▄▄▄████▂▁▁▁▃▃▃▃▅▅▅▅-46.0-48.0-49.0-38.0-39.0-41.0-36.0-46.0-47.0-47.0-34.0-60.0-69.0-75.0-79.0-87.0-85.0-82.0-86.0-99.0-96.0-87.0-88.0-79.175-80.053-81.503-81.868-35.942-34.671-35.151-34.635-109.901-112.468-114.286-116.191-91.507-93.89-95.549-97.677-68.555-68.696-69.958-71.446NANANA
us-gaap:TreasuryStockValue ██████████▇▇▇▇▆▆▆▆▅▅▅▅▄▂▂▁▁▁▁▁▁▁▁▁▁363.0363.0348.0348.0348.0348.0338.0338.0338.0338.0297.0297.0297.0297.0247.0247.0247.0274.0213.0214.0214.0210.0143.056.12430.05116.59210.51610.22210.22210.025.0435.0435.0435.0430.0NANANA0.00.00.00.00.019NANANA
  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 ▅▁▇█▅▁▇█▄▁▆█▄▂██▃▄▅341.0179.0438.0457.0351.0180.0438.0465.0312.0168.0394.0467.0306.0219.0463.0462.0247.0277.0331.0NANANA323.382437.623219.376198.619257.025389.647205.741244.874207.486398.479140.572149.625220.584418.143168.772148.099232.313313.648100.87161.526187.906289.518121.519175.99
us-gaap:NetCashProvidedByUsedInInvestingActivities ▅▇▃▅▅▆▂▆▅▇▅▆▁▇▃▇▇█▄-471.0-363.0-615.0-488.0-508.0-450.0-691.0-437.0-466.0-351.0-491.0-396.0-763.0-386.0-651.0-386.0-350.0-285.0-573.0NANANA-421.018-476.807-320.659-246.516-292.648-283.167-232.974-205.2-333.927-259.98-231.677-227.71-197.0-215.025-199.936229.605-306.396-230.576-209.237-166.188-240.791-174.726-193.444-137.782
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▁▄▃▄█▄▃▄▄▄▃▆▄▄▃▄▃▅135.0-293.0154.025.0173.0768.0228.01.0155.0110.0140.0-52.0472.0166.0154.0-52.091.014.0271.0NANANA67.492-30.344221.74149.111-15.425-64.48528.611-35.883120.951-126.41190.2974.833-17.682-197.50634.581-382.40972.669-80.917108.3055.07842.496-111.90179.902-47.831
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▄▁▄▄▅█▄▅▄▄▅▅▅▄▄▅▄▄5.0-477.0-23.0-6.016.0498.0-25.029.01.0-73.043.019.015.0-1.0-39.029.0-12.06.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  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:DepreciationDepletionAndAmortization ████▇▇▇▇▇▇▆▆▆▅▄▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▃▁▁▁158.0157.0153.0154.0152.0145.0152.0144.0142.0144.0141.0141.0134.0129.0114.0128.0126.0124.0120.0119.0115.0116.0112.504111.196108.923107.377105.686106.789105.862106.078103.969102.734101.36699.649100.85196.21992.32992.10488.79488.42487.65488.019107.89184.00581.69582.056
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▁█6.057.0NA-21.019.09.0NA8.024.013.0NA-49.022.0-5.0NA5.030.0-27.0NA27.03.049.0NA-14.0-6.012.0NANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▁▇█▅▁▇█▄▁▆█▄▂██▃▄▅341.0179.0438.0457.0351.0180.0438.0465.0312.0168.0394.0467.0306.0219.0463.0462.0247.0277.0331.0NANANA323.382437.623219.376198.619257.025389.647205.741244.874207.486398.479140.572149.625220.584418.143168.772148.099232.313313.648100.87161.526187.906289.518121.519175.99
us-gaap:NetIncomeLoss ▆▅▅█▆▄▄▇▆▄▄▆▅▄▁▆▄▃▄▅▅▃▄▆▄▃▃▅▄▃▃▅▄▃▂▅▄▂▃▅▃▂▂▄▃▂207.0133.0145.0264.0176.0124.098.0240.0170.0113.0112.0187.0162.0106.0-1.0203.0131.093.0101.0148.0137.082.099.0174.0123.07580.04393.501152.185109.29968.12359.693150.665101.26357.64355.478153.812107.02641.75464.848137.42284.56647.33240.154124.11472.75130.808
us-gaap:ProfitLoss NA133.0145.0264.0176.0124.098.0240.0170.0113.0112.0185.0162.0106.0-1.0203.0131.093.0101.0148.0137.082.098.988173.894123.080.093.393152.185NANANANANANANANANANANANANANANANANANA
  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 ▅▇▃▅▅▆▂▆▅▇▅▆▁▇▃▇▇█▄-471.0-363.0-615.0-488.0-508.0-450.0-691.0-437.0-466.0-351.0-491.0-396.0-763.0-386.0-651.0-386.0-350.0-285.0-573.0NANANA-421.018-476.807-320.659-246.516-292.648-283.167-232.974-205.2-333.927-259.98-231.677-227.71-197.0-215.025-199.936229.605-306.396-230.576-209.237-166.188-240.791-174.726-193.444-137.782
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▅▃▇▆▆▅█▄▄▂▆▄▄▃▆▃▃▁▄▃▂▁▄▂410.0342.0508.0444.0462.0408.0539.0403.0386.0326.0450.0397.0375.0364.0470.0362.0332.0270.0383.0331.0313.0284.0369.0312.0NANANANA209.315192.466314.99235.432216.744213.086248.217204.057242.934233.366302.918230.148215.381176.411243.546194.811184.597142.682
  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 ▄▁▄▃▄█▄▃▄▄▄▃▆▄▄▃▄▃▅135.0-293.0154.025.0173.0768.0228.01.0155.0110.0140.0-52.0472.0166.0154.0-52.091.014.0271.0NANANA67.492-30.344221.74149.111-15.425-64.48528.611-35.883120.951-126.41190.2974.833-17.682-197.50634.581-382.40972.669-80.917108.3055.07842.496-111.90179.902-47.831
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▇▁▁▁▇▁▃▁▇▁▁█▁▁▁█▁▁▄▁1100.02.084.087.01155.08.0339.07.01182.02.03.01340.05.010.013.01362.020.00.0551.00.0NANA1.273555.727NANA0.0500.4970.00.0401.421.3590.01.378300.70.00.35814.3720.160.07511.9770.298106.018161.3480.0921.101
us-gaap:RepaymentsOfLongTermDebt ▅▁▂▂▃▁▅▁▃▁▃▄▂▁█▅▁▁▃▁▁▁▂▂▁▁▂▃▁▁▇▁▁▁▄▂▃▁▁▁▁▂▂▃▁▁339.025.076.0100.0160.06.0342.07.0134.012.0196.0211.0113.06.0562.0328.02.04.0124.07.02.011.041.59982.7072.6033.091101.632133.3741.1732.192479.9467.443.3172.392210.645103.121151.9596.2291.3564.4811.57162.63776.251153.7724.67638.001
us-gaap:PaymentsOfDividendsCommonStock █▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▁▇▄▄▄▄▄▃▃▃▃109.0100.099.0100.0100.090.090.090.091.082.082.082.081.074.074.074.074.067.067.067.066.061.061.33661.01561.03455.61555.50655.45855.42249.96849.89649.8149.7440.088.43644.0840.52940.41440.39240.35838.5838.52538.47638.457NANA
us-gaap:Dividends 110.0NANA100.0100.0NANA90.090.0NANANANANANANANANANANANANANA61.19261.39455.64755.81455.66455.64750.12850.10950.00749.9130.00988.90744.32340.74440.56340.70640.54138.8138.65138.56938.5836.797NA
  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
Value2000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.01807000.01801000.01799000.01795000.01793000.01791000.01790000.01784000.01781000.01779000.01777000.01770000.01767000.01763000.01762000.01757000.01755000.01754000.01753000.01750000.01746000.0
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 Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Shares Outstanding

us-gaap:SharesOutstanding us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

us-gaap:CommonStock


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value186186186186186186185185185185185185185182182182182182181181181181180180180179179179179178178178177177176176176176175175175175174174174174160
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value-5.3-5.3-5.2-5.2-5.2-5.2-5.1-5.1-5.1-5.1-4.7-4.7-4.7-4.7-4.1-4.1-4.1-4.5-3.7-3.7-3.7-3.7-2.6-1.1-0.6-0.37-0.261-0.254-0.254-0.25-0.132-0.132-0.132-0.1320.00.00.00.00.00.00.00.0-0.0010.00.00.00.0
Percentage of SharesOutstanding-2.8-2.8-2.8-2.8-2.8-2.8-2.7-2.7-2.7-2.7-2.5-2.5-2.5-2.6-2.2-2.2-2.2-2.5-2.0-2.0-2.0-2.0-1.4-0.6-0.3-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.10.00.00.00.00.00.00.00.0-0.00.00.00.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value182182182181181181181181181179179179179179178178179180180180179179179179178178177177177176176176175174174
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value182181181181181181181181181179178178178178178178178179179179178178178177177177176176175175175175174174174
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value1.140.730.81.460.970.690.541.330.940.620.621.040.90.6-0.011.140.740.520.570.830.770.460.550.970.690.450.520.850.610.380.330.850.570.320.310.870.610.240.370.780.480.270.230.710.420.18
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
Value1.140.730.81.460.970.680.541.330.940.620.621.040.910.5901.130.730.520.570.830.770.460.550.960.680.440.520.850.610.380.330.840.570.320.310.860.610.240.370.780.480.270.230.710.420.18
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value2091341342651781191082411701001381961681107.0201128971141451288390175124804715010967134153103593015610843111378548291257332
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 RegulatedAndUnregulatedOperatingRevenue20.915.114.524.619.114.112.023.819.312.316.220.119.714.50.921.515.212.814.215.615.511.211.519.515.911.56.517.814.510.018.918.514.29.44.518.814.67.11.717.912.78.04.816.811.65.7

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value251155181352232159136318227152170255222140201340226145166243225136157287203133149263182
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue25.117.519.632.624.918.815.131.425.718.720.026.126.018.424.536.326.819.220.726.127.218.320.232.026.019.120.431.224.2

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value-32.0-30.0-36.0-25.0-34.0-33.0-42.0-25.0-10.0-25.0-21.0-19.0-22.0-18.0-13.0-28.0-19.0-19.0-20.0-15.0-18.0-17.0-19.224-17.213-13.0-13.0-16.09-12.36
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-12.7-19.4-19.9-7.1-14.7-20.8-30.9-7.9-4.4-16.4-12.4-7.5-9.9-12.9-6.5-8.2-8.4-13.1-12.0-6.2-8.0-12.5-12.2-6.0-6.4-9.8-10.8-4.7
Percentage of RegulatedAndUnregulatedOperatingRevenue-3.2-3.4-3.9-2.3-3.7-3.9-4.7-2.5-1.1-3.1-2.5-1.9-2.6-2.4-1.6-3.0-2.3-2.5-2.5-1.6-2.2-2.3-2.5-1.9-1.7-1.9-2.2-1.5
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:CorporateNonSegment800.0750.00.0500.0850.0825.00.0416.7200.0416.70.0316.7440.0360.00.0466.7380.0316.70.0300.0450.0340.00.0351.6260.0325.00.0273.9

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value262229313030-20.030292721-14.0181620211510.021122210.0172018121417
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest10.414.216.08.812.918.9-14.79.412.817.812.4-5.58.111.410.06.26.66.912.74.99.87.411.17.28.89.09.66.7
Percentage of RegulatedAndUnregulatedOperatingRevenue2.62.53.12.93.23.6-2.23.03.33.32.5-1.42.12.12.42.21.81.32.61.32.71.32.22.32.31.72.02.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:MarketBasedBusinesses17.816.10.022.322.723.40.022.122.020.10.0-11.215.816.00.021.014.69.70.011.019.18.80.017.218.013.80.018.2

us-gaap:OperatingSegments, awk:RegulatedBusiness


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value257163188346236162198313208150170288226142194347230154165246221143159283199134151258
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest102.4105.2103.998.3101.7101.9145.698.491.698.7100.0112.9101.8101.496.5102.1101.8106.299.4101.298.2105.1101.198.897.7100.8101.198.0
Percentage of RegulatedAndUnregulatedOperatingRevenue25.718.420.432.125.319.222.030.923.618.520.029.526.518.723.637.127.320.420.626.526.719.220.431.625.419.220.730.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:RegulatedBusiness30.021.60.036.629.422.50.035.427.521.90.033.630.421.30.041.230.823.40.029.830.922.60.036.329.021.80.034.3

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
Value4422368856353878573958706034202137955265958854581138053551077244409866314010080354178512840754618
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 RegulatedAndUnregulatedOperatingRevenue4.42.53.98.26.04.14.27.76.54.86.87.27.04.524.614.611.36.98.110.210.67.37.512.610.37.77.612.79.66.65.711.99.24.95.912.110.85.76.410.27.64.76.510.17.33.3

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-4.0-12.0-4.0-4.0-10.0-13.0-6.0-6.0-3.0-8.00.0-1.0-4.0-8.0110-5.0-2.0-11.0-10.0-4.0-7.0-6.0-12.0-4.0-2.0-5.0
Percentage of IncomeTaxExpenseBenefit-9.1-54.5-11.1-4.5-17.9-37.1-15.8-7.7-5.3-20.50.0-1.4-6.7-23.554.5-3.6-2.1-21.2-15.4-4.2-8.0-11.1-20.4-3.5-2.5-9.4
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.4-1.4-0.4-0.4-1.1-1.5-0.7-0.6-0.3-1.00.0-0.1-0.5-1.113.4-0.5-0.2-1.5-1.2-0.4-0.8-0.8-1.5-0.4-0.3-0.7
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:CorporateNonSegment100.0300.00.080.0250.0325.00.0100.060.0133.30.016.780.0160.00.083.340.0183.30.080.0175.0120.00.081.740.0125.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6.06.06.07.08.08.0-2.07.08.07.07.0-5.05.04.0117.07.03.08.05.09.04.07.08.06.05.0
Percentage of IncomeTaxExpenseBenefit13.627.316.78.014.322.9-5.39.014.017.912.1-7.18.311.85.45.17.45.812.35.310.27.411.97.17.49.4
Percentage of RegulatedAndUnregulatedOperatingRevenue0.60.70.70.60.90.9-0.20.70.90.90.8-0.50.60.51.30.70.80.41.00.51.10.50.90.90.80.7
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:MarketBasedBusinesses4.14.40.05.06.16.20.05.16.15.20.0-4.04.44.00.07.06.82.90.04.67.83.50.06.66.05.7

us-gaap:OperatingSegments, awk:RegulatedBusiness


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value422834855840467752405176593881135906067948656641097753
Percentage of IncomeTaxExpenseBenefit95.5127.394.496.6103.6114.3121.198.791.2102.687.9108.698.3111.840.198.594.7115.4103.198.997.7103.7108.896.395.699.1
Percentage of RegulatedAndUnregulatedOperatingRevenue4.23.23.77.96.24.75.17.65.94.96.07.86.95.09.914.410.77.98.410.110.47.58.212.29.87.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:RegulatedBusiness4.93.70.09.07.25.60.08.76.95.80.08.97.95.70.016.012.19.10.011.412.08.80.014.011.28.6

Interest Income Expense Nonoperating Net

us-gaap:InterestIncomeExpenseNonoperatingNet

us-gaap:InterestIncomeExpenseNonoperatingNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-101000000.0-98000000.0-99000000.0-99000000.0-101000000.0-96000000.0-98000000.0-97000000.0-94000000.0-93000000.0-91000000.0-89000000.0-86000000.0-84000000.0-83000000.0-89000000.0-85000000.0-85000000.0-83000000.0-81000000.0-81000000.0-80000000.0-80000000.0-77000000.0-76000000.0-75000000.0
Percentage of InterestIncomeExpenseNonoperatingNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-10.1-11.0-10.7-9.2-10.8-11.4-10.9-9.6-10.7-11.4-10.7-9.1-10.1-11.0-10.1-9.5-10.1-11.2-10.3-8.7-9.8-10.8-10.2-8.6-9.7-10.7

us-gaap:InterestIncomeExpenseNonoperatingNet us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-28000000.0-26000000.0-26000000.0-27000000.0-27000000.0-25000000.0-26000000.0-24000000.0-21000000.0-21000000.0-21000000.0-18000000.0-19000000.0-16000000.0-16000000.0-23000000.0-19000000.0-19000000.0-19000000.0-17000000.0-19000000.0-16000000.0-18000000.0-14000000.0-16000000.0-14000000.0
Percentage of InterestIncomeExpenseNonoperatingNet27.726.526.327.326.726.026.524.722.322.623.120.222.119.019.325.822.422.422.921.023.520.022.518.221.118.7
Percentage of RegulatedAndUnregulatedOperatingRevenue-2.8-2.9-2.8-2.5-2.9-3.0-2.9-2.4-2.4-2.6-2.5-1.8-2.2-2.1-1.9-2.5-2.3-2.5-2.4-1.8-2.3-2.2-2.3-1.6-2.0-2.0
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:CorporateNonSegment700.0650.00.0540.0675.0625.00.0400.0420.0350.00.0300.0380.0320.00.0383.3380.0316.70.0340.0475.0320.00.0285.9320.0350.0

us-gaap:InterestIncomeExpenseNonoperatingNet us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-30
Value-1000000.0-1000000.00001000000.02000000.01000000.01000000.01000000.01000000.002000000.01000000.01000000.01000000.01000000.001000000.001000000.01000000.001000000.0
Percentage of InterestIncomeExpenseNonoperatingNet1.01.0-0.0-0.0-0.0-1.0-2.0-1.0-1.1-1.1-1.1-0.0-2.3-1.2-1.2-1.1-1.2-0.0-1.2-0.0-1.2-1.2-0.0-1.3
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.1-0.10.00.00.00.10.20.10.10.10.10.00.20.10.10.10.10.00.10.00.10.10.00.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:MarketBasedBusinesses-0.7-0.70.00.00.00.80.00.70.80.70.00.01.81.00.01.01.00.00.00.00.90.00.01.0

us-gaap:OperatingSegments, awk:RegulatedBusiness


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-72000000.0-71000000.0-73000000.0-72000000.0-74000000.0-72000000.0-74000000.0-74000000.0-74000000.0-73000000.0-71000000.0-71000000.0-69000000.0-69000000.0-68000000.0-67000000.0-67000000.0-66000000.0-65000000.0-64000000.0-63000000.0-64000000.0-63000000.0-63000000.0-61000000.0-61000000.0
Percentage of InterestIncomeExpenseNonoperatingNet71.372.473.772.773.375.075.576.378.778.578.079.880.282.181.975.378.877.678.379.077.880.078.881.880.381.3
Percentage of RegulatedAndUnregulatedOperatingRevenue-7.2-8.0-7.9-6.7-7.9-8.5-8.2-7.3-8.4-9.0-8.4-7.3-8.1-9.1-8.3-7.2-7.9-8.7-8.1-6.9-7.6-8.6-8.0-7.0-7.8-8.7
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:RegulatedBusiness-8.4-9.40.0-7.6-9.2-10.00.0-8.4-9.8-10.70.0-8.3-9.3-10.40.0-8.0-9.0-10.00.0-7.7-8.8-10.10.0-8.1-8.9-9.9

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
Value20713314526417612498240170113112187162106-1.020313193101148137829917412380931521096859150101575515310741641378447401247230
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 RegulatedAndUnregulatedOperatingRevenue20.715.015.724.518.914.710.923.719.313.913.219.219.013.9-0.121.715.512.312.615.916.611.012.619.415.711.512.818.014.510.08.418.214.09.18.118.514.46.810.117.912.57.76.416.611.55.4

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-27.0-19.0-32.0-20.0-24.0-21.0-36.0-19.0-7.0-17.0-20.0-19.0-18.0-10.0-123.0-23.0-18.0-8.0-10.0-11.0-11.0-11.0-8.0-12.0-11.0-8.0
Percentage of NetIncomeLoss-13.0-14.3-22.1-7.6-13.6-16.9-36.7-7.9-4.1-15.0-17.9-10.2-11.1-9.412300.0-11.3-13.7-8.6-9.9-7.4-8.0-13.4-8.1-6.9-8.9-10.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-2.7-2.1-3.5-1.9-2.6-2.5-4.0-1.9-0.8-2.1-2.4-1.9-2.1-1.3-15.0-2.5-2.1-1.1-1.2-1.2-1.3-1.5-1.0-1.3-1.4-1.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:CorporateNonSegment675.0475.00.0400.0600.0525.00.0316.7140.0283.30.0316.7360.0200.00.0383.3360.0133.30.0220.0275.0220.00.0245.1220.0200.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value191723232322-18.023212014-7.013129.0149.07.0137.0136.01112127.0
Percentage of NetIncomeLoss9.212.815.98.713.117.7-18.49.612.417.712.5-3.78.011.3-900.06.96.97.512.94.79.57.311.16.99.88.7
Percentage of RegulatedAndUnregulatedOperatingRevenue1.91.92.52.12.52.6-2.02.32.42.51.6-0.71.51.61.11.51.10.91.60.81.60.81.41.31.51.0
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:MarketBasedBusinesses13.012.40.016.517.417.20.016.915.914.90.0-5.611.412.00.014.08.76.80.06.411.35.30.010.012.08.0

us-gaap:OperatingSegments, awk:RegulatedBusiness


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2151351542611771231522361561101182131671041132121409498152135879617412281
Percentage of NetIncomeLoss103.9101.5106.298.9100.699.2155.198.391.897.3105.4113.9103.198.1-11300.0104.4106.9101.197.0102.798.5106.197.0100.099.1101.2
Percentage of RegulatedAndUnregulatedOperatingRevenue21.515.216.724.219.014.616.923.317.713.513.921.819.613.713.822.616.612.412.216.316.311.712.319.415.611.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:RegulatedBusiness25.117.90.027.622.017.10.026.720.716.10.024.922.415.60.025.218.814.30.018.418.913.70.022.317.813.2

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value207133264176124240170113112187162106-1.020313193101148137829917312380931521096859150101575515310741401378447401247230
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.062.1100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue20.715.024.518.914.723.719.313.913.219.219.013.9-0.121.715.512.312.615.916.611.012.619.415.711.512.818.014.510.08.418.214.09.18.118.514.46.86.317.912.57.76.416.611.55.4
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302020-06-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value207176173123809315210968591501015755153106414013784264012472
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue20.718.919.415.711.512.818.014.510.08.418.214.09.18.118.514.36.76.317.912.54.36.416.611.5

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302020-06-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value207176173123809315210968591501015755153107414013784264012472
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue20.718.919.415.711.512.818.014.510.08.418.214.09.18.118.514.46.76.317.912.54.36.416.611.5

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
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-79000000.0-74000000.0-82000000.0-81000000.0-81000000.0-80000000.0-88000000.0-88000000.0-75000000.0-86000000.0-78000000.0-80000000.0-80000000.0-77000000.0-78000000.0-90000000.0-82000000.0-82000000.0-82000000.0-76000000.0-74000000.0-78000000.0-74069000.0-74198000.0-73934000.0-70799000.0-73915000.0-73472000.0-72285000.0-73090000.0-115910000.0-74883000.0-74168000.0-75422000.0-72639000.0-72616000.0-73367000.0-75093000.0-74917000.0-74558000.0-75347000.0-74760000.0-77451000.0-71409000.0-73693000.0-76300000.0
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-7.9-8.3-8.9-7.5-8.7-9.5-9.8-8.7-8.5-10.6-9.2-8.2-9.4-10.1-9.5-9.6-9.7-10.8-10.2-8.2-8.9-10.5-9.5-8.3-9.5-10.1-10.1-8.7-9.6-10.8-16.3-9.0-10.2-11.9-10.7-8.7-9.8-12.1-11.7-9.7-11.2-12.2-12.4-9.5-11.6-13.5

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
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
Value669659660646618605678607580575602641551544542506536529554611528529550534504493508508505495496505482471513504474458446485473466599482446442
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue67.074.271.559.966.471.775.259.965.870.770.865.764.671.566.054.163.570.069.165.763.871.270.359.764.570.769.560.167.073.069.760.966.674.275.560.663.774.269.863.370.276.395.764.470.378.0

us-gaap:OperatingExpenses us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Operating
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
Value-2.02.04.0-5.04.03.011-6.0-6.0-3.0-8.0-3.00.0-4.0-9.0-7.0-6.0-6.0-4.0-8.0-4.0-5.0-0.26-4.614-6.46-6.666-2.51-5.943-3.077-4.919-5.117-6.164-4.46-5.993-3.054-6.868
Percentage of OperatingExpenses-0.30.30.6-0.80.60.51.6-1.0-1.0-0.5-1.3-0.50.0-0.7-1.7-1.4-1.1-1.1-0.7-1.3-0.8-0.9-0.0-0.9-1.3-1.4-0.5-1.2-0.6-1.0-1.0-1.2-0.9-1.3-0.6-1.4
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.20.20.4-0.50.40.41.2-0.6-0.7-0.4-0.9-0.30.0-0.5-1.1-0.7-0.7-0.8-0.5-0.9-0.5-0.7-0.0-0.5-0.8-1.0-0.3-0.7-0.4-0.7-0.7-0.7-0.6-0.9-0.4-0.8
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:CorporateNonSegment50.0-50.00.0100.0-100.0-75.00.0100.0120.050.00.050.0-0.080.00.0116.7120.0100.00.0160.0100.0100.00.094.2129.2166.70.0131.770.8109.40.0138.2101.7135.10.0142.9

us-gaap:OperatingExpenses us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Operating
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
Value1191141121081029915810810610811813998869780899491989810410910183768779
Percentage of OperatingExpenses17.817.317.016.716.516.423.317.818.318.819.621.717.815.817.915.816.617.816.416.018.619.719.919.016.415.417.315.7
Percentage of RegulatedAndUnregulatedOperatingRevenue11.912.812.110.011.011.717.510.712.013.313.914.211.511.311.88.510.512.411.310.511.914.014.011.310.610.912.09.4
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:MarketBasedBusinesses81.583.20.077.777.377.30.079.480.380.60.0111.286.086.00.080.086.491.30.089.985.291.20.084.483.087.40.082.4

us-gaap:OperatingSegments, awk:RegulatedBusiness


Operating
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
Value552543544543512503509505480470492505453462454433453441467521434430441437428424423434435431
Percentage of OperatingExpenses82.582.482.484.182.883.175.183.282.881.781.778.882.284.983.885.684.583.484.385.382.281.380.281.984.986.083.485.586.287.1
Percentage of RegulatedAndUnregulatedOperatingRevenue55.361.158.950.355.059.656.449.954.457.857.951.753.160.755.346.353.758.358.256.052.557.956.448.954.760.858.051.457.763.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:RegulatedBusiness64.471.90.057.563.869.90.057.263.668.60.058.960.969.40.051.460.766.90.063.160.667.80.056.162.369.00.057.70.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
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
Value330229263433313239224406302238248335302217279430308227248319299214232361277204223337253186215323241164166327270159177281201144149266188124
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue33.025.828.540.133.628.324.840.134.229.329.234.335.428.534.045.936.530.030.934.336.228.829.640.335.529.330.539.933.627.430.339.133.425.824.539.436.325.827.736.729.823.723.935.629.722.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value1.0-11.01.02.0-5.010.01.00.0-13.0269.06.04.08.0-2.0-3.04.013-3.0-9.01.0-8.6930.8781.450.365-45.926-1.2710.48-0.516752.5671.8181.905-24.6842.3831.6592.128-29.1220.141
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.1-1.20.10.2-0.61.10.10.0-1.63.10.90.70.51.0-0.2-0.40.51.6-0.3-1.10.1-1.10.10.20.1-6.3-0.20.1-0.110.60.30.30.3-3.60.30.20.3-4.60.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value1.01.02.0-5.01.0-13.0269.06.04.08.0-2.0-3.04.013-3.0-9.01.0-8.6930.8781.450.365-45.926-1.2710.48-0.516752.5671.8181.905-24.6842.3831.6592.128-29.1220.141
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.10.10.2-0.60.1-1.63.10.90.70.51.0-0.2-0.40.51.6-0.3-1.10.1-1.10.10.20.1-6.3-0.20.1-0.110.60.30.30.3-3.60.30.20.3-4.60.0
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


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
Value3.04.05.06.08.03.010.05.0153.05.06.04.04.06.05.03.03.01.05.07.02.014-0.189-1.0121.756-0.605-0.733-0.317-1.541-2.564-0.449-0.256-0.776-0.6840.0390.335-0.616-0.5780.0130.679-1.1412.0940.5051.9870.069
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.30.50.50.60.90.41.10.51.70.40.60.60.50.50.70.50.40.40.10.50.80.31.8-0.0-0.10.3-0.1-0.1-0.0-0.2-0.4-0.1-0.0-0.1-0.10.00.0-0.1-0.10.00.1-0.20.30.10.30.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value13314526417612498240170113112185162106-1.02031319310114813782981731238093152
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue15.015.724.518.914.710.923.719.313.913.219.019.013.9-0.121.715.512.312.615.916.611.012.619.415.711.512.818.0

Regulated And Unregulated Operating Revenue

us-gaap:RegulatedAndUnregulatedOperatingRevenue

us-gaap:RegulatedAndUnregulatedOperatingRevenue


Regulated
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
Value99988892310799318449021013882813850976853761821936844756802930827743783896782698731846754679712829724636680831745618639766674610625748634566
Percentage of RegulatedAndUnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatedAndUnregulatedOperatingRevenue us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Regulated
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
Value-4.0-4.0-5.0-5.0-4.0-4.0-6.0-6.0-5.0-6.0-4.0-6.0-5.0-5.0-6.0-6.0-5.0-6.0-6.0-5.0-4.0-5.0-3.633-4.896-5.0-4.0-4.647-4.512-4.345-4.496-4.718-4.459-4.387-4.436-4.378-4.805
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.4-0.5-0.5-0.5-0.4-0.5-0.7-0.6-0.6-0.7-0.5-0.6-0.6-0.7-0.7-0.6-0.6-0.8-0.7-0.5-0.5-0.7-0.5-0.5-0.6-0.6-0.6-0.5-0.6-0.7-0.7-0.5-0.6-0.7-0.6-0.6
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.4-0.5-0.5-0.5-0.4-0.5-0.7-0.6-0.6-0.7-0.5-0.6-0.6-0.7-0.7-0.6-0.6-0.8-0.7-0.5-0.5-0.7-0.5-0.5-0.6-0.6-0.6-0.5-0.6-0.7-0.7-0.5-0.6-0.7-0.6-0.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatedAndUnregulatedOperatingRevenue us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Regulated
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
Value1461371411391321281371361321341371251141001161001031031131091151141261201008710196
Percentage of RegulatedAndUnregulatedOperatingRevenue14.615.415.312.914.215.215.213.415.016.516.112.813.413.114.110.712.213.614.111.713.915.316.113.412.812.513.811.5
Percentage of RegulatedAndUnregulatedOperatingRevenue14.615.415.312.914.215.215.213.415.016.516.112.813.413.114.110.712.213.614.111.713.915.316.113.412.812.513.811.5
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:MarketBasedBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, awk:RegulatedBusiness


Regulated
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
Value857755787945803720771883755685717857744666711842746659695826716634660780687615634753
Percentage of RegulatedAndUnregulatedOperatingRevenue85.885.085.387.686.385.385.587.285.684.384.487.887.287.586.690.088.487.286.788.886.685.384.387.187.888.186.889.1
Percentage of RegulatedAndUnregulatedOperatingRevenue85.885.085.387.686.385.385.587.285.684.384.487.887.287.586.690.088.487.286.788.886.685.384.387.187.888.186.889.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatedAndUnregulatedOperatingRevenue us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

awk:Commercial, awk:WastewaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.09.09.08.09.08.08.09.07.07.08.08.07.07.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.91.01.00.71.00.90.90.90.80.90.90.80.80.9
Percentage of RegulatedAndUnregulatedOperatingRevenue0.91.01.00.71.00.90.90.90.80.90.90.80.80.9
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Commercial awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:Commercial, awk:WaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value170144156187142142162188153136148183152133
Percentage of RegulatedAndUnregulatedOperatingRevenue17.016.216.917.315.316.818.018.617.316.717.418.817.817.5
Percentage of RegulatedAndUnregulatedOperatingRevenue17.016.216.917.315.316.818.018.617.316.717.418.817.817.5
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Commercial awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:FireService, awk:WaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value37373737363736373534
Percentage of RegulatedAndUnregulatedOperatingRevenue3.74.24.03.43.94.44.03.74.04.2
Percentage of RegulatedAndUnregulatedOperatingRevenue3.74.24.03.43.94.44.03.74.04.2
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:FireService awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:Industrial, awk:WastewaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.01.01.01.00.01.01.01.00.01.0-8.03.00.01.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.10.10.10.10.00.10.10.10.00.1-0.90.30.00.1
Percentage of RegulatedAndUnregulatedOperatingRevenue0.10.10.10.10.00.10.10.10.00.1-0.90.30.00.1
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Industrial awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0

awk:Industrial, awk:WaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3432323831323438343231403431
Percentage of RegulatedAndUnregulatedOperatingRevenue3.43.63.53.53.33.83.83.83.93.93.64.14.04.1
Percentage of RegulatedAndUnregulatedOperatingRevenue3.43.63.53.53.33.83.83.83.93.93.64.14.04.1
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Industrial awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:PublicandOther, awk:WastewaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.04.03.04.04.03.04.02.05.03.0121.04.03.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.40.50.30.40.40.40.40.20.60.41.40.10.50.4
Percentage of RegulatedAndUnregulatedOperatingRevenue0.40.50.30.40.40.40.40.20.60.41.40.10.50.4
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:PublicandOther awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:PublicandOther, awk:WaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value56445358414954645145-56.0888580
Percentage of RegulatedAndUnregulatedOperatingRevenue5.65.05.75.44.45.86.06.35.85.5-6.69.010.010.5
Percentage of RegulatedAndUnregulatedOperatingRevenue5.65.05.75.44.45.86.06.35.85.5-6.69.010.010.5
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:PublicandOther awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:Residential, awk:WastewaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3836353533313131282932292727
Percentage of RegulatedAndUnregulatedOperatingRevenue3.84.13.83.23.53.73.43.13.23.63.83.03.23.5
Percentage of RegulatedAndUnregulatedOperatingRevenue3.84.13.83.23.53.73.43.13.23.63.83.03.23.5
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Residential awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:Residential, awk:WaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value491430460562474399438504415378403482410368
Percentage of RegulatedAndUnregulatedOperatingRevenue49.148.449.852.150.947.348.649.847.146.547.449.448.148.4
Percentage of RegulatedAndUnregulatedOperatingRevenue49.148.449.852.150.947.348.649.847.146.547.449.448.148.4
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Residential awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatedAndUnregulatedOperatingRevenue us-gaap:ProductOrService

us-gaap:ServiceOther


Regulated
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
Value-4.0-4.0-5.0-5.0-4.0-4.0-6.0-6.0-5.0-6.0-4.0-6.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.4-0.5-0.5-0.5-0.4-0.5-0.7-0.6-0.6-0.7-0.5-0.6
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.4-0.5-0.5-0.5-0.4-0.5-0.7-0.6-0.6-0.7-0.5-0.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:ServiceOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatedAndUnregulatedOperatingRevenue us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

awk:MiscellaneousUtilityCharge, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8.08.04.010.010.08.09.09.08.010.012131211
Percentage of RegulatedAndUnregulatedOperatingRevenue0.80.90.40.91.10.91.00.90.91.21.41.31.41.4
Percentage of RegulatedAndUnregulatedOperatingRevenue0.80.90.40.91.10.91.00.90.91.21.41.31.41.4
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:MiscellaneousUtilityCharge awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:WastewaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5250484846434443404044413838
Percentage of RegulatedAndUnregulatedOperatingRevenue5.25.65.24.44.95.14.94.24.54.95.24.24.55.0
Percentage of RegulatedAndUnregulatedOperatingRevenue5.25.65.24.44.95.14.94.24.54.95.24.24.55.0
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:WaterServices, awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value788687738882724659724831688625663793681612
Percentage of RegulatedAndUnregulatedOperatingRevenue78.977.480.081.777.878.180.382.078.076.978.081.279.880.4
Percentage of RegulatedAndUnregulatedOperatingRevenue78.977.480.081.777.878.180.382.078.076.978.081.279.880.4
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatedAndUnregulatedOperatingRevenue us-gaap:StatementBusinessSegments

awk:MarketBasedBusinesses


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value146137141139132128137136132134137125114100
Percentage of RegulatedAndUnregulatedOperatingRevenue14.615.415.312.914.215.215.213.415.016.516.112.813.413.1
Percentage of RegulatedAndUnregulatedOperatingRevenue14.615.415.312.914.215.215.213.415.016.516.112.813.413.1
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:MarketBasedBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:RegulatedBusiness


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value857755787945803720771883755685717857744666
Percentage of RegulatedAndUnregulatedOperatingRevenue85.885.085.387.686.385.385.587.285.684.384.487.887.287.5
Percentage of RegulatedAndUnregulatedOperatingRevenue85.885.085.387.686.385.385.587.285.684.384.487.887.287.5
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax


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
Value99087892310749088349021013863804850955840756821936844756802930827743783896782698731846754679712829724636680831745618639766674610625748634566
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue99.198.9100.099.597.598.8100.0100.097.898.9100.097.898.599.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

awk:Commercial, awk:WastewaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.09.09.08.09.08.08.09.07.07.08.08.07.07.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.01.00.71.01.00.90.90.80.90.90.80.80.9
Percentage of RegulatedAndUnregulatedOperatingRevenue0.91.01.00.71.00.90.90.90.80.90.90.80.80.9
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Commercial awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:Commercial, awk:WaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value170144156187142142162188153136151180152133
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax17.216.416.917.415.617.018.018.617.716.917.818.818.117.6
Percentage of RegulatedAndUnregulatedOperatingRevenue17.016.216.917.315.316.818.018.617.316.717.818.417.817.5
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Commercial awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0102.098.4100.0100.0

awk:FireService, awk:WaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value37373737363736373534
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.74.24.03.44.04.44.03.74.14.2
Percentage of RegulatedAndUnregulatedOperatingRevenue3.74.24.03.43.94.44.03.74.04.2
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:FireService awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:Industrial, awk:WastewaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.01.01.01.00.01.01.01.00.01.0-8.03.00.01.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.10.10.10.00.10.10.10.00.1-0.90.30.00.1
Percentage of RegulatedAndUnregulatedOperatingRevenue0.10.10.10.10.00.10.10.10.00.1-0.90.30.00.1
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Industrial awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0

awk:Industrial, awk:WaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3432323831323438343231403431
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.43.63.53.53.43.83.83.83.94.03.64.24.04.1
Percentage of RegulatedAndUnregulatedOperatingRevenue3.43.63.53.53.33.83.83.83.93.93.64.14.04.1
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Industrial awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:PublicandOther, awk:WastewaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.04.03.04.04.03.04.02.05.03.0121.04.03.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.50.30.40.40.40.40.20.60.41.40.10.50.4
Percentage of RegulatedAndUnregulatedOperatingRevenue0.40.50.30.40.40.40.40.20.60.41.40.10.50.4
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:PublicandOther awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:PublicandOther, awk:WaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value56445358414954645145-54.0868580
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.75.05.75.44.55.96.06.35.95.6-6.49.010.110.6
Percentage of RegulatedAndUnregulatedOperatingRevenue5.65.05.75.44.45.86.06.35.85.5-6.48.810.010.5
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:PublicandOther awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.096.497.7100.0100.0

awk:Residential, awk:WastewaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3836353533313131282932292727
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.84.13.83.33.63.73.43.13.23.63.83.03.23.6
Percentage of RegulatedAndUnregulatedOperatingRevenue3.84.13.83.23.53.73.43.13.23.63.83.03.23.5
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Residential awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:Residential, awk:WaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value491430460562474399439503415378410475410368
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax49.649.049.852.352.247.848.749.748.147.048.249.748.848.7
Percentage of RegulatedAndUnregulatedOperatingRevenue49.148.449.852.150.947.348.749.747.146.548.248.748.148.4
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:Residential awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.299.8100.0100.0101.798.5100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService

us-gaap:ServiceOther


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-4.0-4.0-6.0-5.0-4.0-4.0-7.0-5.0-5.0-5.0-6.0-5.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.4-0.5-0.7-0.5-0.4-0.5-0.8-0.5-0.6-0.6-0.7-0.5
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.4-0.5-0.7-0.5-0.4-0.5-0.8-0.5-0.6-0.6-0.7-0.5
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:ServiceOther100.0100.0120.0100.0100.0100.0116.783.3100.083.3150.083.3

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

awk:MiscellaneousUtilityCharge, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8.08.04.010.010.08.09.09.08.010.012131211
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.80.90.40.91.11.01.00.90.91.21.41.41.41.5
Percentage of RegulatedAndUnregulatedOperatingRevenue0.80.90.40.91.10.91.00.90.91.21.41.31.41.4
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:MiscellaneousUtilityCharge awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:WastewaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5250484846434443404044413838
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.35.75.24.55.15.24.94.24.65.05.24.34.55.0
Percentage of RegulatedAndUnregulatedOperatingRevenue5.25.65.24.44.95.14.94.24.54.95.24.24.55.0
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:WastewaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:WaterServices, awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value788687738882724659725830688625675781681612
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax79.678.280.082.179.779.080.481.979.777.779.481.881.181.0
Percentage of RegulatedAndUnregulatedOperatingRevenue78.977.480.081.777.878.180.481.978.076.979.480.079.880.4
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:WaterServices awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.199.9100.0100.0101.898.5100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments

awk:MarketBasedBusinesses


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value146137141139132128137136132134137125114100
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax14.715.615.312.914.515.315.213.415.316.716.113.113.613.2
Percentage of RegulatedAndUnregulatedOperatingRevenue14.615.415.312.914.215.215.213.415.016.516.112.813.413.1
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:MarketBasedBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value848745940780710882736675835731661
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax85.784.987.585.985.187.185.384.087.487.087.4
Percentage of RegulatedAndUnregulatedOperatingRevenue84.983.987.183.884.187.183.483.085.685.786.9
Percentage of RegulatedAndUnregulatedOperatingRevenue awk:RegulatedBusiness98.998.799.597.198.699.997.598.597.498.399.2

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value24952245252476624394240092354622682222382185421464212232088020471197281948219361189661861018482179711770617417172411710516732162631613015715154261527415069152281497714769147181459914412140871477614538143471412814079139831377313452
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value1608160115181338139819341356139114601508154414921456130712811371141414231440140614031433148715161625151614731244127414921354175515931776177717431676
Percentage of Assets6.46.56.15.55.88.26.06.36.77.07.37.17.16.66.67.17.57.67.87.87.98.28.68.99.79.39.17.98.39.89.011.510.612.012.111.911.3
Percentage of Assets6.46.56.15.55.88.26.06.36.77.07.37.17.16.66.67.17.57.67.87.87.98.28.68.99.79.39.17.98.39.89.011.510.612.012.111.911.3
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value8998928911110107510371008106010561019999973818604599600570555637545523512496497329310314309286
Percentage of Assets3.63.63.64.64.54.44.44.84.84.74.74.74.03.13.13.13.03.03.43.03.02.92.92.92.01.91.92.01.9
Percentage of Assets3.63.63.64.64.54.44.44.84.84.74.74.74.03.13.13.13.03.03.43.03.02.92.92.92.01.91.92.01.9
Percentage of Assets us-gaap:OperatingSegments awk:MarketBasedBusinesses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, awk:RegulatedBusiness


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value224452203222357219462153620575203181978719338189371868018415181971781717602173901698216632164051602015780154721525815091147771443114343141611385713448
Percentage of Assets90.089.890.390.089.787.489.689.088.588.288.088.288.990.390.489.889.589.488.889.189.188.888.588.288.388.788.990.189.889.2
Percentage of Assets90.089.890.390.089.787.489.689.088.588.288.088.288.990.390.489.889.589.488.889.189.188.888.588.288.388.788.990.189.889.2
Percentage of Assets us-gaap:OperatingSegments awk:RegulatedBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities 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
Value2495224525247662439424009235462268222238218542146421223208802047119728194821936118966186101848217971177061741717241171051673216263161301571515426152741506915228149771476914718145991441214087147761453814347141281407913452
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

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value66906583645465126338624361216190602759325864586057365451538555185384528752185238515350825049516550544993491547274632457245074443444743214250423542584157415041324003400541064546
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.826.826.126.726.426.527.027.827.627.627.628.128.027.627.628.528.428.428.229.129.129.229.330.230.230.730.531.430.430.530.530.230.530.030.228.729.329.029.429.30.029.80.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetTransitionAssetObligation


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value-106.0-106.0-106.0-94.0-94.0-94.0-94.0-102.0-102.0-102.0-102.0-140.0-140.0-140.0-140.0-147.0-147.0-147.0-147.0-126.0-126.0-126.0-126.0-116.0-116.0
Percentage of StockholdersEquity-1.6-1.6-1.6-1.4-1.5-1.5-1.5-1.6-1.7-1.7-1.7-2.4-2.4-2.6-2.6-2.7-2.7-2.8-2.8-2.4-2.4-2.5-2.5-2.2-2.4
Percentage of Assets-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.5-0.5-0.5-0.5-0.7-0.7-0.7-0.7-0.8-0.8-0.8-0.8-0.7-0.7-0.7-0.7-0.7-0.7
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetTransitionAssetObligation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value65646362616160585757565553474947464442403937363531
Percentage of StockholdersEquity1.01.01.01.01.01.01.00.90.91.01.00.90.90.90.90.90.90.80.80.80.80.70.70.70.6
Percentage of Assets0.30.30.30.30.30.30.30.30.30.30.30.30.30.20.30.20.20.20.20.20.20.20.20.20.2
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-6.0-7.0-7.0-7.0-7.0-9.0-3.0-3.0-3.0-4.010.023161610.0
Percentage of StockholdersEquity-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.10.20.40.30.30.2
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.10.10.10.1
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value-46.0-48.0-49.0-38.0-39.0-41.0-36.0-46.0-47.0-47.0-34.0-60.0-69.0-75.0-79.0-87.0-85.0-82.0-86.0-99.0-96.0-87.0-88.0-79.0-80.0-82.0-82.0-35.0-116.0-69.958-71.446-63.203-64.677-82.251-18.383
Percentage of StockholdersEquity-0.7-0.7-0.8-0.6-0.6-0.7-0.6-0.7-0.8-0.8-0.6-1.0-1.2-1.4-1.5-1.6-1.6-1.6-1.6-1.9-1.9-1.7-1.7-1.5-1.6-1.6-1.7-0.7-2.6-1.7-1.7-1.6-1.6-2.0-0.4
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.4-0.4-0.4-0.4-0.4-0.5-0.6-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.2-0.8-0.5-0.50.0-0.50.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value67656757674767396730671367006695668366686657664766376438643264236416640063886388638263686351634963246314630262626223616461566142614058885637
Percentage of StockholdersEquity101.1102.6104.5103.5106.2107.5109.5108.2110.9112.4113.5113.4115.7118.1119.4116.4119.2121.1122.4122.0123.9125.3125.8122.9125.1126.5128.2132.5140.1148.5149.0153.4153.3143.4124.0
Percentage of Assets27.127.627.227.628.028.529.530.130.631.131.431.832.432.633.033.233.834.434.635.536.036.636.837.137.838.839.141.642.343.643.70.045.60.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value2.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.01.7531.751.7471.7461.61.6
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value332235102157-7.0-83.0-207.0-123.0-273.0-353.0-464.0-432.0-537.0-617.0-723.0-573.0-702.0-759.0-873.0-839.0-921.0-991.0-1073.0-1050.0-1162.0-1224.0-1296.0-1496.0-1665.0-1950.571-1959.235-2082.263-2076.287-1705.594-1079.118
Percentage of StockholdersEquity5.03.61.62.4-0.1-1.3-3.4-2.0-4.5-6.0-7.9-7.4-9.4-11.3-13.4-10.4-13.0-14.4-16.7-16.0-17.9-19.5-21.3-20.3-23.0-24.5-26.4-31.6-37.5-47.0-47.4-52.0-51.8-41.5-23.7
Percentage of Assets1.31.00.40.6-0.0-0.4-0.9-0.6-1.2-1.6-2.2-2.1-2.6-3.1-3.7-3.0-3.7-4.1-4.7-4.7-5.2-5.7-6.2-6.1-6.9-7.5-8.0-9.9-11.3-13.8-13.90.0-15.40.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value-363.0-363.0-348.0-348.0-348.0-348.0-338.0-338.0-338.0-338.0-297.0-297.0-297.0-297.0-247.0-247.0-247.0-274.0-213.0-214.0-214.0-210.0-143.0-57.0-30.0-17.0-11.0-5.00.0-0.0190.00.0-0.0070.0
Percentage of StockholdersEquity-5.4-5.5-5.4-5.3-5.5-5.6-5.5-5.5-5.6-5.7-5.1-5.1-5.2-5.4-4.6-4.5-4.6-5.2-4.1-4.1-4.2-4.1-2.8-1.1-0.6-0.3-0.2-0.10.0-0.00.00.0-0.00.0
Percentage of Assets-1.5-1.5-1.4-1.4-1.4-1.5-1.5-1.5-1.5-1.6-1.4-1.4-1.5-1.5-1.3-1.3-1.3-1.5-1.2-1.2-1.2-1.2-0.8-0.3-0.2-0.1-0.1-0.00.0-0.00.00.00.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


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
Value15701466190619671896180112857997416917818008337297208608087677848016916386578798907296617567076875506135454914996426065891397147914931305534499
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.36.07.78.17.97.65.73.63.43.23.73.84.13.73.74.44.34.14.24.53.93.73.85.15.34.54.14.84.64.53.74.03.63.33.44.44.24.29.510.210.49.23.83.7

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
Value706954756056955660946463130866855559364787546526645751442423743230263220212418129.5021415131313232012229.54213
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 Assets0.30.32.22.32.42.40.30.40.30.30.60.40.30.30.30.50.30.40.40.30.30.40.30.40.90.10.10.50.20.20.20.20.10.10.20.10.10.10.10.10.10.10.10.20.10.00.20.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value10499576599605589911168786159116978283122931059972
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.42.32.52.52.50.40.50.40.40.70.60.50.40.40.60.50.60.50.4

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value311274321358298292294335337307301347324273272312288250269302240220255232
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.11.31.51.21.21.31.51.51.41.41.71.61.41.41.61.51.31.51.71.41.31.51.4

Inventory Raw Materials And Supplies

us-gaap:InventoryRawMaterialsAndSupplies

us-gaap:InventoryRawMaterialsAndSupplies


Inventory
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
Value5252474951504446484441424242414241413940424138373838373736353235333129313130283031302829
Percentage of InventoryRawMaterialsAndSupplies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.2

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


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
Value18316812714213711911811591859593160145113151151148118105484231314163452827312838314130805762547174614852
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.50.60.60.50.50.50.40.40.40.40.80.70.60.80.80.80.60.60.30.20.20.20.20.40.30.20.20.20.20.30.20.30.20.60.40.40.40.50.50.40.30.4

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value263692593425614251332474524351239412380723355234762320422734223612199521716209462057520189199541937619058187451850417269
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets105.7105.7103.4103.0103.1103.4105.6107.1106.9109.4109.3108.9109.2111.5111.5108.2108.5108.5108.0107.8107.6107.6107.3107.1

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
Value61556029590458665801576357095656555758535795567155845518547052655184506149624817474146474571262247239248239243233228223215207199189180173164161161153143117
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 Assets24.724.623.824.024.224.525.225.425.427.327.327.227.328.028.127.227.327.226.826.826.826.726.51.51.51.51.51.51.61.51.51.51.41.41.41.31.31.21.11.11.11.11.00.9

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
Value2021419905197101926718944185881823218151177981762317409170631677716477162461568115391151281499214559143171409813933136051335713098130291279912582124691239112112119271179211739115341138711139110211078710599105551120110677
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 Assets81.081.279.679.078.978.980.481.681.482.182.081.782.083.583.481.081.281.381.181.080.980.980.879.579.880.580.881.481.681.682.279.579.679.879.879.079.079.174.674.273.974.779.679.4

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-11-302013-09-302013-06-302013-03-312012-12-312012-11-302012-09-302012-06-302012-03-312011-12-312011-11-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1511151115041504150614991501157615751575157515711621137913791373137313451345131313131313130213121209120812081208120812081207120712071207120712071207120712071195119511951195119512041250119511951250
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.16.26.16.26.36.46.67.17.27.37.47.57.97.07.17.17.27.27.37.37.47.57.67.77.27.47.57.77.87.98.00.07.98.18.28.20.08.38.48.58.10.08.28.38.58.98.58.79.3

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:CustomerRelationships


Finite
Period End2020-12-31
Value49
Percentage of FiniteLivedIntangibleAssetsNet100.0
Percentage of Assets0.2
Percentage of Assets us-gaap:CustomerRelationships0.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-31
Value6.0
Percentage of FiniteLivedIntangibleAssetsNet12.2
Percentage of Assets0.0
Percentage of Assets us-gaap:OtherIntangibleAssets0.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value94989597991011031091121160.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.40.40.40.40.40.40.50.50.50.50.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


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
Value2001991962022012032072012025763767081767370727275797978687067695960606061596263595956575851515053
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.80.80.80.80.90.90.90.90.30.30.40.30.40.40.40.40.40.40.40.40.50.50.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.4

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
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
Value146134189162169152203149140130175141139133195144134108154135148116126281283203285260192183264209178166279202183162243190159132199138
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.50.80.70.70.60.90.70.60.60.80.70.70.71.00.70.70.60.80.80.80.70.71.61.71.31.81.71.21.21.81.41.21.11.91.41.31.21.61.31.10.91.41.0

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value506466591505512476596490429406556455530495630498490453609530377368493395
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.01.92.42.12.12.02.62.22.01.92.62.22.62.53.22.62.62.43.32.92.12.12.92.4

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


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
Value171024512881226021132767204514881317215620941748295125392325174726612418239219281740161415331165151212271240105812341197123511411049958994100510177431489138013271134774607
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.910.011.69.38.811.89.06.76.010.09.98.414.412.911.99.014.013.012.910.79.89.38.96.89.07.57.76.78.07.88.27.57.06.56.86.97.15.310.19.59.38.05.54.5

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


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
Value17017121517916216417417217720419616915215916715112513511211811183144338248267363282231212241281198189239321255208223232222166193189
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.90.70.70.70.80.80.81.00.90.80.70.80.90.80.70.70.60.70.60.50.82.01.51.62.31.81.51.41.61.81.31.31.62.21.81.51.51.61.61.21.41.4

Taxes Payable Current

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


Taxes
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
Value6576506458644678616445674864336147673145395826464155244637543246375135433959364747654645
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.20.30.20.30.20.40.30.30.20.30.20.30.20.30.20.40.20.30.20.30.20.30.20.30.20.30.20.40.20.30.20.30.20.30.30.40.20.30.30.50.30.3

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value96568664763868096320589359025902591459605491561252485239524453055312531853255.2388315.34269753995389
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets39.038.236.035.034.232.833.333.934.334.834.035.734.034.334.834.835.536.036.20.00.038.336.5

us-gaap:LongTermDebt dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

awk:AmericanWaterCapitalCorpAWCC, awk:SeniorNoteSeriesH655Due2023, us-gaap:SeniorNotes


Long
Period End2021-05-10
Value14
Percentage of LongTermDebt0.0
Percentage of Assets0.0
Percentage of Assets awk:AmericanWaterCapitalCorpAWCC awk:SeniorNoteSeriesH655Due2023 us-gaap:SeniorNotes0.0

us-gaap:LongTermDebt us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value10390963496569644965686678664866686667628763878316706681468097357633363166320
Percentage of LongTermDebt0.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0
Percentage of Assets41.639.339.039.540.236.838.239.039.735.536.037.532.834.535.038.033.433.934.2
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Debt And Capital Lease Obligations

us-gaap:DebtAndCapitalLeaseObligations

us-gaap:DebtAndCapitalLeaseObligations


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312011-12-312011-09-302011-06-302010-12-31
Value933386447576649857595928550952445389539253935452
Percentage of DebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.738.135.733.431.234.434.234.836.537.137.638.7

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value10343932593299580958986218639864086427562756975706345639664906672565057445749584258505850586259405433542854325212
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets41.538.037.739.339.936.638.138.939.535.235.736.331.032.433.334.529.830.931.132.533.033.634.034.732.533.433.734.6

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


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
Value122838379757578767675787884746674706867908970685448363736373738364098114393840383639424547
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.30.30.30.30.30.30.30.30.30.40.40.40.40.30.40.40.40.40.50.50.40.40.30.30.20.20.20.20.20.30.20.30.70.80.30.30.30.30.30.30.30.30.4

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value7984818384878994971010.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.30.30.30.30.30.40.40.40.40.50.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:FinancialInstrument

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

awk:OperatingandMaintenanceAgreement


Lessee
Period End2021-06-302021-03-312020-09-30
Value525256
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0
Percentage of Assets0.20.20.2
Percentage of Assets awk:OperatingandMaintenanceAgreement0.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LandBuildingsAndImprovements


Lessee
Period End2020-12-31
Value52
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive0.0
Percentage of Assets0.2
Percentage of Assets us-gaap:LandBuildingsAndImprovements0.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value66906583645465126338624361216190602759325864586057365451538555185384528752185238515350825049516550544993491547274632457245074443444743214250423542584157415041324003400541064546
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.826.826.126.726.426.527.027.827.627.627.628.128.027.627.628.528.428.428.229.129.129.229.330.230.230.730.531.430.430.530.530.230.530.030.228.729.329.029.429.30.029.80.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetTransitionAssetObligation


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value-106.0-106.0-106.0-94.0-94.0-94.0-94.0-102.0-102.0-102.0-102.0-140.0-140.0-140.0-140.0-147.0-147.0-147.0-147.0-126.0-126.0-126.0-126.0-116.0-116.0
Percentage of StockholdersEquity-1.6-1.6-1.6-1.4-1.5-1.5-1.5-1.6-1.7-1.7-1.7-2.4-2.4-2.6-2.6-2.7-2.7-2.8-2.8-2.4-2.4-2.5-2.5-2.2-2.4
Percentage of Assets-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.5-0.5-0.5-0.5-0.7-0.7-0.7-0.7-0.8-0.8-0.8-0.8-0.7-0.7-0.7-0.7-0.7-0.7
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetTransitionAssetObligation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value65646362616160585757565553474947464442403937363531
Percentage of StockholdersEquity1.01.01.01.01.01.01.00.90.91.01.00.90.90.90.90.90.90.80.80.80.80.70.70.70.6
Percentage of Assets0.30.30.30.30.30.30.30.30.30.30.30.30.30.20.30.20.20.20.20.20.20.20.20.20.2
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-6.0-7.0-7.0-7.0-7.0-9.0-3.0-3.0-3.0-4.010.023161610.0
Percentage of StockholdersEquity-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.10.20.40.30.30.2
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.10.10.10.1
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value-46.0-48.0-49.0-38.0-39.0-41.0-36.0-46.0-47.0-47.0-34.0-60.0-69.0-75.0-79.0-87.0-85.0-82.0-86.0-99.0-96.0-87.0-88.0-79.0-80.0-82.0-82.0-35.0-116.0-69.958-71.446-63.203-64.677-82.251-18.383
Percentage of StockholdersEquity-0.7-0.7-0.8-0.6-0.6-0.7-0.6-0.7-0.8-0.8-0.6-1.0-1.2-1.4-1.5-1.6-1.6-1.6-1.6-1.9-1.9-1.7-1.7-1.5-1.6-1.6-1.7-0.7-2.6-1.7-1.7-1.6-1.6-2.0-0.4
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.4-0.4-0.4-0.4-0.4-0.5-0.6-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.2-0.8-0.5-0.50.0-0.50.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value67656757674767396730671367006695668366686657664766376438643264236416640063886388638263686351634963246314630262626223616461566142614058885637
Percentage of StockholdersEquity101.1102.6104.5103.5106.2107.5109.5108.2110.9112.4113.5113.4115.7118.1119.4116.4119.2121.1122.4122.0123.9125.3125.8122.9125.1126.5128.2132.5140.1148.5149.0153.4153.3143.4124.0
Percentage of Assets27.127.627.227.628.028.529.530.130.631.131.431.832.432.633.033.233.834.434.635.536.036.636.837.137.838.839.141.642.343.643.70.045.60.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value2.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.02.01.7531.751.7471.7461.61.6
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value332235102157-7.0-83.0-207.0-123.0-273.0-353.0-464.0-432.0-537.0-617.0-723.0-573.0-702.0-759.0-873.0-839.0-921.0-991.0-1073.0-1050.0-1162.0-1224.0-1296.0-1496.0-1665.0-1950.571-1959.235-2082.263-2076.287-1705.594-1079.118
Percentage of StockholdersEquity5.03.61.62.4-0.1-1.3-3.4-2.0-4.5-6.0-7.9-7.4-9.4-11.3-13.4-10.4-13.0-14.4-16.7-16.0-17.9-19.5-21.3-20.3-23.0-24.5-26.4-31.6-37.5-47.0-47.4-52.0-51.8-41.5-23.7
Percentage of Assets1.31.00.40.6-0.0-0.4-0.9-0.6-1.2-1.6-2.2-2.1-2.6-3.1-3.7-3.0-3.7-4.1-4.7-4.7-5.2-5.7-6.2-6.1-6.9-7.5-8.0-9.9-11.3-13.8-13.90.0-15.40.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value-363.0-363.0-348.0-348.0-348.0-348.0-338.0-338.0-338.0-338.0-297.0-297.0-297.0-297.0-247.0-247.0-247.0-274.0-213.0-214.0-214.0-210.0-143.0-57.0-30.0-17.0-11.0-5.00.0-0.0190.00.0-0.0070.0
Percentage of StockholdersEquity-5.4-5.5-5.4-5.3-5.5-5.6-5.5-5.5-5.6-5.7-5.1-5.1-5.2-5.4-4.6-4.5-4.6-5.2-4.1-4.1-4.2-4.1-2.8-1.1-0.6-0.3-0.2-0.10.0-0.00.00.0-0.00.0
Percentage of Assets-1.5-1.5-1.4-1.4-1.4-1.5-1.5-1.5-1.5-1.6-1.4-1.4-1.5-1.5-1.3-1.3-1.3-1.5-1.2-1.2-1.2-1.2-0.8-0.3-0.2-0.1-0.1-0.00.0-0.00.00.00.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value2000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.01807000.01801000.01799000.01795000.01793000.01791000.01790000.01784000.01781000.01779000.01777000.01770000.01767000.01763000.01762000.01757000.01755000.01754000.01753000.01750000.01746000.0
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 Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value67656757674767396730671367006695668366686657664766376438643264236416640063886388638263686351634863246313630162976290627262616251624362326222621361986192618061736170616461566140
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 Assets27.127.627.227.628.028.529.530.130.631.131.431.832.432.633.033.233.834.434.635.536.036.636.837.137.838.839.140.140.841.141.641.141.742.242.342.643.044.041.842.543.043.643.745.6

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
Value332235102157-7.0-83.0-207.0-123.0-273.0-353.0-464.0-432.0-537.0-617.0-723.0-573.0-702.0-759.0-873.0-839.0-921.0-991.0-1073.0-1049.665-1162.346-1224.008-1295.549-1333.164-1374.174-1427.809-1495.698-1505.191-1555.993-1607.321-1664.955-1675.678-1785.039-1847.75-1848.801-1848.338-1945.185-1950.571-1959.235-2076.287
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 Assets1.31.00.40.6-0.0-0.4-0.9-0.6-1.2-1.6-2.2-2.1-2.6-3.1-3.7-3.0-3.7-4.1-4.7-4.7-5.2-5.7-6.2-6.1-6.9-7.5-8.0-8.5-8.9-9.3-9.9-9.9-10.4-10.9-11.3-11.5-12.4-13.1-12.5-12.7-13.6-13.8-13.9-15.4

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-46.0-48.0-49.0-38.0-39.0-41.0-36.0-46.0-47.0-47.0-34.0-60.0-69.0-75.0-79.0-87.0-85.0-82.0-86.0-99.0-96.0-87.0-88.0-79.175-80.053-81.503-81.868-35.942-34.671-35.151-34.635-109.901-112.468-114.286-116.191-91.507-93.89-95.549-97.677-68.555-68.696-69.958-71.446-64.677
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.4-0.4-0.4-0.4-0.4-0.5-0.6-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.2-0.2-0.2-0.2-0.7-0.8-0.8-0.8-0.6-0.7-0.7-0.7-0.5-0.5-0.5-0.5-0.5

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value363363348348348348338338338338297297297297247247247274213214214210143563016101010105.0435.0435.0435.0430.00.00.00.00.00.0190.0
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.00.0
Percentage of Assets1.51.51.41.41.41.51.51.51.51.61.41.41.51.51.31.31.31.51.21.21.21.20.80.30.20.10.10.10.10.10.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value341179438457351180438465312168394467306219463462247277331323437219198257389205244207398140149220418168148232313100161187289121175
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue34.120.247.542.437.721.348.645.935.420.746.447.835.928.856.449.429.336.641.341.348.828.028.535.246.027.336.129.148.119.423.532.450.322.623.936.340.915.026.430.038.719.131.1

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-471.0-363.0-615.0-488.0-508.0-450.0-691.0-437.0-466.0-351.0-491.0-396.0-763.0-386.0-651.0-386.0-350.0-285.0-573.0-421.018-476.807-320.659-246.516-292.648-283.167-232.974-205.2-333.927-259.98-231.677-227.71-197.0-215.025-199.936229-306.396-230.576-209.237-166.188-240.791-174.726-193.444-137.782
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-47.1-40.9-66.6-45.2-54.6-53.3-76.6-43.1-52.8-43.2-57.8-40.6-89.4-50.7-79.3-41.2-41.5-37.7-71.4-53.8-53.2-41.0-35.3-40.0-33.5-30.9-30.2-46.9-31.4-32.0-35.8-28.9-25.9-26.837.1-47.9-30.1-31.0-27.2-38.5-23.3-30.5-24.3

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value135-293.0154251737682281.0155110140-52.0472166154-52.0911427167-30.34422149-15.425-64.48528-35.883120-126.4119074-17.682-197.50634-382.40972-80.9171085.07842-111.90179-47.831
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue13.5-33.016.72.318.691.025.30.117.613.516.5-5.355.321.818.8-5.610.81.933.88.6-3.428.47.0-2.1-7.63.8-5.317.0-15.212.511.8-2.6-23.74.6-61.811.4-10.616.10.86.8-14.912.6-8.4

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5.0-477.0-23.0-6.016498-25.0291.0-73.0431915-1.0-39.029-12.06.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.5-53.7-2.5-0.61.759.0-2.82.90.1-9.05.11.91.8-0.1-4.83.1-1.40.8

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


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
Value1581571531541521451521441421441411411341291141281261241201191151161121111081071051061051061031021019910096929288888788107848182
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value6.057-21.0199.08.02413-49.022-5.05.030-27.0273.049-14.0-6.012
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value341179438457351180438465312168394467306219463462247277331323437219198257389205244207398140149220418168148232313100161187289121175
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue34.120.247.542.437.721.348.645.935.420.746.447.835.928.856.449.429.336.641.341.348.828.028.535.246.027.336.129.148.119.423.532.450.322.623.936.340.915.026.430.038.719.131.1

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
Value20713314526417612498240170113112187162106-1.020313193101148137829917412380931521096859150101575515310741641378447401247230
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 RegulatedAndUnregulatedOperatingRevenue20.715.015.724.518.914.710.923.719.313.913.219.219.013.9-0.121.715.512.312.615.916.611.012.619.415.711.512.818.014.510.08.418.214.09.18.118.514.46.810.117.912.57.76.416.611.55.4

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-27.0-19.0-32.0-20.0-24.0-21.0-36.0-19.0-7.0-17.0-20.0-19.0-18.0-10.0-123.0-23.0-18.0-8.0-10.0-11.0-11.0-11.0-8.0-12.0-11.0-8.0
Percentage of NetIncomeLoss-13.0-14.3-22.1-7.6-13.6-16.9-36.7-7.9-4.1-15.0-17.9-10.2-11.1-9.412300.0-11.3-13.7-8.6-9.9-7.4-8.0-13.4-8.1-6.9-8.9-10.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-2.7-2.1-3.5-1.9-2.6-2.5-4.0-1.9-0.8-2.1-2.4-1.9-2.1-1.3-15.0-2.5-2.1-1.1-1.2-1.2-1.3-1.5-1.0-1.3-1.4-1.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:CorporateNonSegment675.0475.0640.0400.0600.0525.0600.0316.7140.0283.3500.0316.7360.0200.02050.0383.3360.0133.3166.7220.0275.0220.0220.2245.1220.0200.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value191723232322-18.023212014-7.013129.0149.07.0137.0136.01112127.0
Percentage of NetIncomeLoss9.212.815.98.713.117.7-18.49.612.417.712.5-3.78.011.3-900.06.96.97.512.94.79.57.311.16.99.88.7
Percentage of RegulatedAndUnregulatedOperatingRevenue1.91.92.52.12.52.6-2.02.32.42.51.6-0.71.51.61.11.51.10.91.60.81.60.81.41.31.51.0
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:MarketBasedBusinesses13.012.416.316.517.417.2-13.116.915.914.910.2-5.611.412.07.814.08.76.811.56.411.35.38.710.012.08.0

us-gaap:OperatingSegments, awk:RegulatedBusiness


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2151351542611771231522361561101182131671041132121409498152135879617412281
Percentage of NetIncomeLoss103.9101.5106.298.9100.699.2155.198.391.897.3105.4113.9103.198.1-11300.0104.4106.9101.197.0102.798.5106.197.0100.099.1101.2
Percentage of RegulatedAndUnregulatedOperatingRevenue21.515.216.724.219.014.616.923.317.713.513.921.819.613.713.822.616.612.412.216.316.311.712.319.415.611.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments awk:RegulatedBusiness25.117.919.627.622.017.119.726.720.716.116.524.922.415.615.925.218.814.314.118.418.913.714.522.317.813.2

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value207133264176124240170113112187162106-1.020313193101148137829917312380931521096859150101575515310741401378447401247230
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.062.1100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue20.715.024.518.914.723.719.313.913.219.219.013.9-0.121.715.512.312.615.916.611.012.619.415.711.512.818.014.510.08.418.214.09.18.118.514.46.86.317.912.57.76.416.611.55.4
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value13314526417612498240170113112185162106-1.02031319310114813782981731238093152
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue15.015.724.518.914.710.923.719.313.913.219.019.013.9-0.121.715.512.312.615.916.611.012.619.415.711.512.818.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-471.0-363.0-615.0-488.0-508.0-450.0-691.0-437.0-466.0-351.0-491.0-396.0-763.0-386.0-651.0-386.0-350.0-285.0-573.0-421.018-476.807-320.659-246.516-292.648-283.167-232.974-205.2-333.927-259.98-231.677-227.71-197.0-215.025-199.936229-306.396-230.576-209.237-166.188-240.791-174.726-193.444-137.782
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-47.1-40.9-66.6-45.2-54.6-53.3-76.6-43.1-52.8-43.2-57.8-40.6-89.4-50.7-79.3-41.2-41.5-37.7-71.4-53.8-53.2-41.0-35.3-40.0-33.5-30.9-30.2-46.9-31.4-32.0-35.8-28.9-25.9-26.837.1-47.9-30.1-31.0-27.2-38.5-23.3-30.5-24.3

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value410342508444462408539403386326450397375364470362332270383331313284369312209192314235216213248204242233302230215176243194184142
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value2.02.04.01.02.01.01.02.04.07.0192227282123400.00.00.00.00.00.00.00.0
Percentage of PaymentsToAcquirePropertyPlantAndEquipment0.50.60.80.20.40.20.20.51.02.14.25.57.27.74.56.412.00.00.00.00.00.00.00.00.0

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2.02.03.01.03.03.03.02.04.04.04.02.01.06.0113.03.0
Percentage of PaymentsToAcquirePropertyPlantAndEquipment0.50.60.60.20.60.70.60.51.01.20.90.50.31.62.30.80.9

us-gaap:OperatingSegments, awk:RegulatedBusiness


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value406338501442457404535399378315427373347330438336289
Percentage of PaymentsToAcquirePropertyPlantAndEquipment99.098.898.699.598.999.099.399.097.996.694.994.092.590.793.292.887.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value135-293.0154251737682281.0155110140-52.0472166154-52.0911427167-30.34422149-15.425-64.48528-35.883120-126.4119074-17.682-197.50634-382.40972-80.9171085.07842-111.90179-47.831
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue13.5-33.016.72.318.691.025.30.117.613.516.5-5.355.321.818.8-5.610.81.933.88.6-3.428.47.0-2.1-7.63.8-5.317.0-15.212.511.8-2.6-23.74.6-61.811.4-10.616.10.86.8-14.912.6-8.4

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-08-092018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11002.0848711558.03397.011822.03.0130013405.010.0131362200.05510.01.2735550.05000.00.04011.3590.01.3783000.00.358140.160.075110.2981061610.0921.101
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.00.0100.00.00.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfLongTermDebt dei:LegalEntity, us-gaap:LongtermDebtType

awk:AmericanWaterCapitalCorpAWCC, us-gaap:SeniorNotes


Proceeds
Period End2021-05-102020-04-142019-05-132018-08-092017-08-10
Value1086989109013001330
Percentage of ProceedsFromIssuanceOfLongTermDebt0.00.00.0100.00.0

us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:DebtInstrument

awk:VariousDebt


Proceeds
Period End2021-06-302021-03-312020-09-30
Value0.02.087
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
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
Value33925761001606.03427.0134121962111136.05623282.04.01247.02.01141822.6033.0911011331.1732.1924797.443.3172.3922101031516.2291.3564.4811.57162761534.67638
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value10910099100100909090918282828174747474676767666161616155555555494949490.088444040404038383838
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Dividends

us-gaap:Dividends

us-gaap:Dividends


Dividends
Period End2021-06-302020-09-302020-06-302019-09-302019-06-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1101001009090616155555555505050490.0098844404040403838383836
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Dividends us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividendsus-gaap:
Period End2021-06-302020-09-302020-06-302019-09-302019-06-30
Value1101001009090
Percentage of Dividends100.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value17.514.2-0.825.00.2410.220.0040.2450.2510.2570.0160.2750.270.2430.1340.4030.4180.35900.3910.3910.397-0.0050.3940.3960.4-0.0070.4060.3980.3970.0020.3950.3960.3510.3960.4090.4180.3790.4070.4070.3880.406
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value20931872231030142868251023102155
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value10641105993111010988919801046103910211045
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value12211097106169233195177180158118112
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


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
Value192114136.08.01013192022
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:AccountsReceivableAllowanceForCreditLossAssetsHeldForSale

awk:AccountsReceivableAllowanceForCreditLossAssetsHeldForSale


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value8000000.0-4000000.0-1000000.000-2000000.0
Percentage of AccountsReceivableAllowanceForCreditLossAssetsHeldForSale100.0100.0100.00.00.0100.0

awk:AlternativeRevenuePrograms us-gaap:StatementBusinessSegments

awk:AlternativeRevenuePrograms

awk:RegulatedBusiness


Alternative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-302018-06-30
Value7.09.0-5.02.0217.0-7.0-1.0178.011
Percentage of AlternativeRevenuePrograms100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:BenefitCostsNonOperatingNet

awk:BenefitCostsNonOperatingNet


Benefit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-19000000.0-20000000.0-12000000.0-12000000.0-12000000.0-13000000.0-4000000.0-4000000.0-4000000.0-4000000.0-10000000.0-5000000.0-2000000.0-3000000.02000000.02000000.02000000.03000000.0
Percentage of BenefitCostsNonOperatingNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:ContractWithCustomerLiabilityRevenueRecognizedDuringThePeriod

awk:ContractWithCustomerLiabilityRevenueRecognizedDuringThePeriod


Contract
Period End2021-06-302021-03-312020-06-302020-03-31
Value33482729
Percentage of ContractWithCustomerLiabilityRevenueRecognizedDuringThePeriod100.0100.0100.0100.0

awk:ContractwithCustomerAssetAdditions

awk:ContractwithCustomerAssetAdditions


Contractwith
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value191917141811
Percentage of ContractwithCustomerAssetAdditions100.0100.0100.0100.0100.0100.0

awk:ContractwithCustomerLiabilityAdditions

awk:ContractwithCustomerLiabilityAdditions


Contractwith
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value335729253036
Percentage of ContractwithCustomerLiabilityAdditions100.0100.0100.0100.0100.0100.0

awk:DefinedBenefitPlanNetPeriodicBenefitCostCreditBeforeSettlements us-gaap:RetirementPlanType

awk:DefinedBenefitPlanNetPeriodicBenefitCostCreditBeforeSettlements

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302020-09-302020-06-302019-09-302019-06-30
Value-1.04.05.01212
Percentage of DefinedBenefitPlanNetPeriodicBenefitCostCreditBeforeSettlements100.0100.0100.0100.0100.0

awk:OperatingandFinancingLeaseExpenses

awk:OperatingandFinancingLeaseExpenses


Operatingand
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4.03.04.03.03.04.04.04.04.0
Percentage of OperatingandFinancingLeaseExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:OperatingandFinancingLeasePayments

awk:OperatingandFinancingLeasePayments


Operatingand
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-09-302019-06-30
Value4.03.03.03.04.03.05.0
Percentage of OperatingandFinancingLeasePayments100.0100.0100.0100.0100.0100.0100.0

awk:PaymentsOfMakeWholePremiumOnEarlyDebtRedemption dei:LegalEntity

awk:PaymentsOfMakeWholePremiumOnEarlyDebtRedemption

awk:AmericanWaterCapitalCorpAWCC


Payments
Period End2021-06-14
Value15
Percentage of PaymentsOfMakeWholePremiumOnEarlyDebtRedemption100.0

awk:ProceedsFromIssuancesOfEmployeeStockPlansAndDirectStockPurchasePlanNet

awk:ProceedsFromIssuancesOfEmployeeStockPlansAndDirectStockPurchasePlanNet


Proceeds
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-3.011-4.0-7.05.0-7.0-7.01.0-2.0-7.01.0
Percentage of ProceedsFromIssuancesOfEmployeeStockPlansAndDirectStockPurchasePlanNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:ProceedsReceivedFromPaymentDueToTerminatedForwardSwaps us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

awk:ProceedsReceivedFromPaymentDueToTerminatedForwardSwaps

us-gaap:TreasuryLock, us-gaap:DesignatedAsHedgingInstrument


Proceeds
Period End2021-05-102020-04-08
Value1000000.0-6000000.0
Percentage of ProceedsReceivedFromPaymentDueToTerminatedForwardSwaps100.0100.0

awk:ProceedsRepaymentFromTermLoan

awk:ProceedsRepaymentFromTermLoan


Proceeds
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.0-500.00.0500
Percentage of ProceedsRepaymentFromTermLoan0.0100.00.0100.0

awk:ProceedsfromTermLoan

awk:ProceedsfromTermLoan


Proceedsfrom
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0.00.00.05000.00.0
Percentage of ProceedsfromTermLoan0.00.00.0100.00.00.0

awk:PublicUtilitiesGeneralRateCaseAuthorizations

awk:PublicUtilitiesGeneralRateCaseAuthorizations


Public
Period End2021-06-302021-03-312020-06-302020-03-31
Value2970135.0
Percentage of PublicUtilitiesGeneralRateCaseAuthorizations100.0100.0100.0100.0

awk:PublicUtilitiesGeneralRateCaseAuthorizations us-gaap:StatementGeographical

stpr:MO


Public
Period End2021-06-30
Value22
Percentage of PublicUtilitiesGeneralRateCaseAuthorizations75.9

stpr:NY


Public
Period End2021-06-30
Value7.0
Percentage of PublicUtilitiesGeneralRateCaseAuthorizations24.1

stpr:PA


Public
Period End2021-06-302021-02-252021-03-31
Value0.07070
Percentage of PublicUtilitiesGeneralRateCaseAuthorizations0.0100.00.0

awk:PublicUtilitiesGeneralRateCaseAuthorizationsAdditionalAnnualizedRevenue us-gaap:StatementGeographical

awk:PublicUtilitiesGeneralRateCaseAuthorizationsAdditionalAnnualizedRevenue

stpr:MO


Public
Period End2021-04-07
Value22
Percentage of PublicUtilitiesGeneralRateCaseAuthorizationsAdditionalAnnualizedRevenue100.0

awk:PublicUtilitiesGeneralRateCaseAuthorizationsAdditionalAnnualizedRevenue us-gaap:StatementGeographical, us-gaap:SubsequentEventType

stpr:MO, us-gaap:SubsequentEvent


Public
Period End2021-04-07
Value22
Percentage of PublicUtilitiesGeneralRateCaseAuthorizationsAdditionalAnnualizedRevenue100.0

awk:PublicUtilitiesInfrastructureChanges us-gaap:StatementGeographical

awk:PublicUtilitiesInfrastructureChanges

stpr:WV


Public
Period End2021-04-30
Value10000000.0
Percentage of PublicUtilitiesInfrastructureChanges100.0

awk:PublicUtilitiesInfrastructureChanges us-gaap:StatementGeographical, us-gaap:SubsequentEventType

stpr:WV, us-gaap:SubsequentEvent


Public
Period End2021-04-30
Value10000000.0
Percentage of PublicUtilitiesInfrastructureChanges100.0

awk:PublicUtilitiesInfrastructureSurchargeAuthorizations

awk:PublicUtilitiesInfrastructureSurchargeAuthorizations


Public
Period End2021-06-302021-03-312020-06-302020-03-31
Value14312730
Percentage of PublicUtilitiesInfrastructureSurchargeAuthorizations100.0100.0100.0100.0

awk:PublicUtilitiesInfrastructureSurchargeAuthorizations us-gaap:StatementGeographical

stpr:IL


Public
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.07.00.07.0
Percentage of PublicUtilitiesInfrastructureSurchargeAuthorizations0.022.60.023.3

stpr:IN


Public
Period End2021-06-302021-03-31
Value0.08.0
Percentage of PublicUtilitiesInfrastructureSurchargeAuthorizations0.025.8

stpr:NJ


Public
Period End2021-06-302020-06-302020-03-31
Value1410.010.0
Percentage of PublicUtilitiesInfrastructureSurchargeAuthorizations100.037.033.3

stpr:PA


Public
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.08.05.010.0
Percentage of PublicUtilitiesInfrastructureSurchargeAuthorizations0.025.818.533.3

stpr:TN


Public
Period End2021-06-302021-03-312020-06-30
Value0.03.02.0
Percentage of PublicUtilitiesInfrastructureSurchargeAuthorizations0.09.77.4

stpr:WV


Public
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.05.00.03.0
Percentage of PublicUtilitiesInfrastructureSurchargeAuthorizations0.016.10.010.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedCatchUpPeriodAmount us-gaap:StatementGeographical

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedCatchUpPeriodAmount

stpr:MO


Public
Period End2021-04-07
Value13
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedCatchUpPeriodAmount100.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedCatchUpPeriodAmount us-gaap:StatementGeographical, us-gaap:SubsequentEventType

stpr:MO, us-gaap:SubsequentEvent


Public
Period End2021-04-07
Value13
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedCatchUpPeriodAmount100.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedPayableToCustomers us-gaap:StatementGeographical

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedPayableToCustomers

stpr:MO


Public
Period End2021-04-07
Value25
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedPayableToCustomers100.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedPayableToCustomers us-gaap:StatementGeographical, us-gaap:SubsequentEventType

stpr:MO, us-gaap:SubsequentEvent


Public
Period End2021-04-07
Value25
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedAndUnprotectedPayableToCustomers100.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedPayableToCustomers us-gaap:StatementGeographical

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedPayableToCustomers

stpr:MO


Public
Period End2021-04-07
Value72
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedPayableToCustomers100.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedPayableToCustomers us-gaap:StatementGeographical, us-gaap:SubsequentEventType

stpr:MO, us-gaap:SubsequentEvent


Public
Period End2021-04-07
Value72
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesProtectedPayableToCustomers100.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesReductionInRevenue us-gaap:StatementGeographical

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesReductionInRevenue

stpr:MO


Public
Period End2021-04-07
Value25
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesReductionInRevenue100.0

stpr:WV


Public
Period End2021-04-30
Value1.0
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesReductionInRevenue0.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesReductionInRevenue us-gaap:StatementGeographical, us-gaap:SubsequentEventType

stpr:MO, us-gaap:SubsequentEvent


Public
Period End2021-04-07
Value25
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesReductionInRevenue100.0

stpr:WV, us-gaap:SubsequentEvent


Public
Period End2021-04-30
Value1.0
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesReductionInRevenue0.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesUnprotectedPayableToCustomers us-gaap:StatementGeographical

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesUnprotectedPayableToCustomers

stpr:MO


Public
Period End2021-04-07
Value74
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesUnprotectedPayableToCustomers100.0

awk:PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesUnprotectedPayableToCustomers us-gaap:StatementGeographical, us-gaap:SubsequentEventType

stpr:MO, us-gaap:SubsequentEvent


Public
Period End2021-04-07
Value74
Percentage of PublicUtilitiesNetOfExcessAccumulatedDeferredIncomeTaxesUnprotectedPayableToCustomers100.0

awk:PublicUtilitiesRequestedInfrastructureSurchargeAmount us-gaap:StatementGeographical, us-gaap:SubsequentEventType

awk:PublicUtilitiesRequestedInfrastructureSurchargeAmount

stpr:IN, us-gaap:SubsequentEvent


Public
Period End2021-01-15
Value8000000.0
Percentage of PublicUtilitiesRequestedInfrastructureSurchargeAmount100.0

awk:PublicUtilitiesRequestedRateAdjustmentAmount us-gaap:StatementGeographical

awk:PublicUtilitiesRequestedRateAdjustmentAmount

stpr:NJ


Public
Period End2021-03-02
Value29
Percentage of PublicUtilitiesRequestedRateAdjustmentAmount100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs


Allowance
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value3.0-1.03.07.010.09.0
Percentage of AllowanceForDoubtfulAccountsReceivableWriteOffs100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:BusinessCombinationConsiderationTransferred1


Business
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value143.01919215.0
Percentage of BusinessCombinationConsiderationTransferred1100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

awk:NewJerseyAmericanWater


Business
Period End2021-03-29
Value22
Percentage of BusinessCombinationConsiderationTransferred10.0

awk:PennsylvaniaAmericanWaterCompany


Business
Period End2021-04-06
Value235
Percentage of BusinessCombinationConsiderationTransferred10.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

awk:PennsylvaniaAmericanWaterCompany, us-gaap:SubsequentEvent


Business
Period End2021-04-06
Value235
Percentage of BusinessCombinationConsiderationTransferred10.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Business
Period End2021-08-052021-05-032020-11-042019-10-30
Value4.01.074137
Percentage of BusinessCombinationConsiderationTransferred10.00.00.00.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.0223-15.0-14.0-6.0256-10.05110.0184-6.07.05.017529303.0142-11.0151.0166283.895713322475.6631099.09524138140241875-2.66126146615231655
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2020-09-302020-06-022020-06-302019-12-062019-09-042019-09-302019-06-042019-06-302018-12-072018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.550.550.550.50.50.50.50.50.4550.910.4550.45500.830.4150.41500.750.3750.3750.680.340.340.310.620.3100.560.280.2800.250.250.250.230.230.230.450.220.220.220.210.21
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetReclassifiedToReceivable

us-gaap:ContractWithCustomerAssetReclassifiedToReceivable


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value118.05.0139.07.0
Percentage of ContractWithCustomerAssetReclassifiedToReceivable100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxesAndTaxCredits

us-gaap:DeferredIncomeTaxesAndTaxCredits


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value382633785838457850355360493319812773645989825259108127-0.338-0.348-109.34108-0.349-0.375
Percentage of DeferredIncomeTaxesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-1.00.00.0-1.00.0-1.0-1.0-1.00.0-1.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.00.00.0100.00.0100.0100.0100.00.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-6.0-7.0-7.0-7.0-8.0-8.0-8.0-8.0-8.0-8.0-7.0-6.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses0.00.0700.00.00.0800.00.0800.0800.0800.00.0600.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-8000000.0-8000000.0-9000000.0-9000000.0-8000000.0-8000000.0-9000000.0-9000000.0-9000000.0-8000000.0-7000000.0-7000000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0-1000000.00-1000000.0-1000000.0-1000000.00-1000000.0-1000000.0-1000000.01000000.00
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-0.012.5-0.011.112.512.5-0.011.111.112.5-14.3-0.0

us-gaap:DefinedBenefitPlanContributionsByEmployer us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value9.09.010.09.01210.010.09.07.07.01311
Percentage of DefinedBenefitPlanContributionsByEmployer100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value5.05.05.05.05.04.04.05.05.04.06.07.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value323227282828232323222424
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets640.0640.0540.0560.0560.0700.0575.0460.0460.0550.0400.0342.9

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2.02.03.03.03.03.04.04.04.03.04.05.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value161718181819202121201919
Percentage of DefinedBenefitPlanInterestCost800.0850.0600.0600.0600.0633.3500.0525.0525.0666.7475.0380.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-10.0-10.0-9.0-10.0-9.0-7.0-8.0-8.0-8.0-7.0-8.0-6.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-1.05.04.06.06.012121212129.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost10.0-55.6-40.0-66.7-85.7-150.0-150.0-150.0-171.4-150.0-150.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:Range, us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

srt:Maximum, awk:NewYorkWaterServiceCorporationPensionPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302020-09-30
Value-1000000.01000000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-09-302020-06-302019-06-30
Value0-1000000.00
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.00.00.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.01.01.01.01.01.01.01.01.01.01.02.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value9.09.07.08.08.08.07.07.07.07.09.08.0
Percentage of DefinedBenefitPlanServiceCost900.0900.0700.0800.0800.0800.0700.0700.0700.0700.0900.0400.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value42-57.0151163-91.0823140-87.0483119-73.0602426-72.0-124.01627.0155930-12.0062.01465
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value84-26.0-24.067504.0-29.01445-5.0-53.02961-20.0-55.03154-51.0-52.07062-49.0-62.54374638.758-15.3812357-3.307-30.0664483-18.775-62.452186-11.246-38.2141070-26.07-60.2143373-14.036
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseIncome us-gaap:StatementBusinessSegments

us-gaap:LeaseIncome

awk:RegulatedBusiness


Lease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-302018-06-30
Value2000000.01000000.02000000.03000000.02000000.03000000.01000000.01000000.02000000.02000000.02000000.0
Percentage of LeaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LitigationSettlementAmountAwardedToOtherParty dei:LegalEntity, us-gaap:LitigationCase

us-gaap:LitigationSettlementAmountAwardedToOtherParty

awk:WestVirginiaAmericanWaterCompany, awk:BindingAgreement


Litigation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-06-082017-09-212017-04-272016-09-30
Value0.0190.00.00.01919191923436565
Percentage of LitigationSettlementAmountAwardedToOtherParty0.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LitigationSettlementAmountAwardedToOtherParty us-gaap:LitigationCase

awk:BindingAgreement


Litigation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312018-12-312018-09-302018-06-082018-06-302018-03-312017-09-21
Value0.0126-125.50.00.01260.0-86.01260.0126126
Percentage of LitigationSettlementAmountAwardedToOtherParty0.0663.20.00.00.0663.20.00.00.0547.80.0293.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent


Oci
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value-12.00.02.0-6.08.00.01.0-14.0457.00.06.0-5.02.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.00.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.02.0-6.00.00.01.0-14.0-15.07.00.06.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-0.00.0100.0100.00.00.0100.0100.0-33.3100.00.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.00.00.02.0-6.00.00.01.0-14.0-15.07.00.06.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax100.00.00.0100.0100.00.00.0100.0100.0100.0100.00.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value00001000000.0-2000000.0001000000.0-6000000.0-4000000.02000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax0.00.00.00.0100.0100.00.00.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-312016-06-302016-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.01.0-11.01.02.0-5.010.01.00.0-13.0269.06.04.0-3.04.0-9.01.01.8181.905-24.6842.3831.6592.128-29.1220.1411.2621.488-10.361.460.6571.474
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.01.01.01.00.01.02.01.00.01.01.02.06.0-2.02.01.02.02.02.01.02.01.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent50.0100.0-9.1100.00.0-20.020.0100.00.0-7.73.822.2100.0-50.00.00.0-66.750.00.00.0-22.2100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.02.0-6.00.00.01.0-14.0-13.07.00.06.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-0.00.0100.0120.00.00.00.0107.7-50.077.80.0150.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-06-302020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value2.01.02.0-5.0269.06.04.08.0-2.0-3.04.013
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax


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
Value-1000000.0-1000000.0-1000000.0-1000000.00-1000000.0-2000000.0-1000000.00-1000000.0-1000000.0-2000000.0-6000000.02000000.0-2000000.0-1000000.0-2000000.0-2000000.0-2000000.0-1000000.0-2000000.0-1000000.0-1094000.0-1302000.0-1302000.0-1302000.09000.07000.08000.07000.0-2228000.0-2228000.0-2227000.0-2228000.0-1825000.0-1825000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax


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
Value-1000000.000-1000000.0002000000.00-1000000.001000000.01000000.02000000.0-1000000.02000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.05497000.0-833000.0-832000.0-832000.0-5000.0-4000.0-5000.0-5000.01424000.01424000.01425000.01424000.01167000.01167000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax100.00.00.0100.00.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value1.041-17.0-3.02218-10.05.018287.0-29.0-8.010.015-11.03218-12.0168.0242119-0.832132317
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromRemovalCosts

us-gaap:PaymentsForProceedsFromRemovalCosts


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
Value25183125272333302318262120202523151322182717332731142620201015191910181313101414158.5971511115.91
Percentage of PaymentsForProceedsFromRemovalCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsOfDebtIssuanceCosts


Payments
Period End2020-09-302019-09-302018-09-302017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.00.0120.04.00.00.01.0-0.2635.2630.03.3777.3930.00.00.00.00.00.00.5521.533.3321.4880.269
Percentage of PaymentsOfDebtIssuanceCosts0.00.0100.00.0100.00.00.0100.0100.0100.00.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.0150.01.05.0110.02.03.06.01.01.01.05.00.01.01.09.01.01.02.09.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation0.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired


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
Value363.0761919211505.05822174.03698.01671.07.02.01755.02.02221134410.0482.8823.1840.592.2797.104111.7662.8360.2270.04440.1040.8391.6123.3241.445-0.0280.0981.0440.528
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionAndOtherPostretirementBenefitContributions

us-gaap:PensionAndOtherPostretirementBenefitContributions


Pension
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
Value9.09.08.09.01210.08.09.07.07.011110.00.01213121111141414171412121614101019182929333322405162234826502237
Percentage of PensionAndOtherPostretirementBenefitContributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionAndOtherPostretirementBenefitExpense

us-gaap:PensionAndOtherPostretirementBenefitExpense


Pension
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-11.0-10.0-4.0-6.0-3.0-1.04.04.04.05.04.03.08.08.01315141511121615151515156.0176.0186.026.01819191919262020201717171722222222
Percentage of PensionAndOtherPostretirementBenefitExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromAdvancesForConstruction

us-gaap:ProceedsFromAdvancesForConstruction


Proceeds
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value167.09.04.07.07.07.02.08.03.04.0127.0431.3585.7652.6255.7565.1059.7275.4628.97.826.5314.5746.0825.1112.0674.4543.691-3.17
Percentage of ProceedsFromAdvancesForConstruction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value-510.0334237125-506.013931377-805.0237401-1087.0468278801-1014.0137131-101.01.0110211250-381.03821694135-388.4599919339-97.02713263-27.874
Percentage of ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfProductiveAssets

us-gaap:ProceedsFromSaleOfProductiveAssets


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.00.00.02.0311.01.0152.0261.06.06.05.04.00.04.03.01.01.00.0150.2053.5661.214130.1390.4220.2430.1690.1690.30.281.6440.085984612.9280.3876.4990.1580.0890.0510.0120.087
Percentage of ProceedsFromSaleOfProductiveAssets0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromShortTermDebt dei:LegalEntity, us-gaap:CreditFacility

us-gaap:ProceedsFromShortTermDebt

awk:AmericanWaterCapitalCorpAWCC, us-gaap:RevolvingCreditFacility


Proceeds
Period End2020-09-30
Value0.0
Percentage of ProceedsFromShortTermDebt0.0

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


Provision
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
Value7.011128.08.06.010.08.06.04.01110.09.03.08.010.07.04.09.09.03.06.09.5938.5186.3117.578109.0739.4347.588.5849.3136.0153.041135.425.7441.6582.8425.5626.1851.5892.8255.4977.0183.357
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount us-gaap:StatementGeographical

us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount

stpr:PA


Public
Period End2020-10-30
Value71
Percentage of PublicUtilitiesApprovedRateIncreaseDecreaseAmount100.0

us-gaap:PublicUtilitiesRequestedRateIncreaseDecreaseAmount us-gaap:StatementGeographical

us-gaap:PublicUtilitiesRequestedRateIncreaseDecreaseAmount

stpr:IA


Public
Period End2020-08-28
Value3.0
Percentage of PublicUtilitiesRequestedRateIncreaseDecreaseAmount100.0

us-gaap:PublicUtilitiesRequestedRateIncreaseDecreaseAmount us-gaap:StatementGeographical, us-gaap:SubsequentEventType

stpr:WV, us-gaap:SubsequentEvent


Public
Period End2021-04-30
Value32
Percentage of PublicUtilitiesRequestedRateIncreaseDecreaseAmount0.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-312016-06-302016-03-31
Value-1000000.0-1000000.0-1000000.0-1000000.00-1000000.0-2000000.0-1000000.01000000.0-1000000.0-1000000.0-2000000.0-6000000.02000000.0-2000000.0-2000000.0-2000000.0-1000000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-1000000.0-1000000.0-1000000.0-1000000.00-1000000.0-2000000.0-1000000.00-1000000.0-1000000.0-2000000.0-6000000.02000000.0-2000000.0-1000000.0-2000000.0-2000000.0-2000000.0-1000000.0-2000000.0-1000000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.0100.0100.00.00.0100.0100.0

us-gaap:RepaymentsOfConstructionLoansPayable

us-gaap:RepaymentsOfConstructionLoansPayable


Repayments
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
Value6.06.04.05.07.08.05.08.08.09.02.04.0124.06.05.07.04.0145.07.05.05.9435.6277.2844.1465.1655.8465.1825.277
Percentage of RepaymentsOfConstructionLoansPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfDebt dei:LegalEntity, us-gaap:DebtInstrument

us-gaap:RepaymentsOfDebt

awk:AmericanWaterCapitalCorpAWCC, awk:TermLoan


Repayments
Period End2021-03-31
Value500
Percentage of RepaymentsOfDebt100.0

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

awk:AmericanWaterCapitalCorpAWCC, awk:SeniorNoteSeriesD577Due2021, us-gaap:SeniorNotes


Repayments
Period End2021-05-10
Value251
Percentage of RepaymentsOfDebt0.0

awk:AmericanWaterCapitalCorpAWCC, awk:SeniorNoteSeriesH655Due2023, us-gaap:SeniorNotes


Repayments
Period End2021-05-10
Value76
Percentage of RepaymentsOfDebt0.0

us-gaap:RepaymentsOfDebt us-gaap:DebtInstrumentRedemptionPeriod

us-gaap:DebtInstrumentRedemptionPeriodOne


Repayments
Period End2021-03-312020-03-312019-03-312018-03-312017-03-312016-03-31
Value256.0126.04.011
Percentage of RepaymentsOfDebt5.00.00.00.00.00.0

us-gaap:RepaymentsOfShortTermDebt dei:LegalEntity, us-gaap:CreditFacility

us-gaap:RepaymentsOfShortTermDebt

awk:AmericanWaterCapitalCorpAWCC, us-gaap:RevolvingCreditFacility


Repayments
Period End2020-09-30
Value0.0
Percentage of RepaymentsOfShortTermDebt0.0

us-gaap:RevenueNotFromContractWithCustomerOther

us-gaap:RevenueNotFromContractWithCustomerOther


Revenue
Period End2021-06-302021-03-312020-09-302020-06-30
Value9.010.05.023
Percentage of RevenueNotFromContractWithCustomerOther100.0100.0100.0100.0

us-gaap:RevenueNotFromContractWithCustomerOther us-gaap:ProductOrService

us-gaap:ServiceOther


Revenue
Period End2020-09-302020-06-30
Value-1.00.0
Percentage of RevenueNotFromContractWithCustomerOther-20.00.0

us-gaap:RevenueNotFromContractWithCustomerOther us-gaap:StatementBusinessSegments

awk:RegulatedBusiness


Revenue
Period End2021-06-302021-03-312020-09-302020-06-30
Value9.010.05.023
Percentage of RevenueNotFromContractWithCustomerOther100.0100.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-09-302019-06-30
Value0.06.00.01.00.00.00.0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability0.0100.00.0100.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value100000.0200000.0200000.0300000.0200000.0100000.0200000.0100000.0100000.00200000.00100000.00400000.0-100000.0100000.0200000.0500000.0121000.0529000.0123000.0427000.0160000.091000.0124000.0562000.0210000.0140000.0226000.0651000.0192000.0388000.078000.0519000.0114000.020000.045000.0304000.086000.057000.08000.040000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock


Stock
Period End2021-03-312020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-100000.0-100000.0-100000.0000-100000.0000-100000.0000-100000.014000.0-1000.0-4000.0-109000.0-7000.00-4000.0-118000.0000-132000.0000-31000.00001000.0-1000.000-7000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation-50.0-33.3-50.00.00.00.0-50.00.00.00.0-25.0-0.00.00.0-20.011.6-0.2-3.3-25.5-4.40.0-3.2-21.00.00.00.0-20.30.00.00.0-6.00.00.00.00.3-1.20.00.0-17.5

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.0-5.09.0173.06.010.03.05.07.09.0-1.04.05.0-3.03.09.010.00.369226.5233.662.0464.901154.2297.8735.6299.1453.757.31124.5599.965.1662.0123.6176.8513.5594.0542.6871.85
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.010.09.017136.010.08.05.07.010.04.04.05.06.07.0-3.03.010.0150.408227.1329.7772.6615.123169.3758.1035.8439.3358.7957.814124.792115.4922.2133.8666.9723.6854.1892.8132.081
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0-200.0100.0100.0433.3100.0100.0266.7100.0100.0111.1-400.0100.0100.00.00.0100.0100.0111.1150.0110.6101.0109.3267.1130.1104.5102.8221.7102.9103.8102.1234.5106.9102.0105.1112.1106.3110.0106.9101.8103.5103.3104.7112.5

us-gaap:TreasuryStock


Stock
Period End2021-03-312020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-15.0-10.0-5.00.00.00.0-5.00.00.00.0-7.01.00.0-1.0-5.00.351-0.042-0.233-6.076-0.2940.0-0.202-4.9770.00.00.0-5.0430.00.00.0-1.0460.00.00.00.019-0.0190.00.0-0.127
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation300.0-333.3-166.70.00.00.0500.00.00.00.00.0-33.30.0-11.1-50.095.1-0.2-3.6-166.0-14.40.0-1.3-117.70.00.00.0-134.50.00.00.0-10.50.00.00.00.3-0.50.00.0-6.9

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization


Utilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value158157153154152145152144142144141141134129114128126124120119115116112111108107105106105
Percentage of UtilitiesOperatingExpenseDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Utilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-30
Value1.05.02.09.01.04.06.03.02.05.05.04.04.03.04.02.03.03.04.04.02.05.03.954.9185.7876.046.2226.046
Percentage of UtilitiesOperatingExpenseDepreciationAndAmortization0.63.21.35.80.72.83.92.11.43.53.52.83.02.33.51.62.42.43.33.41.74.33.54.45.35.75.85.7

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, awk:MarketBasedBusinesses


Utilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-30
Value6.05.06.07.07.06.0119.08.09.09.09.07.04.05.05.04.04.04.04.04.03.03.7592.0431.01.6461.447
Percentage of UtilitiesOperatingExpenseDepreciationAndAmortization3.83.23.94.54.64.17.26.25.66.26.46.45.23.14.43.93.23.23.33.43.52.63.31.80.91.61.4

us-gaap:OperatingSegments, awk:RegulatedBusiness


Utilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-30
Value151147145138144135135132132130127128123122105121119117112111109108104104102979998
Percentage of UtilitiesOperatingExpenseDepreciationAndAmortization95.693.694.889.694.793.188.891.793.090.390.190.891.894.692.194.594.494.493.393.394.893.193.193.793.692.792.892.9

us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations

us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations


Utilities
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
Value431419429419391383412395372365394390348347368324349337373432351348379363336323345341342329333343323312357355327310308345332320428346314305
Percentage of UtilitiesOperatingExpenseMaintenanceAndOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UtilitiesOperatingExpenseTaxes

us-gaap:UtilitiesOperatingExpenseTaxes


Utilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value8083787375777168726967716970676163686365646658606064576056
Percentage of UtilitiesOperatingExpenseTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


Weighted
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-03-312015-09-302015-03-31
Value1000000.01000000.000000001000000.01000000.01000000.01000000.001000000.01000000.01000000.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.00.00.00.00.00.00.00.0100.0100.0100.0100.00.0100.0100.0100.0

awk:AdvancesforConstruction

awk:AdvancesforConstruction


Advancesfor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value274267270262260259240
Percentage of AdvancesforConstruction100.0100.0100.0100.0100.0100.0100.0

awk:BusinessAcquisitionAdditionalGoodwill

awk:BusinessAcquisitionAdditionalGoodwill


Business
Period End2020-09-30
Value5000000.0
Percentage of BusinessAcquisitionAdditionalGoodwill100.0

awk:BusinessAcquisitionAdditionalGoodwill us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:StatementBusinessSegments

awk:BusinessAcquisitions2020, awk:RegulatedWaterAndWastewaterSystems, awk:RegulatedBusiness


Business
Period End2020-12-31
Value5000000.0
Percentage of BusinessAcquisitionAdditionalGoodwill0.0

awk:BusinessCombinationDepositPaid us-gaap:BusinessAcquisition

awk:BusinessCombinationDepositPaid

awk:PennsylvaniaAmericanWaterCompany


Business
Period End2021-04-30
Value20
Percentage of BusinessCombinationDepositPaid100.0

awk:BusinessCombinationDepositPaid us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

awk:PennsylvaniaAmericanWaterCompany, us-gaap:SubsequentEvent


Business
Period End2021-04-30
Value20
Percentage of BusinessCombinationDepositPaid100.0

awk:BusinessCombinationNumberOfCustomersInService us-gaap:BusinessAcquisition

awk:BusinessCombinationNumberOfCustomersInService

awk:NewJerseyAmericanWater


Business
Period End2021-03-29
Value3000.0
Percentage of BusinessCombinationNumberOfCustomersInService100.0

awk:PennsylvaniaAmericanWaterCompany


Business
Period End2021-04-06
Value45000.0
Percentage of BusinessCombinationNumberOfCustomersInService0.0

awk:BusinessCombinationNumberOfCustomersInService us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

awk:PennsylvaniaAmericanWaterCompany, us-gaap:SubsequentEvent


Business
Period End2021-04-06
Value45000.0
Percentage of BusinessCombinationNumberOfCustomersInService0.0

awk:BusinessCombinationNumberOfCustomersInService us-gaap:ProductOrService, us-gaap:BusinessAcquisition

awk:WastewaterServices, awk:NewJerseyAmericanWater


Business
Period End2021-03-29
Value1500.0
Percentage of BusinessCombinationNumberOfCustomersInService50.0

awk:WaterServices, awk:NewJerseyAmericanWater


Business
Period End2021-03-29
Value1500.0
Percentage of BusinessCombinationNumberOfCustomersInService50.0

awk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContributionsInAidOfConstruction

awk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContributionsInAidOfConstruction


Business
Period End2020-09-302013-12-312011-12-31
Value20253.847
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContributionsInAidOfConstruction100.0100.0100.0

awk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContributionsInAidOfConstruction us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType

awk:BusinessAcquisitions2020, awk:RegulatedWaterAndWastewaterSystems


Business
Period End2020-12-31
Value21
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContributionsInAidOfConstruction0.0

awk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebt

awk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebt


Business
Period End2020-09-30
Value6000000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebt100.0

awk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebt us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType

awk:BusinessAcquisitions2020, awk:RegulatedWaterAndWastewaterSystems


Business
Period End2020-12-31
Value7000000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebt0.0

awk:CashCashEquivalentsAndShortTermDebtLiquidity

awk:CashCashEquivalentsAndShortTermDebtLiquidity


Cash
Period End2021-06-302021-03-312020-12-312019-12-31
Value1638112819351448
Percentage of CashCashEquivalentsAndShortTermDebtLiquidity100.0100.0100.0100.0

awk:CommercialPaperAndLineOfCreditFacilityOutstanding

awk:CommercialPaperAndLineOfCreditFacilityOutstanding


Commercial
Period End2021-06-302021-03-312020-12-312019-12-31
Value6821191862862
Percentage of CommercialPaperAndLineOfCreditFacilityOutstanding100.0100.0100.0100.0

awk:CommercialPaperAndLineOfCreditFacilityRemainingBorrowingCapacity

awk:CommercialPaperAndLineOfCreditFacilityRemainingBorrowingCapacity


Commercial
Period End2021-06-302021-03-312020-12-312019-12-31
Value1568105913901388
Percentage of CommercialPaperAndLineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0100.0

awk:CommercialPaperAndLineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility

us-gaap:RevolvingCreditFacility


Commercial
Period End2021-06-302020-12-312019-12-31
Value156813881388
Percentage of CommercialPaperAndLineOfCreditFacilityRemainingBorrowingCapacity100.099.9100.0

awk:CommercialPaperOutstanding

awk:CommercialPaperOutstanding


Commercial
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value6061120786545786
Percentage of CommercialPaperOutstanding100.0100.0100.0100.0100.0

awk:CommercialPaperRemainingBorrowingCapacity

awk:CommercialPaperRemainingBorrowingCapacity


Commercial
Period End2021-06-302021-03-312020-12-312019-12-31
Value149498513141314
Percentage of CommercialPaperRemainingBorrowingCapacity100.0100.0100.0100.0

awk:CommercialPaperWeightedAverageInterestRateEndOfPeriod dei:LegalEntity

awk:CommercialPaperWeightedAverageInterestRateEndOfPeriod

awk:AmericanWaterCapitalCorpAWCC


Commercial
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value0.530.01860.02840.01610.00980.00660.0042
Percentage of CommercialPaperWeightedAverageInterestRateEndOfPeriod100.0100.0100.0100.0100.0100.0100.0

awk:DebtInstrumentUnamortizedDiscountPremiumFairValueNet

awk:DebtInstrumentUnamortizedDiscountPremiumFairValueNet


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value-4.01.07.09.017233135
Percentage of DebtInstrumentUnamortizedDiscountPremiumFairValueNet100.0100.0100.0100.0100.0100.0100.0100.0

awk:DeferredIncomeTaxAssetsInvestmentTaxCredit us-gaap:BalanceSheetLocation

awk:DeferredIncomeTaxAssetsInvestmentTaxCredit

awk:OtherLongtermAssets


Deferred
Period End2020-12-312019-12-31
Value131148
Percentage of DeferredIncomeTaxAssetsInvestmentTaxCredit100.0100.0

us-gaap:OtherCurrentAssets


Deferred
Period End2020-12-312019-12-31
Value3316
Percentage of DeferredIncomeTaxAssetsInvestmentTaxCredit25.210.8

awk:DeferredIncomeTaxLiabilitiesAssetsHeldForSale

awk:DeferredIncomeTaxLiabilitiesAssetsHeldForSale


Deferred
Period End2020-12-312019-12-312018-12-31
Value-69000000.0-67000000.00
Percentage of DeferredIncomeTaxLiabilitiesAssetsHeldForSale100.0100.00.0

awk:DeferredIncomeTaxLiabilitiesNetandInvestmentTaxCredits

awk:DeferredIncomeTaxLiabilitiesNetandInvestmentTaxCredits


Deferred
Period End2020-12-312019-12-312018-12-31
Value211318931740
Percentage of DeferredIncomeTaxLiabilitiesNetandInvestmentTaxCredits100.0100.0100.0

awk:DeferredTaxAssetsAdvancesAndContributions

awk:DeferredTaxAssetsAdvancesAndContributions


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
Value424410402395540513502510485475463
Percentage of DeferredTaxAssetsAdvancesAndContributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits

awk:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value100949196173181
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits100.0100.0100.0100.0100.0100.0

awk:DeferredTaxLiabilitiesDeferredPensionAndOtherPostretirementBenefits

awk:DeferredTaxLiabilitiesDeferredPensionAndOtherPostretirementBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value97777769126139
Percentage of DeferredTaxLiabilitiesDeferredPensionAndOtherPostretirementBenefits100.0100.0100.0100.0100.0100.0

awk:DeferredTaxLiabilitiesandInvestmentTaxCreditsNoncurrent

awk:DeferredTaxLiabilitiesandInvestmentTaxCreditsNoncurrent


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value22552223211320601980192918931904182317691740
Percentage of DeferredTaxLiabilitiesandInvestmentTaxCreditsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:DefinedBenefitPlanRegulatoryAssetsUnderfundedStatus us-gaap:RegulatoryAsset

awk:DefinedBenefitPlanRegulatoryAssetsUnderfundedStatus

us-gaap:PensionCosts


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value36637535227030025824890294243
Percentage of DefinedBenefitPlanRegulatoryAssetsUnderfundedStatus100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:DepositAssetsFairValue

awk:DepositAssetsFairValue


Deposit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value266.04.04.04.04.03.03.03.08.03.03.03.04.04.04.03.04.03.04.06.08.01.01.6664.158
Percentage of DepositAssetsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:DepositAssetsFairValue us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Deposit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value266.04.04.04.04.03.03.03.08.03.03.03.04.04.04.03.04.03.04.06.08.01.01.6664.158
Percentage of DepositAssetsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:DisposalGroupIncludingDiscontinuedOperationCashAccountsReceivableInventoryAssetCurrent us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

awk:DisposalGroupIncludingDiscontinuedOperationCashAccountsReceivableInventoryAssetCurrent

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, awk:NewYorkSubsidiary


Disposal
Period End2021-06-30
Value17
Percentage of DisposalGroupIncludingDiscontinuedOperationCashAccountsReceivableInventoryAssetCurrent100.0

awk:DisposalGroupIncludingDiscontinuedOperationPublicNonUtilitiesPropertyPlantAndEquipment

awk:DisposalGroupIncludingDiscontinuedOperationPublicNonUtilitiesPropertyPlantAndEquipment


Disposal
Period End2020-12-312019-12-312018-12-31
Value5000000.05000000.00
Percentage of DisposalGroupIncludingDiscontinuedOperationPublicNonUtilitiesPropertyPlantAndEquipment100.0100.00.0

awk:DisposalGroupIncludingDiscontinuedOperationPublicUtilitiesPropertyPlantandEquipment us-gaap:PublicUtility

awk:DisposalGroupIncludingDiscontinuedOperationPublicUtilitiesPropertyPlantandEquipment

awk:UtilityPlant


Disposal
Period End2020-12-312019-12-312018-12-31
Value6465870.0
Percentage of DisposalGroupIncludingDiscontinuedOperationPublicUtilitiesPropertyPlantandEquipment100.0100.00.0

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryAssets

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryAssets


Disposal
Period End2021-03-312020-12-312020-09-302012-12-312012-03-312011-12-312011-09-302011-06-302010-12-31
Value7764640.03.69143383735
Percentage of DisposalGroupIncludingDiscontinuedOperationRegulatoryAssets100.0100.0100.00.0100.0100.0100.0100.0100.0

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryAssetsCurrent us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryAssetsCurrent

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, awk:NewYorkSubsidiary


Disposal
Period End2021-06-30
Value77
Percentage of DisposalGroupIncludingDiscontinuedOperationRegulatoryAssetsCurrent100.0

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilities

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilities


Disposal
Period End2021-03-312020-12-312020-09-302012-12-312012-03-312011-12-312011-09-302011-06-302010-12-31
Value4842410.02.1244.6175.6375.7057.622
Percentage of DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilities100.0100.0100.00.0100.0100.0100.0100.0100.0

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilitiesCurrent us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

awk:DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilitiesCurrent

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, awk:NewYorkSubsidiary


Disposal
Period End2021-06-30
Value48
Percentage of DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilitiesCurrent100.0

awk:EstimatedCapitalExpendituresUnderLegalAndBindingContractualObligations

awk:EstimatedCapitalExpendituresUnderLegalAndBindingContractualObligations


Estimated
Period End2020-12-31
Value484
Percentage of EstimatedCapitalExpendituresUnderLegalAndBindingContractualObligations100.0

awk:IntangibleAssetsNoncurrent

awk:IntangibleAssetsNoncurrent


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value505217358616415974788084911019.0
Percentage of IntangibleAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueAfterYearFive

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2021-03-31
Value96
Percentage of LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueAfterYearFive100.0

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueAfterYearFour

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueAfterYearFour


Lessee
Period End2021-06-302020-09-30
Value96101
Percentage of LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueAfterYearFour100.0100.0

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearFive

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2021-03-31
Value7000000.0
Percentage of LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearFive100.0

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearFour

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-31
Value7000000.08000000.0
Percentage of LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearFour100.0100.0

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearOne

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearOne


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1210.01313
Percentage of LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearOne100.0100.0100.0100.0

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearThree

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-31
Value7000000.09000000.0
Percentage of LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearThree100.0100.0

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearTwo

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-31
Value8.012
Percentage of LesseeOperatingAndFinancingLeaseLiabilityPaymentsDueYearTwo100.0100.0

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsRemainderOfFiscalYear

awk:LesseeOperatingAndFinancingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2021-06-30
Value6000000.0
Percentage of LesseeOperatingAndFinancingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsDue

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsDue


Lessee
Period End2020-09-30
Value144
Percentage of LesseeOperatingandFinancingLeaseLiabilityPaymentsDue100.0

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsDueYearFive

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value7000000.0
Percentage of LesseeOperatingandFinancingLeaseLiabilityPaymentsDueYearFive100.0

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsDueafterYearFive

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsDueafterYearFive


Lessee
Period End2020-12-31
Value94
Percentage of LesseeOperatingandFinancingLeaseLiabilityPaymentsDueafterYearFive100.0

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsRemainderofFiscalYear

awk:LesseeOperatingandFinancingLeaseLiabilityPaymentsRemainderofFiscalYear


Lessee
Period End2020-09-30
Value3000000.0
Percentage of LesseeOperatingandFinancingLeaseLiabilityPaymentsRemainderofFiscalYear100.0

awk:LesseeOperatingandFinancingLeaseLiabilityUndiscountedExcessAmount

awk:LesseeOperatingandFinancingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value46474950
Percentage of LesseeOperatingandFinancingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0

awk:LiabilityDefinedBenefitPensionPlanNoncurrentAssetsLiabilitiesHeldForSale us-gaap:RetirementPlanType

awk:LiabilityDefinedBenefitPensionPlanNoncurrentAssetsLiabilitiesHeldForSale

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Liability
Period End2020-12-31
Value-2000000.0
Percentage of LiabilityDefinedBenefitPensionPlanNoncurrentAssetsLiabilitiesHeldForSale100.0

us-gaap:PensionPlansDefinedBenefit


Liability
Period End2020-12-31
Value6000000.0
Percentage of LiabilityDefinedBenefitPensionPlanNoncurrentAssetsLiabilitiesHeldForSale-300.0

awk:LongTermDebtIncludesRedeemablePreferredStockAtRedemptionValue

awk:LongTermDebtIncludesRedeemablePreferredStockAtRedemptionValue


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value103469328933395849593862586448646864875687576757763526403649866815659575357595853586158615874
Percentage of LongTermDebtIncludesRedeemablePreferredStockAtRedemptionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:OperatingandFinancingLeaseLiability

awk:OperatingandFinancingLeaseLiability


Operatingand
Period End2020-09-30
Value94
Percentage of OperatingandFinancingLeaseLiability100.0

awk:OtherInvestmentsFairValueDisclosure

awk:OtherInvestmentsFairValueDisclosure


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-31
Value171611181410.08.0134.05.03.06.03.05.03.04.02.04.01.04.04.04.13522
Percentage of OtherInvestmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:OtherInvestmentsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-31
Value171611181410.08.0134.05.03.06.03.05.03.04.02.04.01.04.04.04.13522
Percentage of OtherInvestmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:PreferredStocksWithMandatoryRedemptionRequirementsCarryingAmount

awk:PreferredStocksWithMandatoryRedemptionRequirementsCarryingAmount


Preferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5.07.08.010.0121212121315151517171717181919192020202022222222
Percentage of PreferredStocksWithMandatoryRedemptionRequirementsCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:PreferredStocksWithMandatoryRedemptionRequirementsCarryingAmount us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value4.04.05.06.06.06.07.07.07.07.08.09.09.09.010.0
Percentage of PreferredStocksWithMandatoryRedemptionRequirementsCarryingAmount0.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

awk:PrepaidPostRetirementAssetsNoncurrent

awk:PrepaidPostRetirementAssetsNoncurrent


Prepaid
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
Value16816755155158158671501681611551930.0
Percentage of PrepaidPostRetirementAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

awk:PublicNonUtilitiesPropertyPlantAndEquipmentPlantForInternalOperations

awk:PublicNonUtilitiesPropertyPlantAndEquipmentPlantForInternalOperations


Public
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value211226718570452405378
Percentage of PublicNonUtilitiesPropertyPlantAndEquipmentPlantForInternalOperations100.0100.0100.0100.0100.0100.0100.0

awk:PublicUtilitiesAllowanceForFundsUsedDuringConstruction dei:LegalEntity, us-gaap:StatementGeographical, us-gaap:RegulatoryAgency

awk:PublicUtilitiesAllowanceForFundsUsedDuringConstruction

awk:CaliforniaAmericanWaterCompany, awk:Monterey, awk:StateWaterResourcesControlBoard


Public
Period End2021-06-302021-03-312020-12-312020-09-30
Value41383633
Percentage of PublicUtilitiesAllowanceForFundsUsedDuringConstruction100.0100.0100.0100.0

awk:PublicUtilitiesApprovedIncreaseInRateGeneralRateCaseForAnnualizedRevenues us-gaap:StatementGeographical

awk:PublicUtilitiesApprovedIncreaseInRateGeneralRateCaseForAnnualizedRevenues

stpr:IA


Public
Period End2021-06-28
Value1000000.0
Percentage of PublicUtilitiesApprovedIncreaseInRateGeneralRateCaseForAnnualizedRevenues100.0

awk:PublicUtilitiesApprovedInfrastructureSurchargeForAnnualizedRevenues us-gaap:StatementGeographical

awk:PublicUtilitiesApprovedInfrastructureSurchargeForAnnualizedRevenues

stpr:TN


Public
Period End2021-01-012020-01-01
Value3000000.02000000.0
Percentage of PublicUtilitiesApprovedInfrastructureSurchargeForAnnualizedRevenues100.0100.0

awk:PublicUtilitiesApprovedInfrastructureSurchargeForAnnualizedRevenues us-gaap:StatementGeographical, us-gaap:SubsequentEventType

stpr:KY, us-gaap:SubsequentEvent


Public
Period End2021-07-01
Value1000000.0
Percentage of PublicUtilitiesApprovedInfrastructureSurchargeForAnnualizedRevenues0.0

awk:PublicUtilitiesRequestedGeneralRateCaseForAnnualizedRevenues us-gaap:StatementGeographical

awk:PublicUtilitiesRequestedGeneralRateCaseForAnnualizedRevenues

stpr:IA


Public
Period End2020-08-28
Value3.0
Percentage of PublicUtilitiesRequestedGeneralRateCaseForAnnualizedRevenues100.0

stpr:WV


Public
Period End2021-04-30
Value32
Percentage of PublicUtilitiesRequestedGeneralRateCaseForAnnualizedRevenues0.0

awk:PublicUtilitiesRequestedInfrastructureSurchargeForAnnualizedRevenues us-gaap:StatementGeographical

awk:PublicUtilitiesRequestedInfrastructureSurchargeForAnnualizedRevenues

stpr:MO


Public
Period End2021-06-28
Value7000000.0
Percentage of PublicUtilitiesRequestedInfrastructureSurchargeForAnnualizedRevenues100.0

stpr:WV


Public
Period End2021-06-30
Value3000000.0
Percentage of PublicUtilitiesRequestedInfrastructureSurchargeForAnnualizedRevenues0.0

awk:PublicUtilityAggregateCosts dei:LegalEntity, us-gaap:StatementGeographical, us-gaap:RegulatoryAgency

awk:PublicUtilityAggregateCosts

awk:CaliforniaAmericanWaterCompany, awk:Monterey, awk:StateWaterResourcesControlBoard


Public
Period End2021-06-302021-03-312020-12-312020-09-30
Value166161154147
Percentage of PublicUtilityAggregateCosts100.0100.0100.0100.0

awk:RabbiTrustInvestments

awk:RabbiTrustInvestments


Rabbi
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2221191816161716151515161515151413131213121212111212110.6660.4250.6820.4440.6960.4580.7190.4810.2410.5010.2580.5180.7791.0311.552
Percentage of RabbiTrustInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:RabbiTrustInvestments us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Rabbi
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value22211918161617161515151615151514131312131212120.00.00.00.00.00.00.0
Percentage of RabbiTrustInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0

awk:RedeemableDebtAmountOutstanding

awk:RedeemableDebtAmountOutstanding


Redeemable
Period End2020-12-31
Value868
Percentage of RedeemableDebtAmountOutstanding100.0

awk:RegulatoryAssetEarnedRevenuePercentage

awk:RegulatoryAssetEarnedRevenuePercentage


Regulatory
Period End2020-12-31
Value50.0
Percentage of RegulatoryAssetEarnedRevenuePercentage100.0

awk:RegulatoryandOtherLongtermLiabilities

awk:RegulatoryandOtherLongtermLiabilities


Regulatoryand
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value4786476147054647458245494517
Percentage of RegulatoryandOtherLongtermLiabilities100.0100.0100.0100.0100.0100.0100.0

awk:RepaymentOfAdvancesForConstruction

awk:RepaymentOfAdvancesForConstruction


Repayment
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2325232321191817191822
Percentage of RepaymentOfAdvancesForConstruction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awk:ShortTermDebtLiquidlyAmount

awk:ShortTermDebtLiquidlyAmount


Short
Period End2020-09-30
Value1630
Percentage of ShortTermDebtLiquidlyAmount100.0

us-gaap:AccrualForEnvironmentalLossContingencies

us-gaap:AccrualForEnvironmentalLossContingencies


Accrual
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value1000000.02000000.04000000.06000000.001000000.01100000.01100000.02200000.02200000.02200000.02200000.03300000.03300000.03300000.04400000.0
Percentage of AccrualForEnvironmentalLossContingencies100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax us-gaap:RetirementPlanType

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-31
Value-168.0-185.0-208.0-32.0
Percentage of AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-31
Value420416409418
Percentage of AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax-250.0-224.9-196.6-1306.2

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivable


Allowance
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value6760524340414142454240393534
Percentage of AllowanceForDoubtfulAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value706760524340411716141819
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure

us-gaap:AssetsFairValueDisclosure


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value997363797063595445515061595850517282685050504653547064424736363939585111812152667485123
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value997363797063595445515056505250514749404948484437385449384231313334504211011347606883122
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.091.884.789.7100.0100.065.359.858.898.096.096.095.771.370.477.176.290.289.486.185.784.886.786.483.692.993.789.090.591.498.098.7

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation


Assets
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312016-12-312015-12-312014-12-312014-09-302013-12-312013-09-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6546296185985795660.00.00.00.06.2567.7618.4857.6460.00.0137929926918917937932
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperation100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302014-09-302013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value6661312196.2567.7610.00.00.0137929943937801796
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, awk:NewYorkSubsidiary


Assets
Period End2021-06-30
Value666
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets


Business
Period End2021-06-302021-03-312020-09-302011-12-31
Value173.08112
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets100.0100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType

awk:BusinessAcquisitions2020, awk:RegulatedWaterAndWastewaterSystems


Business
Period End2020-12-31
Value159
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets0.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities


Business
Period End2020-09-302013-12-312011-12-31
Value27434.945
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities us-gaap:BusinessAcquisition, us-gaap:PropertyPlantAndEquipmentByType

awk:BusinessAcquisitions2020, awk:RegulatedWaterAndWastewaterSystems


Business
Period End2020-12-31
Value29
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities0.0

us-gaap:CapitalizationLongtermDebtAndEquity

us-gaap:CapitalizationLongtermDebtAndEquity


Capitalization
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
Value17036159111578716096159311486814765148361467513500134401343712088118541188312199110431104010977110911101410943109231112010500104361036310476101061002599579824977097129654965395489625960196469547953695659317
Percentage of CapitalizationLongtermDebtAndEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedComputerSoftwareNet us-gaap:PropertyPlantAndEquipmentByType

us-gaap:CapitalizedComputerSoftwareNet

us-gaap:SoftwareDevelopment


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value360345336346345311319303
Percentage of CapitalizedComputerSoftwareNet100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance us-gaap:StatementClassOfStock

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance

awk:DividendReinvestmentAndDirectStockPurchasePlan


Common
Period End2020-12-31
Value4200000.0
Percentage of CommonStockCapitalSharesReservedForFutureIssuance100.0

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerAssetNet


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value585039272617139.07.07.01417151935
Percentage of ContractWithCustomerAssetNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiability


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value444435363734273028232029272925
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:ContractWithCustomerLiabilityNoncurrent


Contract
Period End2020-12-312019-12-312018-12-31
Value270240252
Percentage of ContractWithCustomerLiabilityNoncurrent100.0100.0100.0

us-gaap:ContributionsInAidOfConstruction

us-gaap:ContributionsInAidOfConstruction


Contributions
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
Value14201402139313911383136213551345133713321322131212981287127612641238122512181198118711401121111210981081107410671054104610421015100710029969949889739669519409321016973
Percentage of ContributionsInAidOfConstruction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value9688869276566824632459095474557652095200520352635269527352785.1886965.29181753515339534153465401
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType

awk:AmericanWaterCapitalCorpAWCC, awk:FixedRate, us-gaap:LongTermDebt, awk:PrivateActivityBondsAndGovernmentFundedDebt


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value191191192193194195231
Percentage of DebtInstrumentCarryingAmount2.02.22.52.83.13.34.2

awk:AmericanWaterCapitalCorpAWCC, awk:FixedRate, us-gaap:LongTermDebt, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value8191719161165292478642733753
Percentage of DebtInstrumentCarryingAmount84.582.779.977.575.772.368.6

us-gaap:DebtInstrumentCarryingAmount us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType

srt:Subsidiaries, awk:FixedRate, us-gaap:LongTermDebt, awk:MortgageBonds


Debt
Period End2020-12-312019-12-312018-12-312017-12-31
Value565578606607
Percentage of DebtInstrumentCarryingAmount5.86.67.98.9

srt:Subsidiaries, awk:FixedRate, us-gaap:LongTermDebt, awk:PrivateActivityBondsAndGovernmentFundedDebt


Debt
Period End2020-12-312019-12-312018-12-312017-12-31
Value735724727712
Percentage of DebtInstrumentCarryingAmount7.68.39.510.4

us-gaap:DebtInstrumentCarryingAmount us-gaap:ConsolidatedEntities, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType

srt:Subsidiaries, us-gaap:CollateralizedDebtObligations, awk:PrivateActivityBondsAndGovernmentFundedDebt


Debt
Period End2020-12-312019-12-312018-12-31
Value734723725
Percentage of DebtInstrumentCarryingAmount7.68.39.5

us-gaap:DebtInstrumentCarryingAmount us-gaap:ConsolidatedEntities, us-gaap:FinancialInstrument, us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms

srt:Subsidiaries, us-gaap:LongTermDebt, us-gaap:MandatorilyRedeemablePreferredStock


Debt
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.07.08.010.0
Percentage of DebtInstrumentCarryingAmount0.10.10.10.1

us-gaap:DebtWeightedAverageInterestRate

us-gaap:DebtWeightedAverageInterestRate


Debt
Period End2020-12-31
Value1.85
Percentage of DebtWeightedAverageInterestRate100.0

us-gaap:DebtWeightedAverageInterestRate dei:LegalEntity

awk:AmericanWaterCapitalCorpAWCC


Debt
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value0.130.170.530.01060.01830.0186
Percentage of DebtWeightedAverageInterestRate0.00.028.60.00.00.0

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredFinanceCostsNet


Deferred
Period End2020-12-31
Value15
Percentage of DeferredFinanceCostsNet100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value3226304427112661369432013015
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


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
Value108311261007112311048999901059105810421068
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value65136131256301173197265303331
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


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
Value16515144499012322322138.429
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsRegulatoryAssetsAndLiabilities

us-gaap:DeferredTaxAssetsRegulatoryAssetsAndLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value3293353393270.06.06.3486.2416.432
Percentage of DeferredTaxAssetsRegulatoryAssetsAndLiabilities100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


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
Value21620797103229737169939581
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value291327602537248933392913
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3573683883863974044113993983943903933973903844214224204193423413423423173183173169098103108434435448461375391391411340386392422431
Percentage of DefinedBenefitPensionPlanLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.01.01.040
Percentage of DefinedBenefitPensionPlanLiabilitiesNoncurrent0.30.20.310.4

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value388411390384
Percentage of DefinedBenefitPensionPlanLiabilitiesNoncurrent100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-49000000.0-72000000.0-83000000.0-108000000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-436000000.0-435000000.0-431000000.0-416000000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax889.8604.2519.3385.2

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-217000000.0-257000000.0-291000000.0-140000000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-16000000.0-19000000.0-22000000.02000000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax7.47.47.6-1.4

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value174158154-38.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-396.0-414.0-393.0-385.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet-227.6-262.0-255.21013.2

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value1731591552.0
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.560.03360.04320.03730.0426
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.740.03440.04380.03750.0428
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate107.0102.4101.4100.5100.5

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value3.510.02970.030.03020.0307
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value382374353614610
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value23862161189220341864
Percentage of DefinedBenefitPlanBenefitObligation624.6577.8536.0331.3305.6

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value123131136
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value692657634
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter562.6501.5466.2

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value127113102
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value262728
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value137126120
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive526.9466.7428.6

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value272728
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value135123115
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour500.0455.6410.7

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value272728
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value133118111
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree492.6437.0396.4

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value128115107
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

us-gaap:PensionPlansDefinedBenefit, awk:ToPlanTrust


Defined
Period End2020-12-312019-12-312018-12-31
Value373831
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear


Defined
Period End2021-06-30
Value22
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear100.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-09-30
Value288.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear0.00.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value174158154-38.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-396.0-414.0-393.0-385.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan-227.6-262.0-255.21013.2

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value1990174814991649
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2386216118922034
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value218820181768188817221584161643147212571138
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1990174814991649144313761428171158981861
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount us-gaap:CollectiveBargainingArrangement, us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount

awk:Bargain, awk:LongDurationCorporateAndGovernmentBonds, us-gaap:FairValueInputsLevel1, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value5.04.0
Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount100.0100.0

awk:Bargain, us-gaap:DefinedBenefitPlanCash, us-gaap:FairValueInputsLevel1, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value126.0
Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount240.0150.0

awk:Bargain, us-gaap:DefinedBenefitPlanEquitySecuritiesUsLargeCap, us-gaap:FairValueInputsLevel1, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value1413
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Defined
Period End2020-12-312019-12-31
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount660.0750.0

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Defined
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Defined
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Defined
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Defined
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount160.0150.0

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Defined
Period End2020-12-312019-12-31
Value169137
Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount3380.03425.0

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Defined
Period End2020-12-312019-12-31
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount3800.04425.0

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Defined
Period End2020-12-312019-12-31
Value420358
Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount8400.08950.0

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Defined
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Value124
Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount2480.0

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Defined
Period End2020-12-312019-12-31
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount180.0350.0

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Defined
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Defined
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Defined
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount3260.03950.0

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Defined
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount160.0275.0

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Defined
Period End2020-12-312019-12-31
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount920.01125.0

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Defined
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Defined
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Defined
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount11880.013550.0

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Defined
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount1560.0975.0

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Defined
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Defined
Period End2020-12-312019-12-31
Value420358
Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount8400.08950.0

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Defined
Period End2020-12-31
Value124
Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount2480.0

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Defined
Period End2020-12-312019-12-31
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount180.0350.0

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Defined
Period End2020-12-312019-12-31
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount680.0650.0

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Defined
Period End2020-12-312019-12-31
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount2400.03175.0

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Defined
Period End2020-12-312019-12-31
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Percentage of DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryAmount3420.04225.0

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Derivative
Period End2021-05-06
Value1.58
Percentage of DerivativeAverageFixedInterestRate100.0

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Percentage of DisposalGroupIncludingDiscontinuedOperationAccountsPayableAndAccruedLiabilitiesCurrent100.0

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Period End2020-12-312020-09-30
Value6968
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Period End2021-06-30
Value27
Percentage of DisposalGroupIncludingDiscontinuedOperationGoodwillCurrent100.0

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Percentage of DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets100.0

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Disposal
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Value16
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Disposal
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Value523504491
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Value535
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Fair
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Fair
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Fair
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Finite
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