ANAT


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

Table of contents



us-gaap:CommonStockValue
us-gaap:ConsolidatedEntities
anat:ReorganizationMerger, us-gaap:SubsequentEventType
us-gaap:CommonStockParOrStatedValuePerShare

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:BenefitsLossesAndExpenses
us-gaap:StatementBusinessSegments

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense
us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxesPaidNet

us-gaap:InsuranceCommissionsAndFees
us-gaap:StatementBusinessSegments

us-gaap:InterestCreditedToPolicyholdersAccountBalances
us-gaap:StatementBusinessSegments

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetInvestmentIncome
us-gaap:FinancialInstrument
us-gaap:InvestmentType
us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherIncome
us-gaap:StatementBusinessSegments

us-gaap:PremiumsEarnedNet
us-gaap:StatementBusinessSegments

us-gaap:ProfitLoss

us-gaap:RealizedInvestmentGainsLosses
us-gaap:StatementBusinessSegments

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService

us-gaap:Revenues
us-gaap:StatementBusinessSegments

us-gaap:Assets
us-gaap:ConsolidatedEntities
us-gaap:FairValueByMeasurementFrequency
us-gaap:StatementBusinessSegments

us-gaap:Liabilities
us-gaap:ConsolidatedEntities
us-gaap:FairValueByMeasurementFrequency

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:ConsolidatedEntities
us-gaap:ShortTermInvestments
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

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

us-gaap:OtherAssets
us-gaap:ConsolidatedEntities

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:MinorityInterest
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue
us-gaap:ConsolidatedEntities

us-gaap:AdditionalPaidInCapitalCommonStock
us-gaap:ConsolidatedEntities

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:MinorityInterest
us-gaap:ConsolidatedEntities

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:AwardType
anat:AllocatedShareBasedCompensationExpenseCredit
us-gaap:FinancialInstrument
anat:ChangeInUnrealizedGainsLossesOfInvestmentsAttributableToParticipatingPolicyholdersInterest

anat:ClaimsIncurred
us-gaap:StatementBusinessSegments

anat:CommitmentsExpectedFundingCurrent

anat:DebtSecuritiesHeldToMaturityAllowanceForCreditLossDisposed
us-gaap:FinancialInstrument

anat:EffectiveIncomeTaxRateReconciliationFederalIncomeTaxExpenseBenefitContinuingOperationsBeforeInterestExpense

anat:EffectiveIncomeTaxRateReconciliationOnIncomeBeforeTaxOnEquityInEarningsOfUnconsolidatedAffiliates

anat:EffectiveIncomeTaxRateReconciliationOnTaxOnEquityInEarningsOfUnconsolidatedAffiliates

anat:EffectiveIncomeTaxRateReconciliationTaxCreditLowIncomeHousingExpensePercent
us-gaap:DerivativeInstrumentRisk
anat:FairValueMeasurementWithUnobservableInputsReconciliationLiabilityPremiumsLessBenefitsLosses
us-gaap:DerivativeInstrumentRisk
anat:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesNetChangeIncludedInInterestCredited

anat:FederalIncomeTaxExpenseBenefitContinuingOperationsBeforeInterestExpense

anat:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestBeforeIncomeLossFromEquityMethodInvestments

anat:IncomeTaxReconciliationIncomeTaxExpenseBenefitBeforeTaxOnEquityEarningsOfUnconsolidatedAffiliates

anat:IncomeTaxReconciliationTaxCreditsLowIncomeHousing

anat:IncomeTaxReconciliationTaxOnEquityEarningsOfUnconsolidatedAffiliates

anat:IncreaseDecreaseInCollateralHeldForDerivatives

anat:MortgageLoansOnRealEstateFiledForBankruptcy

anat:MortgageLoansOnRealEstateForeclosuresProcess

anat:MortgageLoansOnRealEstateForeclosuresProcessTotal

anat:NetCapitalizedInterestOnPolicyLoansAndMortgageLoans

anat:OtherComprehensiveIncomeUnrealizedAdjustmentToDacDuringPeriodNetOfTax
us-gaap:StatementEquityComponents

anat:OtherComprehensiveIncomeUnrealizedAdjustmentToDeferredPolicyAcquisitionCostsArisingDuringPeriodTax
us-gaap:StatementEquityComponents

anat:OtherComprehensiveIncomeUnrealizedGainsLossOnSecuritiesInvestmentsAttributableToParticipatingPolicyholdersInterestNetOfTax
us-gaap:StatementEquityComponents

anat:OtherComprehensiveIncomeUnrealizedGainsLossesOnInvestmentsAttributableToParticipatingPolicyholdersInterestArisingDuringPeriodTax
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
anat:ParValueReclassifiedDueToReorganization

anat:PaymentstoAcquireEquityInvestments

anat:PolicyHolderBenefitsAndClaimsIncurredAnnuity

anat:PolicyHolderBenefitsAndClaimsIncurredLife

anat:PolicyholderBenefits
us-gaap:StatementBusinessSegments

anat:ProceedsfromSaleofEquitySecurities
us-gaap:AwardType
anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice

anat:UnamortizedOriginationFees
us-gaap:RelatedPartyTransactionsByRelatedParty
srt:MortgageLoansOnRealEstateInterestRate

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AdditionsToContractHoldersFunds

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
us-gaap:StatementEquityComponents
us-gaap:ConcentrationRiskByType, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:ConcentrationRiskPercentage1
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType
us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType

us-gaap:CurrentFederalTaxExpenseBenefit

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityTransferAmount

us-gaap:DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment
us-gaap:InvestmentType
us-gaap:TransactionType

us-gaap:DeferredFederalIncomeTaxExpenseBenefit

us-gaap:DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss
us-gaap:FinancialInstrument
us-gaap:StatementBusinessSegments

us-gaap:DeferredPolicyAcquisitionCostsAdditions
us-gaap:StatementBusinessSegments

us-gaap:DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease
us-gaap:StatementBusinessSegments

us-gaap:DepreciationNonproduction
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsDividends

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCredits

us-gaap:EffectiveIncomeTaxRateReconciliationTaxExemptIncome

us-gaap:EquityMethodInvestmentDividendsOrDistributions

us-gaap:EquitySecuritiesFvNiGainLoss
us-gaap:FinancialInstrument
us-gaap:StatementBusinessSegments
us-gaap:FinancialInstrument
us-gaap:EquitySecuritiesFvNiRealizedGainLoss
us-gaap:FinancialInstrument
us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

us-gaap:FederalIncomeTaxExpenseBenefitContinuingOperations

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:GuaranteeObligationsLiquidationProceeds

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:InvestmentType

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:IncomeTaxReconciliationDeductionsDividends

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

us-gaap:IncomeTaxReconciliationMinorityInterestIncomeExpense

us-gaap:IncomeTaxReconciliationOtherAdjustments

us-gaap:IncomeTaxReconciliationTaxCredits

us-gaap:IncomeTaxReconciliationTaxExemptIncome

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts
us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInFairValueAdjustmentsOnAssetsAndLiabilitiesCarriedAtFairValueUnderFairValueOption

us-gaap:IncreaseDecreaseInIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInInsuranceLiabilities

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations

us-gaap:IncreaseDecreaseInPremiumsReceivable

us-gaap:IncreaseDecreaseInPrepaidReinsurancePremiums

us-gaap:IncreaseDecreaseInReinsuranceRecoverable

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncurredClaimsPropertyCasualtyAndLiability

us-gaap:InsuranceCommissions
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
us-gaap:StatementBusinessSegments
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
us-gaap:StatementBusinessSegments
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:LongTermPurchaseCommitmentAmount

us-gaap:MortgageLoansOnRealEstateForeclosures

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
us-gaap:StatementEquityComponents
us-gaap:FinancialInstrument
us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
us-gaap:StatementEquityComponents

us-gaap:OtherCostAndExpenseOperating
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromShortTermInvestments

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireHeldToMaturitySecurities

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates

us-gaap:PaymentsToAcquireMortgageNotesReceivable

us-gaap:PaymentsToAcquireOtherInvestments

us-gaap:PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired

us-gaap:PaymentsToAcquireRealEstateHeldForInvestment

us-gaap:PaymentsToFundPolicyLoans

us-gaap:PolicyholderBenefitsAndClaimsIncurredHealthCare

us-gaap:ProceedsFromCollectionOfPolicyLoans

us-gaap:ProceedsFromDistributionsReceivedFromRealEstatePartnerships

us-gaap:ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

us-gaap:ProceedsFromPaymentsToMinorityShareholders

us-gaap:ProceedsFromRepaymentsOfNotesPayable

us-gaap:ProceedsFromSaleAndCollectionOfMortgageNotesReceivable

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ProvisionForLoanAndLeaseLosses

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:IncomeStatementLocation, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionAmountsOfTransaction
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
dei:LegalEntity, us-gaap:StatementGeographical
us-gaap:StatutoryAccountingPracticesPermittedPracticeAmount
us-gaap:StatementBusinessSegments
us-gaap:StatutoryAccountingPracticesStatutoryNetIncomeAmount
us-gaap:StatementBusinessSegments
us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments
us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockRetiredParValueMethodAmount

us-gaap:UnrealizedGainLossOnInvestments
us-gaap:StatementBusinessSegments

us-gaap:WithdrawalFromContractHoldersFunds

anat:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
anat:AdvancesFromFederalHomeLoanBanksFairValueDisclosure

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesAllowanceForCreditLosses

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesCost

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesFairValue

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedGains

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedLosses

anat:DebtSecuritiesHeldToMaturityNetOfAllowanceForCreditLoss

anat:DeferredTaxAssetsTaxDeferredExpenseParticipatingPolicyholdersSurplus

anat:DeferredTaxLiabilitiesPension

anat:FederalHomeLoanBankAdvancesAdditionalBorrowingCapacity
us-gaap:SubsequentEventType

anat:FinancingReceivableDeferredInterestNetCOVID19

anat:FinancingReceivableModifiedCOVID19
us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:SubsequentEventType
anat:FinancingReceivableUnderModificationsCOVID19
us-gaap:SubsequentEventType
anat:FinancingReceivableUnderModificationsNumberOfContractsCOVID19

anat:InsuranceLinesOtherThanShortDuration

anat:InvestmentsExcludingEquityMethodInvestments
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
anat:LiabilitiesRelatedtoInvestmentContractsCarryingAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
anat:LoansGrossInsurancePolicyFairValue
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
anat:LoansReceivableCommercialRealEstatePercentage

anat:MaximumAmountOfInvestmentInLongTermNotesPayable

anat:MortgageLoansOnRealEstateCommercialAndConsumerNetOfAllowanceForCreditLosses

anat:PrepaidPension

anat:RealEstateInvestmentPropertyNetAndRealEstatePartnerships
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
anat:SeparatelyManagedAccounts
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
anat:SeparatelyManagedAccountsMeasurementInput
us-gaap:AwardType
anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfLiabilityComponentOfAward
us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
anat:SignificantUnobservableInputsEquityVolatilityRate
us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
anat:SignificantUnobservableInputsLapseRate

srt:LifeInsuranceInForceAssumed

srt:LifeInsuranceInForceCeded

srt:LifeInsuranceInForceGross

srt:LifeInsuranceInForceNet

srt:LifeInsuranceInForcePercentageAssumedToNet

us-gaap:AccruedInvestmentIncomeReceivable

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

us-gaap:AdditionalCollateralAggregateFairValue
us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors

us-gaap:AdvancesFromFederalHomeLoanBanks
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FairValueByMeasurementBasis

us-gaap:AlternativeInvestment
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsHeldByInsuranceRegulators
us-gaap:BalanceSheetLocation, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:AssetsNet
us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation
us-gaap:ConsolidatedEntities, us-gaap:InvestmentType
us-gaap:InvestmentType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
dei:LegalEntity, us-gaap:StatementScenario, us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:BusinessAcquisitionSharePrice

us-gaap:CollateralAlreadyPostedAggregateFairValue
us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors

us-gaap:ContractualObligation

us-gaap:CreditRiskDerivativeAssetsAtFairValue
us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:FinancialInstrument
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
us-gaap:DebtSecuritiesAvailableForSaleMeasurementInput

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss
us-gaap:FinancialInstrument
us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:DebtSecuritiesHeldToMaturityPastDue

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredPolicyAcquisitionCosts
us-gaap:StatementBusinessSegments

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve

us-gaap:DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost

us-gaap:DeferredTaxLiabilitiesInvestments

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOtherComprehensiveIncome

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanTaxStatus
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:RetirementPlanTaxStatus
us-gaap:RetirementPlanTaxStatus
us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DerivativeAssetFairValueOfCollateral
us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors
us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:MeasurementInputType
us-gaap:DerivativeAssetMeasurementInput
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeAssetNotionalAmount
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeAssets
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeCollateralObligationToReturnCash
us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeLiabilities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeLiabilityNotionalAmount

us-gaap:EquityMethodInvestments
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee, us-gaap:InvestmentType

us-gaap:EquitySecuritiesFvNiCost
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
us-gaap:EquitySecuritiesFvNiMeasurementInput
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
us-gaap:Collateral
us-gaap:FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FederalHomeLoanBankAdvancesInterestRate
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:FinancingReceivableRecordedInvestmentCurrent
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus

us-gaap:FinancingReceivableRecordedInvestmentPastDue
us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:FinancingReceivablesPeriodPastDue

us-gaap:GuaranteeObligationsMaximumExposure

us-gaap:HeldToMaturitySecurities
us-gaap:CreditRatingFitch
us-gaap:CreditRatingFitch, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:FinancialInstrument

us-gaap:IncomeTaxReceivable

us-gaap:LettersOfCreditOutstandingAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LiabilitiesRelatedToInvestmentContractsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments

us-gaap:LiabilityForFuturePolicyBenefitsDisabilityAndAccidentBenefits

us-gaap:LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuitiesAndSupplementaryContracts

us-gaap:LiabilityForFuturePolicyBenefitsLife
us-gaap:ProductOrService
us-gaap:LiabilityForTitleClaimsAndClaimsAdjustmentExpense
us-gaap:TradingActivityByType

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
us-gaap:ProductOrService
us-gaap:StatementBusinessSegments
us-gaap:TradingActivityByType

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseOpeningBalanceAdjustments
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LoansAndLeasesReceivableGrossCarryingAmount

us-gaap:LoansAndLeasesReceivableImpairedCommitmentToLend

us-gaap:LoansInsurancePolicy
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LoansReceivableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
dei:LegalEntity
us-gaap:MembersEquityAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:Ownership, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners

us-gaap:MortgageLoansOnRealEstate
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
us-gaap:StatementGeographical
us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:MortgageLoansOnRealEstateCommercialAndConsumerNet
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:NotesPayable
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType, us-gaap:VariableRate
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:NotesPayableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

us-gaap:NotesReceivableGross
us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:FinancingReceivablesPeriodPastDue

us-gaap:NotesReceivableNet
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:OffBalanceSheetCreditLossLiability

us-gaap:OtherInvestments

us-gaap:OtherLiabilities
us-gaap:ConsolidatedEntities

us-gaap:OtherPolicyholderFunds
us-gaap:ConsolidatedEntities
us-gaap:OtherReceivables

us-gaap:OtherShortTermInvestments

us-gaap:ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent

us-gaap:PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged

us-gaap:PolicyholderContractDeposits

us-gaap:PremiumsAndOtherReceivablesNet
us-gaap:ConsolidatedEntities

us-gaap:PrepaidReinsurancePremiums

us-gaap:RealEstateHeldforsale

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation

us-gaap:RealEstateInvestmentPropertyNet
us-gaap:ConsolidatedEntities
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType
us-gaap:RealEstateInvestments
us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType
us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType
us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType

us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
us-gaap:ProductOrService
us-gaap:TradingActivityByType

us-gaap:ReinsuranceRecoverables
us-gaap:StatementBusinessSegments

us-gaap:ReinsuranceRecoverablesAllowance

us-gaap:ReinsuranceRecoverablesOnPaidAndUnpaidLosses
us-gaap:BalanceSheetLocation, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionDueFromToRelatedParty

us-gaap:SeparateAccountAssets
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

us-gaap:SeparateAccountsLiability
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsCumulativePaidClaimsAndAllocatedClaimAdjustmentExpenseNet
us-gaap:ProductOrService, us-gaap:ShortdurationInsuranceContractsAccidentYear
us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:TradingActivityByType
us-gaap:TradingActivityByType
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearEight
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFive
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFour
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearNine
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearOne
us-gaap:TradingActivityByType
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSeven
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSix
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTen
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearThree
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTwo
us-gaap:TradingActivityByType
us-gaap:ProductOrService, us-gaap:ShortdurationInsuranceContractsAccidentYear
us-gaap:ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet
us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:TradingActivityByType
us-gaap:ProductOrService
us-gaap:ShortdurationInsuranceContractsIncurredClaimsAndAllocatedClaimAdjustmentExpenseNet
us-gaap:ProductOrService, us-gaap:ShortdurationInsuranceContractsAccidentYear
us-gaap:ShortdurationInsuranceContractsAccidentYear, us-gaap:TradingActivityByType
us-gaap:TradingActivityByType

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimAdjustmentExpenseAggregateReconcilingItems

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAccumulatedUnallocatedClaimAdjustmentExpense
us-gaap:StatementScenario
us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
us-gaap:ConsolidatedEntities
us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
us-gaap:StatementBusinessSegments

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InformationByCategoryOfDebtSecurity, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InformationByCategoryOfDebtSecurity, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InformationByCategoryOfDebtSecurity, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationUnearnedPremiums
us-gaap:StatementBusinessSegments

us-gaap:TaxesPayableCurrentAndNoncurrent

us-gaap:UnearnedPremiums
us-gaap:BalanceSheetLocation, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount
us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation
us-gaap:ConsolidatedEntities, us-gaap:InvestmentType
us-gaap:InvestmentType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Balance Sheet
Cash And Cash Equivalents At Carrying Value
Assets
Property Plant And Equipment Net
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Other Liabilities
Stockholders Equity
Common Stock Value
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:CommonStockValue ▁▁▁▁█0.2690.2690.2690.26930.832NA30.832NANA
 us-gaap:CommonStockParOrStatedValuePerShare anat:ReorganizationMerger,us-gaap:SubsequentEventType anat:ANGStock,us-gaap:SubsequentEventNANANANANANANANANA
 us-gaap:CommonStockParOrStatedValuePerShare anat:ReorganizationMerger,us-gaap:SubsequentEventType anat:ANICOStock,us-gaap:SubsequentEventNANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█26.88472226.884899NA26.88475826.88712926.891675NA26.88817226.888964
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▄▄26.877226.8772NA26.877226.87868426.8817NA26.881726.8817
us-gaap:EarningsPerShareBasic ▇▆█▆▇▁▆▅▅8.486.3311.396.367.83-8.26.3699999999999973.433.68
us-gaap:EarningsPerShareDiluted ▇▆█▆▇▁▆▅▅8.486.3311.3899999999999996.367.83-8.26.3599999999999993.433.67
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
 EBT Margin us-gaap:StatementBusinessSegments anat:AccidentAndHealthSegment▁▃▆▆█▇█▆█42.38244.40548.59447.93850.66249.84650.56648.07850.134
 EBT Margin us-gaap:StatementBusinessSegments anat:AnnuitySegment▇▆▇▇█▁▇▇█191.781183.992203.328195.845220.14261.753190.978187.98216.687
 EBT Margin us-gaap:StatementBusinessSegments anat:LifeSegment█▇█▆▆▁▅▄▂256.958250.542255.395246.092241.981211.367238.082227.927221.082
 EBT Margin us-gaap:StatementBusinessSegments anat:PropertyAndCasualtySegment█▆█▅▁▄▄▃▁427.997418.407426.456410.516391.585408.475404.883402.278391.275
 EBT Margin us-gaap:StatementBusinessSegments us-gaap:CorporateAndOther█▇█▇█▁▇▆▆251.576141.272257.647169.715256.818-346.049172.76466.23777.499
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:BenefitsLossesAndExpenses █▆▆██▁▆▇▇885.249826.118828.953872.063884.958668.228835.864848.134852.773
us-gaap:ComprehensiveIncomeNetOfTax ▇▅▇▆█▁▆▅▆279.86867.962333.816201.847386.509-332.015185.19690.776199.441
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▁▂▂▂▂▁▁█▁0.0570.10.2870.6510.223-0.153-0.0313.759-0.965
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▇▅▇▆█▁▆▅▆279.92568.062334.103202.498386.732-332.168185.166104.535198.476
us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense ▃▂█▁133.518128.053159.266125.272NANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▇▆█▆▇▁▆▅▅285.445212.5362.467198.043276.23-282.836221.40984.366103.904
us-gaap:IncomeTaxesPaidNet █▁▄▄55.2260.01820.027.0NANA27.518.5NA
us-gaap:InsuranceCommissionsAndFees █▆▁▄▄▄▄▃▂90.52386.53972.0179.34479.78779.60579.07876.78475.146
us-gaap:InterestCreditedToPolicyholdersAccountBalances ▆▆▃▇█▁█▆▇111.236107.78749.636128.946146.783-4.323140.296106.782123.687
us-gaap:InterestPaidNet ▃▅▆█▃▁0.1330.2180.2930.380.1110.021NANANA
us-gaap:NetIncomeLoss ▇▆█▆▇▁▆▅▅227.976170.173306.352171.052210.545-220.444171.12292.18498.84
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▁▂▂▂▂▁▁█▁0.0570.10.2870.6510.223-0.153-0.0313.759-0.965
us-gaap:NetInvestmentIncome █▇▇▆█▁▇▆▆297.399269.981276.797254.256287.348130.991280.71246.62257.73
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▆▆▇▆▆▁▅▄█0.1750.2440.4490.3710.339-0.9240.093-0.2930.746
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▁▄▄█▁▄▄▆51.892-102.21127.46430.795175.964-111.57114.074-1.408100.601
us-gaap:OtherIncome ▂▁▁▁▂▂█▂▂11.0359.7529.4049.68310.33611.13318.75910.7310.374
us-gaap:PremiumsEarnedNet ▅▅█▅▁▂▁▄▄565.252562.653586.579561.464533.263536.768532.441557.844556.272
us-gaap:ProfitLoss ▇▆█▆▇▁▆▅▅228.033170.273306.639171.703210.768-220.597171.092105.94397.875
us-gaap:RealizedInvestmentGainsLosses ▁█10.60219.239NA17.3873.9394.148NA31.933-9.905
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ██▃██▅▁▇▇1170.6941038.618-382.9051070.1061161.188385.392-830.076932.5956.677
us-gaap:Revenues █▇█▇█▁▇▆▆1170.6941038.6181191.421070.1061161.188385.3921057.273932.5956.677
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:Assets █▅▃▃▁30378.70829849.82129467.81529448.74428994.963NA28597.566NANA
us-gaap:Liabilities █▅▁▄▁23609.6723338.34223002.24823295.9323022.022NA22601.803NANA
us-gaap:LiabilitiesAndStockholdersEquity █▅▃▃▁30378.70829849.82129467.81529448.74428994.963NA28597.566NANA
us-gaap:StockholdersEquity █▆▅▃▁6762.0446504.2036458.276146.5075966.686NA5989.749NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▃▁█▃427.149459.087339.947884.083466.247NA452.001NANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▂▃▁█▃▁▃▃▁427.149459.087339.947884.083466.247328.752452.001436.307312.835
 us-gaap:ShortTermInvestments us-gaap:ConsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiary▁▁▁▁█0.50.50.50.50.501NA0.5NANA
 us-gaap:ShortTermInvestments us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurring▅█▆▄▁917.5811212.3421028.379800.793501.087NA425.321NANA
 us-gaap:ShortTermInvestments us-gaap:FairValueByMeasurementBasis us-gaap:CarryingReportedAmountFairValueDisclosure▅█▆▄▁917.5811212.3421028.379800.793501.087NA425.321NANA
 us-gaap:ShortTermInvestments us-gaap:FairValueByMeasurementBasis us-gaap:EstimateOfFairValueFairValueDisclosure▅█▆▄▁917.5811212.3421028.379800.793501.087NA425.321NANA
 us-gaap:ShortTermInvestments us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueMeasurementsRecurring▅█▆▄▁917.5811212.3421028.379800.793501.087NA425.321NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment █▆▅▃▁292.969287.615281.738276.047269.977NA257.907NANA
us-gaap:PropertyPlantAndEquipmentNet █▇▅▄▁129.141125.81121.578117.892110.313NA106.303NANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities srt:ParentCompanyNANA6453.754NANANA3855.531NANA
us-gaap:EquitySecuritiesFvNi █▆▅▂▁2340.5082164.1462070.7661840.8551714.264NA1700.96NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:DeferredIncomeTaxLiabilitiesNet █▆▆▃▁528.779478.469478.347414.206382.753NA394.528NANA
us-gaap:MinorityInterest ▆██▁▁6.9947.2767.2976.3076.255NA6.014NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:StockholdersEquity █▆▅▃▁6762.0446504.2036458.276146.5075966.686NA5989.749NANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest █▆▆▄▃▁▃▂▂6769.0386511.4796465.5676152.8145972.9415607.0895995.7635831.7085767.582
us-gaap:CommonStockValue ▁▁▁▁█0.2690.2690.2690.26930.832NA30.832NANA
us-gaap:AdditionalPaidInCapitalCommonStock ████▁47.72247.70247.68347.68921.051NA21.011NANA
us-gaap:RetainedEarningsAccumulatedDeficit █▆▄▁▁6542.2026336.2736188.1485903.8435859.361NA5946.857NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▅▁█▆▄171.851119.959222.17194.706163.911NA99.518NANA
us-gaap:MinorityInterest ▆██▁▁6.9947.2767.2976.3076.255NA6.014NANA
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders ▁█0.3390.38NA0.5990.3620.323NA18.4351.957
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▇▅▇▂▆▆█-11.236149.43681.42134.6954.297112.051111.216163.424NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▃▁█▂▂▅▅-138.435-133.902-318.012334.118-266.177-195.25270.05580.109NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▁▄█▄▂▃117.733103.606-307.544-50.977399.375-40.048-165.577-120.061NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▅▆▁█▆▄▅▆-31.938119.14-544.136417.836137.495-123.24915.694123.472NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▆▄█▁█▄▃▃48.279-1.31382.924-57.38178.18-3.447-18.785-17.752NA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▇▅▇▂▆▆█-11.236149.43681.42134.6954.297112.051111.216163.424NA
us-gaap:NetIncomeLoss ▇▆█▆▇▁▆▅▅227.976170.173306.352171.052210.545-220.444171.12292.18498.84
us-gaap:ProfitLoss ▇▆█▆▇▁▆▅▅228.033170.273306.639171.703210.768-220.597171.092105.94397.875
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▃▁█▂▂▅▅-138.435-133.902-318.012334.118-266.177-195.25270.05580.109NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▄▅▅█▆▁▁▂8.9449.91410.06413.64810.7975.3545.3086.6NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▁▄█▄▂▃117.733103.606-307.544-50.977399.375-40.048-165.577-120.061NA
us-gaap:PaymentsOfDividendsCommonStock ▃▄█▁▃▃▄█22.04722.04822.0522.04622.04722.04722.04822.05NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.2690.2690.2690.2693030
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.10.1

us-gaap:CommonStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Common
Period End2020-12-312019-12-31
Value0.26930
Percentage of CommonStockValue100.0100.0
Percentage of Assets0.00.1
Percentage of Assets srt:ParentCompany0.00.1

Common Stock Par Or Stated Value Per Share

us-gaap:CommonStockParOrStatedValuePerShare anat:ReorganizationMerger, us-gaap:SubsequentEventType

us-gaap:CommonStockParOrStatedValuePerShare

anat:ANGStock, us-gaap:SubsequentEvent


Common
Period End2020-07-01
Value0.01
Percentage of CommonStockParOrStatedValuePerShare100.0

anat:ANICOStock, us-gaap:SubsequentEvent


Common
Period End2020-07-01
Value1.0
Percentage of CommonStockParOrStatedValuePerShare10000.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value26262626262626
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value26262626262626
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value8.486.3311.396.367.83-8.26.373.433.68
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value8.486.3311.396.367.83-8.26.363.433.67
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0

Benefits Losses And Expenses

us-gaap:BenefitsLossesAndExpenses

us-gaap:BenefitsLossesAndExpenses


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value885826828872884668835848852
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax75.679.50.081.576.2173.40.091.089.1

us-gaap:BenefitsLossesAndExpenses us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value444143454353474545
Percentage of BenefitsLossesAndExpenses5.05.05.25.24.98.05.75.45.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.84.00.04.23.713.90.04.94.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AccidentAndHealthSegment0.00.00.00.00.00.00.00.00.0

anat:AnnuitySegment


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value16115616018720261174177213
Percentage of BenefitsLossesAndExpenses18.319.019.321.522.99.220.920.925.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.815.10.017.517.416.00.019.022.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AnnuitySegment0.00.00.00.00.00.00.00.00.0

anat:LifeSegment


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value245243243250224187227219198
Percentage of BenefitsLossesAndExpenses27.729.529.428.725.428.127.225.923.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.923.50.023.419.348.70.023.520.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:LifeSegment0.00.00.00.00.00.00.00.00.0

anat:PropertyAndCasualtySegment


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value407373369378405354373396386
Percentage of BenefitsLossesAndExpenses46.045.344.643.445.853.044.746.745.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.836.00.035.434.991.90.042.540.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:PropertyAndCasualtySegment0.00.00.00.00.00.00.00.00.0

us-gaap:CorporateAndOther


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value279.78611109.3710139.759.127
Percentage of BenefitsLossesAndExpenses3.11.21.41.21.11.61.61.11.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.30.90.01.00.82.80.01.01.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value27967333201386-332.01518590199
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.96.50.018.933.3-86.10.09.720.8

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.0570.10.2870.6510.223-0.153-0.0313-0.965
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.10.0-0.00.01.5-0.1

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value27968334202386-332.168185104198
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.96.60.018.933.3-86.20.011.220.7

Deferred Policy Acquisition Cost Amortization Expense

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value133128159125
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.412.30.011.7

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value4.5663.7034.0843.992
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense3.42.92.63.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.40.00.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AccidentAndHealthSegment0.00.00.00.0

anat:AnnuitySegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value18123823
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense14.19.724.118.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.20.02.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AnnuitySegment0.00.00.00.0

anat:LifeSegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value23282918
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense17.922.518.215.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.02.80.01.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:LifeSegment0.00.00.00.0

anat:PropertyAndCasualtySegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value86838778
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense64.664.955.162.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.48.00.07.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:PropertyAndCasualtySegment0.00.00.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value285212362198276-282.83622184103
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.420.50.018.523.8-73.40.09.010.9

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-1.7712.7065.2042.9267.317-3.6693.2112.3444.173
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments-0.61.31.41.52.61.31.52.84.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.20.30.00.30.6-1.00.00.30.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AccidentAndHealthSegment0.00.00.00.00.00.00.00.00.0

anat:AnnuitySegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2927438.20817-0.03916103.29
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments10.512.811.94.16.50.07.412.93.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.62.60.00.81.5-0.00.01.20.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AnnuitySegment0.00.00.00.00.00.00.00.00.0

anat:LifeSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value116.6211-3.9421723108.41423
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments4.23.13.2-2.06.4-8.44.910.022.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.00.60.0-0.41.56.10.00.92.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:LifeSegment0.00.00.00.00.00.00.00.00.0

anat:PropertyAndCasualtySegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value20445631-13.98554316.2154.991
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments7.321.015.716.0-5.1-19.114.17.44.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.84.30.03.0-1.214.10.00.70.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:PropertyAndCasualtySegment0.00.00.00.00.00.00.00.00.0

us-gaap:CorporateAndOther


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value224131245159247-356.9861595668
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments78.661.967.880.389.6126.272.167.065.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.212.70.014.921.3-92.60.06.17.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value550.01820272718
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.70.00.02.50.02.0

Insurance Commissions And Fees

us-gaap:InsuranceCommissionsAndFees

us-gaap:InsuranceCommissionsAndFees


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value908672797979797675
Percentage of InsuranceCommissionsAndFees100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.78.30.07.46.920.70.08.27.9

us-gaap:InsuranceCommissionsAndFees us-gaap:StatementBusinessSegments

anat:AnnuitySegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value6.9965.0313.834.0273.5614.0654.3174.3384.536
Percentage of InsuranceCommissionsAndFees7.75.85.35.14.55.15.55.66.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.50.00.40.31.10.00.50.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AnnuitySegment0.00.00.00.00.00.00.00.00.0

anat:LifeSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value838168757675747270
Percentage of InsuranceCommissionsAndFees92.394.294.794.995.594.994.594.494.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.17.80.07.06.619.60.07.87.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:LifeSegment0.00.00.00.00.00.00.00.00.0

Interest Credited To Policyholders Account Balances

us-gaap:InterestCreditedToPolicyholdersAccountBalances

us-gaap:InterestCreditedToPolicyholdersAccountBalances


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value11110749128146-4.323140106123
Percentage of InterestCreditedToPolicyholdersAccountBalances100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.510.40.012.012.6-1.10.011.512.9

us-gaap:InterestCreditedToPolicyholdersAccountBalances us-gaap:StatementBusinessSegments

anat:AnnuitySegment


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value878821104121-2.4211684108
Percentage of InterestCreditedToPolicyholdersAccountBalances79.081.743.381.082.856.083.379.487.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.58.50.09.810.5-0.60.09.111.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AnnuitySegment0.00.00.00.00.00.00.00.00.0

anat:LifeSegment


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2319282425-1.903232215
Percentage of InterestCreditedToPolicyholdersAccountBalances21.018.356.719.017.244.016.720.612.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.01.90.02.32.2-0.50.02.41.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:LifeSegment0.00.00.00.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value133000.0218000.0293000.0380000.0111000.021000.0
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value227170306171210-220.4441719298258
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.516.40.016.018.1-57.20.09.910.30.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value227170171210-220.4449298258
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.516.416.018.1-57.29.910.30.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.0570.10.2870.6510.223-0.153-0.0313-0.965
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.10.0-0.00.01.5-0.1

Net Investment Income

us-gaap:NetInvestmentIncome

us-gaap:NetInvestmentIncome


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value297269276254287130280246257
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.426.00.023.824.734.00.026.426.9

us-gaap:NetInvestmentIncome us-gaap:FinancialInstrument

us-gaap:Option


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4028543867-108.095496.27823
Percentage of NetInvestmentIncome13.510.719.615.223.4-82.517.52.59.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.42.80.03.65.8-28.00.00.72.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Option0.00.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:InvestmentType

anat:DividendsOnEquitySecurities


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value8.3077.4937.9057.9197.8477.9859.015
Percentage of NetInvestmentIncome2.82.83.12.86.03.23.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.70.70.72.00.90.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:DividendsOnEquitySecurities0.00.00.00.00.00.00.0

anat:OtherInvestedAssets


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value7.8367.4578.2747.438.3318.3728.991127.017
Percentage of NetInvestmentIncome2.62.83.02.92.96.43.25.02.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.70.00.70.72.20.01.30.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:OtherInvestedAssets0.00.00.00.00.00.00.00.00.0

srt:PartnershipInterest


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value1721-14.674.933
Percentage of NetInvestmentIncome5.97.9-5.13.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.52.1-1.31.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:PartnershipInterest0.00.00.00.0

us-gaap:DebtSecurities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value129130134138141146149154150
Percentage of NetInvestmentIncome43.648.348.554.649.3111.553.262.658.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.112.60.013.012.237.90.016.515.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DebtSecurities0.00.00.00.00.00.00.00.00.0

us-gaap:Mortgages


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value687070616059636463
Percentage of NetInvestmentIncome23.026.225.324.221.045.322.726.324.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.86.80.05.85.215.40.06.96.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Mortgages0.00.00.00.00.00.00.00.00.0

us-gaap:RealEstateInvestment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value253.4852.471-0.1211.734121.5391.0054.508
Percentage of NetInvestmentIncome8.61.30.9-0.00.69.50.50.41.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.20.30.0-0.00.13.20.00.10.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RealEstateInvestment0.00.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2.0042.0832.1572.0332.2142.2332.292.3812.376
Percentage of NetInvestmentIncome0.70.80.80.80.81.70.81.00.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.00.20.20.60.00.30.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AccidentAndHealthSegment0.00.00.00.00.00.00.00.00.0

anat:AnnuitySegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value16315317516318941176141155
Percentage of NetInvestmentIncome54.957.063.464.266.131.762.757.560.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.014.80.015.216.310.80.015.216.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AnnuitySegment0.00.00.00.00.00.00.00.00.0

anat:LifeSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value726772697345696163
Percentage of NetInvestmentIncome24.325.126.327.225.634.824.625.124.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.26.50.06.56.311.80.06.66.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:LifeSegment0.00.00.00.00.00.00.00.00.0

anat:PropertyAndCasualtySegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value151515161616161616
Percentage of NetInvestmentIncome5.35.75.76.35.612.35.86.66.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.50.01.51.44.20.01.81.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:PropertyAndCasualtySegment0.00.00.00.00.00.00.00.00.0

us-gaap:CorporateAndOther


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4430103.8145.6125162419
Percentage of NetInvestmentIncome14.811.43.81.52.019.56.09.87.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.83.00.00.40.56.60.02.62.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value175000.0244000.0449000.0371000.0339000.0-924000.093000.0-293000.0746000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.0-0.20.0-0.00.1

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-12-312020-09-302019-12-312019-09-30
Value449000.0371000.093000.0-293000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value175000.0244000.0449000.0371000.0339000.0-924000.093000.0-293000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.0-0.20.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value51-102.2112730175-111.57114-1.40810086
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.4-9.80.02.915.2-29.00.0-0.210.50.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value51-102.21130175-111.571-1.40810086
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.4-9.82.915.2-29.0-0.210.50.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.0

Other Income

us-gaap:OtherIncome

us-gaap:OtherIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value119.7529.4049.6831011181010
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.90.00.90.92.90.01.21.1

us-gaap:OtherIncome us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value5.8934.0944.5974.9715.5034.5274.8225.0215.534
Percentage of OtherIncome53.442.048.951.353.240.725.746.853.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.40.00.50.51.20.00.50.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AccidentAndHealthSegment0.00.00.00.00.00.00.00.00.0

anat:AnnuitySegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.9320.8560.550.7330.7950.6380.8110.6530.574
Percentage of OtherIncome8.48.85.87.67.75.74.36.15.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.00.10.10.20.00.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AnnuitySegment0.00.00.00.00.00.00.00.00.0

anat:LifeSegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.4220.4580.550.3580.440.7360.3810.4410.469
Percentage of OtherIncome3.84.75.83.74.36.62.04.14.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.20.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:LifeSegment0.00.00.00.00.00.00.00.00.0

anat:PropertyAndCasualtySegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2.7863.4893.1233.0792.8443.7333.2083.1372.83
Percentage of OtherIncome25.235.833.231.827.533.517.129.227.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.30.00.30.21.00.00.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:PropertyAndCasualtySegment0.00.00.00.00.00.00.00.00.0

us-gaap:CorporateAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1.0020.8550.5840.5420.7541.4999.5371.4780.967
Percentage of OtherIncome9.18.86.25.67.313.550.813.89.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.00.10.10.40.00.20.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet

us-gaap:PremiumsEarnedNet


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value565562586561533536532557556
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.354.20.052.545.9139.30.059.858.1

us-gaap:PremiumsEarnedNet us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Premiums
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value34384042434042
Percentage of PremiumsEarnedNet6.16.87.38.18.07.37.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.93.73.83.711.24.44.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AccidentAndHealthSegment0.00.00.00.00.00.00.0

anat:AnnuitySegment


Premiums
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value20242725154156
Percentage of PremiumsEarnedNet3.64.35.04.92.97.410.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.82.32.62.24.04.45.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AnnuitySegment0.00.00.00.00.00.00.0

anat:LifeSegment


Premiums
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value10010010191899386
Percentage of PremiumsEarnedNet17.817.918.017.216.716.715.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.69.79.57.923.210.09.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:LifeSegment0.00.00.00.00.00.00.0

anat:PropertyAndCasualtySegment


Premiums
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value409399391372388382371
Percentage of PremiumsEarnedNet72.471.069.769.972.468.666.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.038.536.632.1100.841.038.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:PropertyAndCasualtySegment0.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value228170306171210-220.59717110597
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.516.40.016.018.2-57.20.011.410.2

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RealizedInvestmentGainsLosses


Realized
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value1019173.9394.14831-9.905
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.91.60.31.13.4-1.0

us-gaap:RealizedInvestmentGainsLosses us-gaap:StatementBusinessSegments

us-gaap:CorporateAndOther


Realized
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value1019173.9394.14831-9.905
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.91.60.31.13.4-1.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateAndOther0.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value11701038-382.90510701161385-830.076932956
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

us-gaap:FixedAnnuity


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2024232725159.7054156
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.82.3-6.12.62.24.0-1.24.45.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.82.3-6.12.62.24.0-1.24.45.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:FixedAnnuity100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:HealthInsuranceProductLine


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value343841404243434042
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.93.7-10.93.83.711.2-5.24.44.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.93.7-10.93.83.711.2-5.24.44.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:HealthInsuranceProductLine100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LifeInsuranceSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1001001131019189939386
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.69.7-29.79.57.923.2-11.310.09.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.69.7-29.79.57.923.2-11.310.09.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:LifeInsuranceSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value409399407391372388385382371
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.038.5-106.436.632.1100.8-46.441.038.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.038.5-106.436.632.1100.8-46.441.038.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:PropertyAndCasualtyCommercialInsuranceProductLine100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value117010381191107011613851057932956
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0-311.2100.0100.0100.0-127.4100.0100.0

us-gaap:Revenues us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value424448475049504850
Percentage of Revenues3.64.34.14.54.412.94.85.25.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.64.3-12.74.54.412.9-6.15.25.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AccidentAndHealthSegment0.00.00.00.00.00.00.00.00.0

anat:AnnuitySegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value19118320319522061190187216
Percentage of Revenues16.417.717.118.319.016.018.120.222.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.417.7-53.118.319.016.0-23.020.222.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:AnnuitySegment0.00.00.00.00.00.00.00.00.0

anat:LifeSegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value256250255246241211238227221
Percentage of Revenues21.924.121.423.020.854.822.524.423.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.924.1-66.723.020.854.8-28.724.423.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:LifeSegment0.00.00.00.00.00.00.00.00.0

anat:PropertyAndCasualtySegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value427418426410391408404402391
Percentage of Revenues36.640.335.838.433.7106.038.343.140.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.640.3-111.438.433.7106.0-48.843.140.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax anat:PropertyAndCasualtySegment0.00.00.00.00.00.00.00.00.0

us-gaap:CorporateAndOther


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value251141257169256-346.0491726677
Percentage of Revenues21.513.621.615.922.1-89.816.37.18.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.513.6-67.315.922.1-89.8-20.87.18.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value303782984929467294482899428597
Percentage of Assets100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-31
Value647123077
Percentage of Assets22.080.7
Percentage of Assets22.080.7
Percentage of Assets srt:ParentCompany100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value151155157156156165
Percentage of Assets0.50.50.50.50.50.6
Percentage of Assets0.50.50.50.50.50.6
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value128681298612970132531379214107
Percentage of Assets42.443.544.045.047.649.3
Percentage of Assets42.443.544.045.047.649.3
Percentage of Assets us-gaap:FairValueMeasurementsNonrecurring100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Assetsus-gaap:
Period End2020-12-312019-12-31
Value515511
Percentage of Assets1.81.8
Percentage of Assets1.81.8
Percentage of Assets anat:AccidentAndHealthSegment100.0100.0

anat:AnnuitySegment


Assetsus-gaap:
Period End2020-12-312019-12-31
Value1364213808
Percentage of Assets46.348.3
Percentage of Assets46.348.3
Percentage of Assets anat:AnnuitySegment100.0100.0

anat:LifeSegment


Assetsus-gaap:
Period End2020-12-312019-12-31
Value71116825
Percentage of Assets24.123.9
Percentage of Assets24.123.9
Percentage of Assets anat:LifeSegment100.0100.0

anat:PropertyAndCasualtySegment


Assetsus-gaap:
Period End2020-12-312019-12-31
Value27162570
Percentage of Assets9.29.0
Percentage of Assets9.29.0
Percentage of Assets anat:PropertyAndCasualtySegment100.0100.0

us-gaap:CorporateAndOther


Assetsus-gaap:
Period End2020-12-312019-12-31
Value54804881
Percentage of Assets18.617.1
Percentage of Assets18.617.1
Percentage of Assets us-gaap:CorporateAndOther100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value236092333823002232952302222601
Percentage of Liabilities100.0100.0100.0100.0100.0100.0
Percentage of Assets77.778.278.179.179.479.0

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value1317088
Percentage of Liabilities0.175.6
Percentage of Assets0.059.8
Percentage of Assets srt:ParentCompany0.274.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value156161162161160167
Percentage of Liabilities0.70.70.70.70.70.7
Percentage of Assets0.50.50.60.50.60.6
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary103.4103.8103.1103.3102.5101.5

us-gaap:Liabilities us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value107051063710505108211084010412
Percentage of Liabilities45.345.645.746.547.146.1
Percentage of Assets35.235.635.736.737.436.4
Percentage of Assets us-gaap:FairValueMeasurementsNonrecurring83.281.981.081.778.673.8

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value303782984929467294482899428597
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-31
Value647123077
Percentage of LiabilitiesAndStockholdersEquity22.080.7
Percentage of Assets22.080.7
Percentage of Assets srt:ParentCompany100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value676265046458614659665989
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0
Percentage of Assets22.321.821.920.920.620.9

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-31
Value64585989
Percentage of StockholdersEquity100.0100.0
Percentage of Assets21.920.9
Percentage of Assets srt:ParentCompany99.826.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value427459339884466452
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.51.23.01.61.6

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-31
Value17294151262
Percentage of CashAndCashEquivalentsAtCarryingValue5.265.20.00.0
Percentage of Assets0.11.00.00.0
Percentage of Assets srt:ParentCompany0.31.30.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value8.2196.9258.075.6348.68111
Percentage of CashAndCashEquivalentsAtCarryingValue1.91.52.40.61.92.5
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary5.44.55.13.65.56.8

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value427459339884466328452436312268375
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.51.23.01.60.01.60.00.00.00.0

Short Term Investments

us-gaap:ShortTermInvestments us-gaap:ConsolidatedEntities

us-gaap:ShortTermInvestments

us-gaap:VariableInterestEntityPrimaryBeneficiary


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.50.50.50.50.5010.5
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary0.30.30.30.30.30.3

us-gaap:ShortTermInvestments us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value91712121028800501425
Percentage of ShortTermInvestments183516.2242468.4205675.8160158.6100017.485064.2
Percentage of Assets3.04.13.52.71.71.5
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.0

us-gaap:ShortTermInvestments us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value91712121028800501425
Percentage of ShortTermInvestments183516.2242468.4205675.8160158.6100017.485064.2
Percentage of Assets3.04.13.52.71.71.5
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value91712121028800501425
Percentage of ShortTermInvestments183516.2242468.4205675.8160158.6100017.485064.2
Percentage of Assets3.04.13.52.71.71.5
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.0

us-gaap:ShortTermInvestments us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value91712121028800501425
Percentage of ShortTermInvestments183516.2242468.4205675.8160158.6100017.485064.2
Percentage of Assets3.04.13.52.71.71.5
Percentage of Assets us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value292287281276269257
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.01.00.90.90.9

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value129125121117110106
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.4

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

srt:ParentCompany


Investments
Period End2020-12-312019-12-31
Value64533855
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0
Percentage of Assets21.913.5
Percentage of Assets srt:ParentCompany99.716.7

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecuritiesFvNi


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value234021642070184017141700
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0
Percentage of Assets7.77.37.06.35.95.9

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

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value233521612069184017131700
Percentage of EquitySecuritiesFvNi99.899.999.9100.0100.0100.0
Percentage of Assets7.77.27.06.25.95.9
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value4.5922.4091.0680.6240.6130.463
Percentage of EquitySecuritiesFvNi0.20.10.10.00.00.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.0

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

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommonStock, anat:ValuationTechniqueGuidelinePublicCompanyMethod


Equity
Period End2021-06-30
Value3.123
Percentage of EquitySecuritiesFvNi0.1
Percentage of Assets0.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring us-gaap:CommonStock anat:ValuationTechniqueGuidelinePublicCompanyMethod0.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommonStock, us-gaap:ValuationTechniqueOptionPricingModel


Equity
Period End2020-12-31
Value0.44
Percentage of EquitySecuritiesFvNi0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring us-gaap:CommonStock us-gaap:ValuationTechniqueOptionPricingModel0.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:PreferredStock, anat:ValuationTechniqueGuidelinePublicCompanyMethod


Equity
Period End2021-06-30
Value1.469
Percentage of EquitySecuritiesFvNi0.1
Percentage of Assets0.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring us-gaap:PreferredStock anat:ValuationTechniqueGuidelinePublicCompanyMethod0.0

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


Equity
Period End2020-12-31
Value0.628
Percentage of EquitySecuritiesFvNi0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring us-gaap:PreferredStock us-gaap:ValuationTechniqueOptionPricingModel0.0

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

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommonStock


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value232221472054182216961681
Percentage of EquitySecuritiesFvNi99.299.299.299.098.998.9
Percentage of Assets7.67.27.06.25.85.9
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring us-gaap:CommonStock0.00.00.00.00.00.0

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:PreferredStock


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value131414171718
Percentage of EquitySecuritiesFvNi0.60.70.71.01.01.1
Percentage of Assets0.00.00.10.10.10.1
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring us-gaap:PreferredStock0.00.00.00.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommonStock


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value3.1231.130.440.1570.1520.463
Percentage of EquitySecuritiesFvNi0.10.10.00.00.00.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring us-gaap:CommonStock0.00.00.00.00.00.0

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


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value1.4691.2790.6280.4670.4610.0
Percentage of EquitySecuritiesFvNi0.10.10.00.00.00.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring us-gaap:PreferredStock0.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value234021642070184017141700
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0
Percentage of Assets7.77.37.06.35.95.9
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value234021642070184017141700
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0
Percentage of Assets7.77.37.06.35.95.9
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value234021642070184017141700
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0
Percentage of Assets7.77.37.06.35.95.9
Percentage of Assets us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:FairValueMeasurementsRecurring, us-gaap:CommonStock


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value232521482055182216961682
Percentage of EquitySecuritiesFvNi99.499.399.299.099.098.9
Percentage of Assets7.77.27.06.25.95.9
Percentage of Assets us-gaap:FairValueMeasurementsRecurring us-gaap:CommonStock0.00.00.00.00.00.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:PreferredStock


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value141615181718
Percentage of EquitySecuritiesFvNi0.60.70.81.01.01.1
Percentage of Assets0.00.10.10.10.10.1
Percentage of Assets us-gaap:FairValueMeasurementsRecurring us-gaap:PreferredStock0.00.00.00.00.00.0

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value156162155187213171
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.50.60.70.6

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-31
Value17903
Percentage of OtherAssets11.4527.5
Percentage of Assets0.13.2
Percentage of Assets srt:ParentCompany0.33.9

us-gaap:VariableInterestEntityPrimaryBeneficiary


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value101413131115
Percentage of OtherAssets6.88.78.97.05.39.0
Percentage of Assets0.00.00.00.00.00.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary7.09.18.88.47.39.3

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value528478478414382394
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0
Percentage of Assets1.71.61.61.41.31.4

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value6994000.07276000.07297000.06307000.06255000.06014000.0
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.0

us-gaap:MinorityInterest us-gaap:ConsolidatedEntities

srt:Subsidiaries


Minority
Period End2020-12-312020-09-302020-06-302019-12-31
Value-900000.0-443000.0-495000.0-700000.0
Percentage of MinorityInterest-12.3-7.0-7.9-11.6
Percentage of Assets-0.0-0.0-0.0-0.0
Percentage of Assets srt:Subsidiaries0.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value676265046458614659665989
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0
Percentage of Assets22.321.821.920.920.620.9

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-31
Value64585989
Percentage of StockholdersEquity100.0100.0
Percentage of Assets21.920.9
Percentage of Assets srt:ParentCompany99.826.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value676965116465615259725607599558315767559252715255
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.321.821.920.920.60.021.00.00.00.00.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value-60.999-63.321-67.13-49.776-51.627-53.476-55.232-66.362-67.818-54.236-76.562
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.9-1.0-1.0-0.8-0.9-1.0-0.9-1.1-1.2-1.0-1.5
Percentage of Assets-0.2-0.2-0.2-0.2-0.20.0-0.20.00.00.00.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value23518529224721945157155157-42.469720
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest3.52.94.54.03.70.82.62.72.7-0.813.7
Percentage of Assets0.80.61.00.80.80.00.60.00.00.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value171119222194163-12.053998586-13.749-99.738642
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest2.51.83.43.22.7-0.21.71.51.5-0.2-1.912.2
Percentage of Assets0.60.40.80.70.60.00.30.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value-2.447-2.622-2.866-3.315-3.686-4.025-3.101-3.194-2.901-3.033-2.133
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.00.0-0.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value474747472121212020202019
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.70.70.70.80.40.40.40.40.40.40.40.4
Percentage of Assets0.20.20.20.20.10.00.10.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value0.2690.2690.2690.2693030303030303030
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.50.50.50.50.50.60.60.6
Percentage of Assets0.00.00.00.00.10.00.10.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value6.9947.2767.2976.3076.2556.0846.0145.1279.74712149.012
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.10.10.10.10.10.10.10.10.20.20.30.2
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value654263366188590358595669594657975727565054134656
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest96.697.395.796.098.1101.199.299.499.3101.0102.788.6
Percentage of Assets21.521.221.020.020.20.020.80.00.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.2690.2690.2690.2693030
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.10.1

us-gaap:CommonStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Common
Period End2020-12-312019-12-31
Value0.26930
Percentage of CommonStockValue100.0100.0
Percentage of Assets0.00.1
Percentage of Assets srt:ParentCompany0.00.1

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value474747472121
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.10.1

us-gaap:AdditionalPaidInCapitalCommonStock us-gaap:ConsolidatedEntities

srt:ParentCompany


Additional
Period End2020-12-312019-12-31
Value4721
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0
Percentage of Assets0.20.1
Percentage of Assets srt:ParentCompany0.70.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value654263366188590358595946
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0
Percentage of Assets21.521.221.020.020.220.8

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

srt:ParentCompany


Retained
Period End2020-12-312019-12-31
Value61885946
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0
Percentage of Assets21.020.8
Percentage of Assets srt:ParentCompany95.625.8

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value17111922219416399
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.40.80.70.60.3

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

srt:ParentCompany


Accumulated
Period End2020-12-312019-12-31
Value22299
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0
Percentage of Assets0.80.3
Percentage of Assets srt:ParentCompany3.40.4

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value6994000.07276000.07297000.06307000.06255000.06014000.0
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.0

us-gaap:MinorityInterest us-gaap:ConsolidatedEntities

srt:Subsidiaries


Minority
Period End2020-12-312020-09-302020-06-302019-12-31
Value-900000.0-443000.0-495000.0-700000.0
Percentage of MinorityInterest-12.3-7.0-7.9-11.6
Percentage of Assets-0.0-0.0-0.0-0.0
Percentage of Assets srt:Subsidiaries0.00.00.00.0

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders


Minority
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.3390.380.5990.3620.323181.9570.419
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.0

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.3390.380.5990.3620.323181.9570.419
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-11.236149811344.297112111163
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.014.4-21.312.60.429.1-13.417.5

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-138.435-133.902-318.012334-266.177-195.2527080
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.8-12.983.131.2-22.9-50.7-8.48.6

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value117103-307.544-50.977399-40.048-165.577-120.061
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.110.080.3-4.834.4-10.419.9-12.9

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-31.938119-544.136417137-123.24915123
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.711.5142.139.011.8-32.0-1.913.2

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value48-1.31382-57.38178-3.447-18.785-17.752
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-11.236149811344.297112111163
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.014.4-21.312.60.429.1-13.417.5

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value227170306171210-220.4441719298258
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.516.4-80.016.018.1-57.2-20.69.910.30.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value227170171210-220.4449298258
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.516.416.018.1-57.29.910.30.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value228170306171210-220.59717110597
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.516.4-80.116.018.2-57.2-20.611.410.2

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-138.435-133.902-318.012334-266.177-195.2527080
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.8-12.983.131.2-22.9-50.7-8.48.6

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value8.9449.9141013105.3545.3086.6
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value117103-307.544-50.977399-40.048-165.577-120.061
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.110.080.3-4.834.4-10.419.9-12.9

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value2222222222222222
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-31
Value478394
Percentage of DeferredTaxLiabilities100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-31
Value186184
Percentage of DeferredTaxAssetsNet100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-31
Value2458000.03083000.0
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0

anat:AllocatedShareBasedCompensationExpenseCredit us-gaap:AwardType

anat:AllocatedShareBasedCompensationExpenseCredit

us-gaap:RestrictedStockUnitsRSU


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1131000.0220000.0273000.0360000.0-14000.0-171000.074000.0154000.0578000.0
Percentage of AllocatedShareBasedCompensationExpenseCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockAppreciationRightsSARS


Allocated
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value000-1000.029000.01000.0-12000.0
Percentage of AllocatedShareBasedCompensationExpenseCredit0.00.0-0.00.639.20.6-2.1

anat:ChangeInUnrealizedGainsLossesOfInvestmentsAttributableToParticipatingPolicyholdersInterest us-gaap:FinancialInstrument

anat:ChangeInUnrealizedGainsLossesOfInvestmentsAttributableToParticipatingPolicyholdersInterest

us-gaap:DebtSecurities


Change
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.838-4.322-4.9522.9116-11.1511.0672.178
Percentage of ChangeInUnrealizedGainsLossesOfInvestmentsAttributableToParticipatingPolicyholdersInterest100.0100.0100.0100.0100.0100.0100.0100.0

anat:ClaimsIncurred

anat:ClaimsIncurred


Claims
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value306268263286307264279309298
Percentage of ClaimsIncurred100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:ClaimsIncurred us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Claims
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value262426272634272826
Percentage of ClaimsIncurred8.59.010.19.88.713.210.09.29.0

anat:PropertyAndCasualtySegment


Claims
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value280244236258280229251280271
Percentage of ClaimsIncurred91.591.089.990.291.386.890.090.891.0

anat:CommitmentsExpectedFundingCurrent

anat:CommitmentsExpectedFundingCurrent


Commitments
Period End2021-06-302021-03-312020-12-31
Value110572254
Percentage of CommitmentsExpectedFundingCurrent100.0100.0100.0

anat:DebtSecuritiesHeldToMaturityAllowanceForCreditLossDisposed

anat:DebtSecuritiesHeldToMaturityAllowanceForCreditLossDisposed


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value655000.0125000.01487000.01607000.0200000.07141000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossDisposed100.0100.0100.0100.0100.0100.0

anat:DebtSecuritiesHeldToMaturityAllowanceForCreditLossDisposed us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302020-12-312020-03-31
Value551000.0694000.0106000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossDisposed84.146.71.5

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value104000.0125000.0793000.01607000.0200000.06901000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossDisposed15.9100.053.3100.0100.096.6

anat:EffectiveIncomeTaxRateReconciliationFederalIncomeTaxExpenseBenefitContinuingOperationsBeforeInterestExpense

anat:EffectiveIncomeTaxRateReconciliationFederalIncomeTaxExpenseBenefitContinuingOperationsBeforeInterestExpense


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value20.420.320.40.19921.817.40.182
Percentage of EffectiveIncomeTaxRateReconciliationFederalIncomeTaxExpenseBenefitContinuingOperationsBeforeInterestExpense100.0100.0100.0100.0100.0100.0100.0

anat:EffectiveIncomeTaxRateReconciliationOnIncomeBeforeTaxOnEquityInEarningsOfUnconsolidatedAffiliates

anat:EffectiveIncomeTaxRateReconciliationOnIncomeBeforeTaxOnEquityInEarningsOfUnconsolidatedAffiliates


Effective
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value0.619.30.2211.013.70.181
Percentage of EffectiveIncomeTaxRateReconciliationOnIncomeBeforeTaxOnEquityInEarningsOfUnconsolidatedAffiliates100.0100.0100.0100.0100.0100.0

anat:EffectiveIncomeTaxRateReconciliationOnTaxOnEquityInEarningsOfUnconsolidatedAffiliates

anat:EffectiveIncomeTaxRateReconciliationOnTaxOnEquityInEarningsOfUnconsolidatedAffiliates


Effective
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value-0.61.7-0.011-1.07.30.029
Percentage of EffectiveIncomeTaxRateReconciliationOnTaxOnEquityInEarningsOfUnconsolidatedAffiliates100.0100.0100.0100.0100.0100.0

anat:EffectiveIncomeTaxRateReconciliationTaxCreditLowIncomeHousingExpensePercent

anat:EffectiveIncomeTaxRateReconciliationTaxCreditLowIncomeHousingExpensePercent


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.50.7-1.10.50.004-0.60.11.00.015
Percentage of EffectiveIncomeTaxRateReconciliationTaxCreditLowIncomeHousingExpensePercent100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:FairValueMeasurementWithUnobservableInputsReconciliationLiabilityPremiumsLessBenefitsLosses us-gaap:DerivativeInstrumentRisk

anat:FairValueMeasurementWithUnobservableInputsReconciliationLiabilityPremiumsLessBenefitsLosses

us-gaap:EmbeddedDerivativeFinancialInstruments


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value7.4568.8125.958-26.982-17.473-11.019-16.352-15.372-9.064
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationLiabilityPremiumsLessBenefitsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesNetChangeIncludedInInterestCredited us-gaap:DerivativeInstrumentRisk

anat:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesNetChangeIncludedInInterestCredited

us-gaap:EmbeddedDerivativeFinancialInstruments


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value28265.2754462-89.581561136
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesNetChangeIncludedInInterestCredited100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:FederalIncomeTaxExpenseBenefitContinuingOperationsBeforeInterestExpense

anat:FederalIncomeTaxExpenseBenefitContinuingOperationsBeforeInterestExpense


Federal
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value58434352-61.6682221
Percentage of FederalIncomeTaxExpenseBenefitContinuingOperationsBeforeInterestExpense100.0100.0100.0100.0100.0100.0100.0

anat:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestBeforeIncomeLossFromEquityMethodInvestments

anat:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestBeforeIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value227169280154224-221.1681676181
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestBeforeIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:IncomeTaxReconciliationIncomeTaxExpenseBenefitBeforeTaxOnEquityEarningsOfUnconsolidatedAffiliates

anat:IncomeTaxReconciliationIncomeTaxExpenseBenefitBeforeTaxOnEquityEarningsOfUnconsolidatedAffiliates


Income
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value764158461721
Percentage of IncomeTaxReconciliationIncomeTaxExpenseBenefitBeforeTaxOnEquityEarningsOfUnconsolidatedAffiliates100.0100.0100.0100.0100.0100.0

anat:IncomeTaxReconciliationTaxCreditsLowIncomeHousing

anat:IncomeTaxReconciliationTaxCreditsLowIncomeHousing


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1375000.01513000.01170000.0997000.0982000.01774000.02129000.01324000.01783000.0
Percentage of IncomeTaxReconciliationTaxCreditsLowIncomeHousing100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:IncomeTaxReconciliationTaxOnEquityEarningsOfUnconsolidatedAffiliates

anat:IncomeTaxReconciliationTaxOnEquityEarningsOfUnconsolidatedAffiliates


Income
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value4.9043.576-2.860.2479.4653.526
Percentage of IncomeTaxReconciliationTaxOnEquityEarningsOfUnconsolidatedAffiliates100.0100.0100.0100.0100.0100.0

anat:IncreaseDecreaseInCollateralHeldForDerivatives

anat:IncreaseDecreaseInCollateralHeldForDerivatives


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-5.681-13.136-28.168-26.608-57.654128-31.3067.342
Percentage of IncreaseDecreaseInCollateralHeldForDerivatives100.0100.0100.0100.0100.0100.0100.0100.0

anat:MortgageLoansOnRealEstateFiledForBankruptcy

anat:MortgageLoansOnRealEstateFiledForBankruptcy


Mortgage
Period End2021-03-312020-12-31
Value9230000.00
Percentage of MortgageLoansOnRealEstateFiledForBankruptcy100.00.0

anat:MortgageLoansOnRealEstateForeclosuresProcess

anat:MortgageLoansOnRealEstateForeclosuresProcess


Mortgage
Period End2021-03-312020-12-312020-09-30
Value5.168-19.335.996
Percentage of MortgageLoansOnRealEstateForeclosuresProcess100.0100.0100.0

anat:MortgageLoansOnRealEstateForeclosuresProcessTotal

anat:MortgageLoansOnRealEstateForeclosuresProcessTotal


Mortgage
Period End2021-03-312020-12-31
Value14-19.33
Percentage of MortgageLoansOnRealEstateForeclosuresProcessTotal100.0100.0

anat:NetCapitalizedInterestOnPolicyLoansAndMortgageLoans

anat:NetCapitalizedInterestOnPolicyLoansAndMortgageLoans


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value8.168.9697.7718.4717.7746.3518.3627.322
Percentage of NetCapitalizedInterestOnPolicyLoansAndMortgageLoans100.0100.0100.0100.0100.0100.0100.0100.0

anat:OtherComprehensiveIncomeUnrealizedAdjustmentToDacDuringPeriodNetOfTax

anat:OtherComprehensiveIncomeUnrealizedAdjustmentToDacDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value-16.68326-87.34770
Percentage of OtherComprehensiveIncomeUnrealizedAdjustmentToDacDuringPeriodNetOfTax100.0100.0100.0100.0

anat:OtherComprehensiveIncomeUnrealizedAdjustmentToDacDuringPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-16.68326-24.604-12.71-87.34770-3.489-37.711
Percentage of OtherComprehensiveIncomeUnrealizedAdjustmentToDacDuringPeriodNetOfTax100.0100.00.00.0100.0100.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-12-312020-09-302019-12-312019-09-30
Value-24.604-12.71-3.489-37.711
Percentage of OtherComprehensiveIncomeUnrealizedAdjustmentToDacDuringPeriodNetOfTax0.00.00.00.0

anat:OtherComprehensiveIncomeUnrealizedAdjustmentToDeferredPolicyAcquisitionCostsArisingDuringPeriodTax

anat:OtherComprehensiveIncomeUnrealizedAdjustmentToDeferredPolicyAcquisitionCostsArisingDuringPeriodTax


Other
Period End2021-06-302021-03-31
Value-4.4357.05
Percentage of OtherComprehensiveIncomeUnrealizedAdjustmentToDeferredPolicyAcquisitionCostsArisingDuringPeriodTax100.0100.0

anat:OtherComprehensiveIncomeUnrealizedAdjustmentToDeferredPolicyAcquisitionCostsArisingDuringPeriodTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-09-302020-06-302020-03-312019-09-30
Value-3.379-23.21918-10.023
Percentage of OtherComprehensiveIncomeUnrealizedAdjustmentToDeferredPolicyAcquisitionCostsArisingDuringPeriodTax0.00.00.00.0

anat:OtherComprehensiveIncomeUnrealizedGainsLossOnSecuritiesInvestmentsAttributableToParticipatingPolicyholdersInterestNetOfTax

anat:OtherComprehensiveIncomeUnrealizedGainsLossOnSecuritiesInvestmentsAttributableToParticipatingPolicyholdersInterestNetOfTax


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.662-3.41412-8.809
Percentage of OtherComprehensiveIncomeUnrealizedGainsLossOnSecuritiesInvestmentsAttributableToParticipatingPolicyholdersInterestNetOfTax100.0100.0100.0100.0

anat:OtherComprehensiveIncomeUnrealizedGainsLossOnSecuritiesInvestmentsAttributableToParticipatingPolicyholdersInterestNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.662-3.414-3.9122.29912-8.8090.8431.72
Percentage of OtherComprehensiveIncomeUnrealizedGainsLossOnSecuritiesInvestmentsAttributableToParticipatingPolicyholdersInterestNetOfTax100.0100.00.00.0100.0100.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-12-312020-09-302019-12-312019-09-30
Value-3.9122.2990.8431.72
Percentage of OtherComprehensiveIncomeUnrealizedGainsLossOnSecuritiesInvestmentsAttributableToParticipatingPolicyholdersInterestNetOfTax0.00.00.00.0

anat:OtherComprehensiveIncomeUnrealizedGainsLossesOnInvestmentsAttributableToParticipatingPolicyholdersInterestArisingDuringPeriodTax

anat:OtherComprehensiveIncomeUnrealizedGainsLossesOnInvestmentsAttributableToParticipatingPolicyholdersInterestArisingDuringPeriodTax


Other
Period End2021-06-302021-03-31
Value-176000.0908000.0
Percentage of OtherComprehensiveIncomeUnrealizedGainsLossesOnInvestmentsAttributableToParticipatingPolicyholdersInterestArisingDuringPeriodTax100.0100.0

anat:OtherComprehensiveIncomeUnrealizedGainsLossesOnInvestmentsAttributableToParticipatingPolicyholdersInterestArisingDuringPeriodTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-09-302020-06-302020-03-312019-09-30
Value-611000.0-3403000.02342000.0-458000.0
Percentage of OtherComprehensiveIncomeUnrealizedGainsLossesOnInvestmentsAttributableToParticipatingPolicyholdersInterestArisingDuringPeriodTax0.00.00.00.0

anat:ParValueReclassifiedDueToReorganization us-gaap:StatementEquityComponents

anat:ParValueReclassifiedDueToReorganization

us-gaap:AdditionalPaidInCapital


Par
Period End2020-09-30
Value-26.618
Percentage of ParValueReclassifiedDueToReorganization100.0

us-gaap:CommonStock


Par
Period End2020-09-30
Value26
Percentage of ParValueReclassifiedDueToReorganization-100.0

anat:PaymentstoAcquireEquityInvestments

anat:PaymentstoAcquireEquityInvestments


Paymentsto
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1632302244340.030
Percentage of PaymentstoAcquireEquityInvestments100.0100.0100.0100.0100.0100.00.0100.0

anat:PolicyHolderBenefitsAndClaimsIncurredAnnuity

anat:PolicyHolderBenefitsAndClaimsIncurredAnnuity


Policy
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value424487464434275972
Percentage of PolicyHolderBenefitsAndClaimsIncurredAnnuity100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:PolicyHolderBenefitsAndClaimsIncurredLife

anat:PolicyHolderBenefitsAndClaimsIncurredLife


Policy
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value139146144153124110121113104
Percentage of PolicyHolderBenefitsAndClaimsIncurredLife100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:PolicyholderBenefits

anat:PolicyholderBenefits


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value182190232200169145149173177
Percentage of PolicyholderBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:PolicyholderBenefits us-gaap:StatementBusinessSegments

anat:AnnuitySegment


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value424487464434275972
Percentage of PolicyholderBenefits23.423.437.823.226.524.018.334.441.1

anat:LifeSegment


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value139146144153124110121113104
Percentage of PolicyholderBenefits76.676.662.276.873.576.081.765.658.9

anat:ProceedsfromSaleofEquitySecurities

anat:ProceedsfromSaleofEquitySecurities


Proceedsfrom
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value273538474.132711529
Percentage of ProceedsfromSaleofEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0

anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-31
Value0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue0.0

anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageGrantDateFairValue

us-gaap:StockAppreciationRightsSARS


Share
Period End2020-12-31
Value0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageGrantDateFairValue0.0

anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice us-gaap:AwardType

anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice

us-gaap:RestrictedStock


Share
Period End2021-06-302021-03-31
Value080.05
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice0.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-30
Value38.075.350-37.84
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice0.094.10.00.0

anat:UnamortizedOriginationFees

anat:UnamortizedOriginationFees


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-30
Value-0.424-0.901-1.859
Percentage of UnamortizedOriginationFees100.0100.0100.0100.0

srt:MortgageLoansOnRealEstateInterestRate us-gaap:RelatedPartyTransactionsByRelatedParty

srt:MortgageLoansOnRealEstateInterestRate

srt:AffiliatedEntity


Mortgage
Period End2020-12-31
Value0
Percentage of MortgageLoansOnRealEstateInterestRate0.0

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments


Accretion
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-4.549-2.9912.978-8.606-2.006-1.8450.5321.315
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionsToContractHoldersFunds

us-gaap:AdditionsToContractHoldersFunds


Additions
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value707450327343267294211270
Percentage of AdditionsToContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value20000.019000.020000.020000.020000.020000.020000.020000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value20000.019000.020000.020000.020000.020000.020000.020000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ConcentrationRiskByType, us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:ConcentrationRiskPercentage1

us-gaap:CreditConcentrationRisk, us-gaap:EquitySecurities, anat:ConsumerGoods


Concentration
Period End2021-03-312020-03-31
Value18.418.9
Percentage of ConcentrationRiskPercentage1100.0100.0

us-gaap:CreditConcentrationRisk, us-gaap:EquitySecurities, anat:EnergyAndUtilities


Concentration
Period End2021-03-312020-03-31
Value5.88.0
Percentage of ConcentrationRiskPercentage131.542.3

us-gaap:CreditConcentrationRisk, us-gaap:EquitySecurities, anat:Finance


Concentration
Period End2021-03-312020-03-31
Value22.918.0
Percentage of ConcentrationRiskPercentage1124.595.2

us-gaap:CreditConcentrationRisk, us-gaap:EquitySecurities, anat:Industrials


Concentration
Period End2021-03-312020-03-31
Value7.77.6
Percentage of ConcentrationRiskPercentage141.840.2

us-gaap:CreditConcentrationRisk, us-gaap:EquitySecurities, anat:InformationTechnology


Concentration
Period End2021-03-312020-03-31
Value26.225.0
Percentage of ConcentrationRiskPercentage1142.4132.3

us-gaap:CreditConcentrationRisk, us-gaap:EquitySecurities, anat:MarketableEquitySecuritiesOther


Concentration
Period End2021-03-312020-03-31
Value4.59.5
Percentage of ConcentrationRiskPercentage124.550.3

us-gaap:CreditConcentrationRisk, us-gaap:EquitySecurities, us-gaap:HealthCare


Concentration
Period End2021-03-312020-03-31
Value14.513.0
Percentage of ConcentrationRiskPercentage178.868.8

us-gaap:ConcentrationRiskPercentage1 us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType

srt:ApartmentBuilding, anat:PropertyTypeConcentrationRisk, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value13.1
Percentage of ConcentrationRiskPercentage171.2

srt:Hotel, anat:PropertyTypeConcentrationRisk, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value6.6
Percentage of ConcentrationRiskPercentage135.9

srt:IndustrialProperty, anat:PropertyTypeConcentrationRisk, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value12.7
Percentage of ConcentrationRiskPercentage169.0

srt:OfficeBuilding, anat:PropertyTypeConcentrationRisk, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value31.7
Percentage of ConcentrationRiskPercentage1172.3

srt:OtherProperty, anat:PropertyTypeConcentrationRisk, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value2.0
Percentage of ConcentrationRiskPercentage110.9

srt:RetailSite, anat:PropertyTypeConcentrationRisk, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value28.6
Percentage of ConcentrationRiskPercentage1155.4

us-gaap:Land, anat:PropertyTypeConcentrationRisk, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value5.3
Percentage of ConcentrationRiskPercentage128.8

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

anat:EastNorthCentral, us-gaap:AccountsReceivable, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-312020-03-31
Value14.413.1
Percentage of ConcentrationRiskPercentage178.369.3

anat:EastSouthCentral, us-gaap:AccountsReceivable, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-312020-03-31
Value2.72.8
Percentage of ConcentrationRiskPercentage114.714.8

anat:Mountain, us-gaap:AccountsReceivable, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-312020-03-31
Value25.823.6
Percentage of ConcentrationRiskPercentage1140.2124.9

anat:OtherGeographicalArea, us-gaap:AccountsReceivable, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-312020-03-31
Value5.76.6
Percentage of ConcentrationRiskPercentage131.034.9

anat:Pacific, us-gaap:AccountsReceivable, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-312020-03-31
Value15.316.7
Percentage of ConcentrationRiskPercentage183.288.4

anat:SouthAtlantic, us-gaap:AccountsReceivable, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-312020-03-31
Value11.212.2
Percentage of ConcentrationRiskPercentage160.964.6

anat:WestSouthCentral, us-gaap:AccountsReceivable, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-312020-03-31
Value24.925.0
Percentage of ConcentrationRiskPercentage1135.3132.3

us-gaap:ConcentrationRiskPercentage1 us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByType, us-gaap:InvestmentType

anat:EastNorthCentral, anat:GeographicLocation, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value10.3
Percentage of ConcentrationRiskPercentage156.0

anat:EastSouthCentral, anat:GeographicLocation, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value6.7
Percentage of ConcentrationRiskPercentage136.4

anat:Mountain, anat:GeographicLocation, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value14.4
Percentage of ConcentrationRiskPercentage178.3

anat:OtherGeographicalArea, anat:GeographicLocation, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value1.1
Percentage of ConcentrationRiskPercentage16.0

anat:Pacific, anat:GeographicLocation, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value12.0
Percentage of ConcentrationRiskPercentage165.2

anat:SouthAtlantic, anat:GeographicLocation, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value9.7
Percentage of ConcentrationRiskPercentage152.7

anat:WestSouthCentral, anat:GeographicLocation, us-gaap:RealEstateInvestment


Concentration
Period End2021-03-31
Value45.8
Percentage of ConcentrationRiskPercentage1248.9

us-gaap:CurrentFederalTaxExpenseBenefit

us-gaap:CurrentFederalTaxExpenseBenefit


Current
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value22162620-13.71424544.43314
Percentage of CurrentFederalTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded


Debt
Period End2021-06-302021-03-312020-09-302020-06-30
Value756000.03000.04771000.01276000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-30
Value26000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded3.4

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302020-09-302020-06-30
Value720000.04771000.01276000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded95.2100.0100.0

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-30
Value2000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.3

us-gaap:USStatesAndPoliticalSubdivisions


Debt
Period End2021-06-30
Value8000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded1.1

us-gaap:USTreasuryAndGovernment


Debt
Period End2021-03-31
Value3000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease


Debt
Period End2021-06-302020-12-312020-09-302020-06-30
Value1173000.0116000.028000.073000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-30
Value192000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease16.4

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302020-12-312020-09-302020-06-30
Value981000.0116000.028000.073000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease83.6100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold


Debt
Period End2021-06-302020-12-312020-09-302020-06-30
Value4221000.029000.033000.010000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302020-12-31
Value182000.06000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold4.320.7

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302020-12-312020-09-302020-06-30
Value4039000.023000.033000.07000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold95.779.3100.070.0

us-gaap:DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal

us-gaap:DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-1.2661.231-0.2431.24310-12.865
Percentage of DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-0.0870.4880.0180.0740.155-0.236
Percentage of DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal6.939.6-7.46.01.51.8

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-1.1810.733-0.2551.15310-12.499
Percentage of DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal93.359.5104.992.899.397.2

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.0050.01-0.0060.016-0.083-0.13
Percentage of DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal-0.40.82.51.3-0.81.0

us-gaap:USTreasuryAndGovernment


Debt
Period End2021-06-30
Value-0.003
Percentage of DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal0.2

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain


Debt
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value59000.00212000.00412000.0194000.056000.00
Percentage of DebtSecuritiesAvailableForSaleRealizedGain100.00.0100.00.0100.0100.0100.00.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value073000.004072000.01101000.000
Percentage of DebtSecuritiesAvailableForSaleRealizedLoss0.0100.00.0100.0100.00.00.0

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value974000.0228000.041000.010000.0116000.0945000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2020-09-302020-03-31
Value6000.0323000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease60.034.2

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value974000.0228000.041000.04000.0116000.0622000.0
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease100.0100.0100.040.0100.065.8

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-1.9716.3097.603-0.674-1.0290.279
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-4.2442.004-2.263-0.4080.454-0.018
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal215.331.8-29.860.5-44.1-6.5

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value2.2894.21510-0.231-1.4810.162
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal-116.166.8135.234.3143.958.1

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-0.0160.09-0.417-0.0350.0030.134
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal0.81.4-5.55.2-0.348.0

us-gaap:DebtSecuritiesHeldToMaturityTransferAmount

us-gaap:DebtSecuritiesHeldToMaturityTransferAmount


Debt
Period End2020-12-312019-12-31
Value-88568.3-0.039
Percentage of DebtSecuritiesHeldToMaturityTransferAmount100.0100.0

us-gaap:DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment

us-gaap:DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value101910173.9394.1485.77631-2.937
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment us-gaap:InvestmentType

anat:OtherInvestedAssets


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.0030.347-0.0350.005-0.006-0.023-0.1240.567-2.276
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment0.01.8-0.30.0-0.2-0.6-2.11.877.5

us-gaap:DebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value117.6997.7716.1173.9525.4785.0736.0752.611
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment108.240.076.335.2100.3132.187.819.0-88.9

us-gaap:Mortgages


Debt
Period End2021-06-302020-06-302019-12-312019-09-302019-06-30
Value-0.7680.0-0.226-2.097-0.544
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment-7.20.0-3.9-6.618.5

us-gaap:RealEstateInvestment


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-0.101112.4511-0.007-1.3071.05327-2.728
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment-1.058.224.164.8-0.2-31.518.285.892.9

us-gaap:DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment us-gaap:TransactionType

anat:CallsAndMaturities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value117.267.8175.9864.0259.126.3436.1
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment106.737.776.734.4102.2219.9109.819.1

anat:Impairments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-0.768-1.2650.00.00.0-1.2760.785-2.59-4.7
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment-7.2-6.60.00.00.0-30.813.6-8.1160.0

anat:Others


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-0.066-0.093-0.034-0.009-0.013-0.097-0.169-0.0020.01
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment-0.6-0.5-0.3-0.1-0.3-2.3-2.9-0.0-0.3

anat:Paydowns


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.0930.439-0.047-0.007-0.0730.019-0.362-0.0810.319
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment0.92.3-0.5-0.0-1.90.5-6.3-0.3-10.9

us-gaap:Sales


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.027122.45110.0-3.618-0.59528-0.583
Percentage of DebtSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairment0.367.024.165.70.0-87.2-10.389.319.9

us-gaap:DeferredFederalIncomeTaxExpenseBenefit

us-gaap:DeferredFederalIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value3627562365-86.171-0.971187.717
Percentage of DeferredFederalIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss

us-gaap:DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value21-33.573116
Percentage of DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss us-gaap:FinancialInstrument

us-gaap:DebtSecurities


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-21.11933-31.145-16.089-110.56689-4.416-47.734
Percentage of DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss-100.0-100.0-100.0-100.00.00.00.00.0

us-gaap:DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss us-gaap:StatementBusinessSegments

anat:AnnuitySegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value17-24.6552812
Percentage of DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss85.073.490.278.4

anat:LifeSegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value3.171-8.9153.053.48
Percentage of DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss15.026.69.821.6

us-gaap:DeferredPolicyAcquisitionCostsAdditions

us-gaap:DeferredPolicyAcquisitionCostsAdditions


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value162156150133
Percentage of DeferredPolicyAcquisitionCostsAdditions100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostsAdditions us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value3.0352.8493.8094.534
Percentage of DeferredPolicyAcquisitionCostsAdditions1.91.82.53.4

anat:AnnuitySegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value30231814
Percentage of DeferredPolicyAcquisitionCostsAdditions18.715.012.111.1

anat:LifeSegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value37434734
Percentage of DeferredPolicyAcquisitionCostsAdditions23.027.731.925.8

anat:PropertyAndCasualtySegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value91868079
Percentage of DeferredPolicyAcquisitionCostsAdditions56.455.453.459.7

us-gaap:DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease

us-gaap:DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value7.72361-40.229-7.702
Percentage of DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value-1.531-0.854-0.2750.542
Percentage of DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease-19.8-1.40.7-7.0

anat:AnnuitySegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value-6.29935-48.246-21.164
Percentage of DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease-81.657.9119.9274.8

anat:LifeSegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value10231512
Percentage of DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease133.237.9-39.4-156.1

anat:PropertyAndCasualtySegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value5.2653.433-7.5420.901
Percentage of DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease68.25.618.7-11.7

us-gaap:DepreciationNonproduction

us-gaap:DepreciationNonproduction


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1312131313121210
Percentage of DepreciationNonproduction100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DerivativeGainLossOnDerivativeNet

anat:EquityIndexedOptions, us-gaap:Nondesignated, us-gaap:InvestmentIncome


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4028543867-108.095496.27823
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmbeddedDerivativeFinancialInstruments, us-gaap:Nondesignated, anat:InterestCreditedToPolicyholdersAccountBalances


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-28.46-26.689-5.275-44.792-62.49189-56.138-11.462-36.255
Percentage of DerivativeGainLossOnDerivativeNet-70.7-92.6-9.7-115.6-93.1-82.9-114.4-182.6-156.8

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value2222222222222222
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value2222222222222222
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance


Effective
Period End2020-12-312020-09-302020-06-302019-09-302019-06-30
Value-0.20.10600.10.001
Percentage of EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance100.0100.00.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsDividends

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsDividends


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.30.4-0.71.3140.005-0.30.10.60.007
Percentage of EffectiveIncomeTaxRateReconciliationDeductionsDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.10.4-0.30.40-0.1-0.2-0.3-0.001
Percentage of EffectiveIncomeTaxRateReconciliationOtherAdjustments100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCredits

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCredits


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.50.8-1.81.00.006-0.8-0.21.20.027
Percentage of EffectiveIncomeTaxRateReconciliationTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxExemptIncome

us-gaap:EffectiveIncomeTaxRateReconciliationTaxExemptIncome


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.40.6-0.90.50.004-0.400.80.009
Percentage of EffectiveIncomeTaxRateReconciliationTaxExemptIncome100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions

us-gaap:EquityMethodInvestmentDividendsOrDistributions


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value361736134.167278.7238
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiGainLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value17095237152298-332.5751408.58967
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiGainLoss us-gaap:FinancialInstrument

us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value17095237152298-332.5751408.58967
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiGainLoss us-gaap:StatementBusinessSegments

us-gaap:CorporateAndOther


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value17095237152298-332.5751408.58967
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiRealizedGainLoss us-gaap:FinancialInstrument

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-1.569-0.8267.181-1.9570.0321.026234.98415
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss us-gaap:FinancialInstrument

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:EquitySecurities


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value17296230154298-333.6011173.60551
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value4.47.9-27.588407-21.159593-67.25212733-4.765
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

anat:EquityIndexedOptions


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4028543867-108.095496.27823
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

anat:InvestmentSecurities


Fair
Period End2021-06-302021-03-312020-09-302020-06-302019-06-30
Value703000.01178000.06000.000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0100.0100.00.00.0

anat:SeparatelyManagedAccounts


Fair
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value28000.0594000.03663000.0-4046000.080000.00-11000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss4.050.461050.00.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

anat:EquityIndexedOptions


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value262023192414191721
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:InvestmentSecurities


Fair
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value18271586220.4630.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases71.3136.379.0356.2160.32.70.0

anat:SeparatelyManagedAccounts


Fair
Period End2021-06-302021-03-312020-09-302020-06-302019-09-302019-06-30
Value12107.4219.0429.4387.412
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases48.150.038.537.355.434.6

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

anat:InvestmentSecurities


Fair
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value11110.3836140.113
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.0100.0100.0100.0100.0

anat:SeparatelyManagedAccounts


Fair
Period End2021-06-302021-03-312020-09-302020-06-30
Value1.7448.1090.5693.948
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales15.069.6149.710.8

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

anat:EquityIndexedOptions


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value593740352536361629
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

anat:InvestmentSecurities


Fair
Period End2021-06-30
Value1479000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.0

us-gaap:FederalIncomeTaxExpenseBenefitContinuingOperations

us-gaap:FederalIncomeTaxExpenseBenefitContinuingOperations


Federal
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value5843824352-61.668532221
Percentage of FederalIncomeTaxExpenseBenefitContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2


Financing
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value4.33610.3518978.834-19.55
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment2100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2 us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

anat:StorageBuilding


Financing
Period End2021-06-302021-03-31
Value0.0058.937
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment20.114.5

srt:Hotel


Financing
Period End2020-12-312020-09-30
Value0.124469
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment235.352.3

srt:IndustrialProperty


Financing
Period End2020-12-312020-09-30
Value0.09211
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment226.21.3

srt:OfficeBuilding


Financing
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value-0.149140.0197611-0.06
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment2-3.423.85.48.5135.20.3

srt:OtherProperty


Financing
Period End2020-12-312020-09-30
Value-79.641113
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment2-22689.712.7

srt:RetailSite


Financing
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value4.469280.03257-3.1061.105
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment2103.245.99.16.4-35.2-5.7

us-gaap:Parking


Financing
Period End2021-06-302021-03-312020-12-31
Value0.0059.7379
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment20.115.822713.7

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2


Financing
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value4.33610.3518978.834-19.55
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment2100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2 us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

anat:StorageBuilding


Financing
Period End2021-06-302021-03-31
Value0.0058.937
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.114.5

srt:Hotel


Financing
Period End2020-12-312020-09-30
Value0.124469
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment235.352.3

srt:IndustrialProperty


Financing
Period End2020-12-312020-09-30
Value0.09211
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment226.21.3

srt:OfficeBuilding


Financing
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value-0.149140.0197611-0.06
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment2-3.423.85.48.5135.20.3

srt:OtherProperty


Financing
Period End2020-12-312020-09-30
Value-79.641113
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment2-22689.712.7

srt:RetailSite


Financing
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value4.469280.03257-3.1061.105
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment2103.245.99.16.4-35.2-5.7

us-gaap:Parking


Financing
Period End2021-06-302021-03-312020-12-31
Value0.0059.7379
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.115.822713.7

us-gaap:GuaranteeObligationsLiquidationProceeds

us-gaap:GuaranteeObligationsLiquidationProceeds


Guarantee
Period End2021-06-302021-03-312020-12-31
Value-2.61430.781
Percentage of GuaranteeObligationsLiquidationProceeds100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value41232317-13.622151.1764516
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:InvestmentType

anat:RealEstateInvestmentAndPartnershipInterest


Income
Period End2021-06-302020-06-30
Value39-13.6
Percentage of IncomeLossFromEquityMethodInvestments95.699.8

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4000.029000.0-759000.011000.012000.0112000.0148000.070000.0165000.0
Percentage of IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationDeductionsDividends

us-gaap:IncomeTaxReconciliationDeductionsDividends


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value779000.0813000.0802000.0-10000.01443000.0862000.01030000.0817000.0860000.0
Percentage of IncomeTaxReconciliationDeductionsDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value5944814555-59.396462725
Percentage of IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationMinorityInterestIncomeExpense

us-gaap:IncomeTaxReconciliationMinorityInterestIncomeExpense


Income
Period End2020-09-302019-09-30
Value104000.02284000.0
Percentage of IncomeTaxReconciliationMinorityInterestIncomeExpense100.0100.0

us-gaap:IncomeTaxReconciliationOtherAdjustments

us-gaap:IncomeTaxReconciliationOtherAdjustments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value244000.0607000.01156000.01022000.093000.0126000.0-893000.0-452000.0-77000.0
Percentage of IncomeTaxReconciliationOtherAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationTaxCredits

us-gaap:IncomeTaxReconciliationTaxCredits


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1347000.01618000.01428000.02127000.01534000.02395000.0578000.01521000.03299000.0
Percentage of IncomeTaxReconciliationTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationTaxExemptIncome

us-gaap:IncomeTaxReconciliationTaxExemptIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1111000.01172000.01113000.01062000.01061000.01027000.01024000.01027000.01109000.0
Percentage of IncomeTaxReconciliationTaxExemptIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-6.772-2.6294.7340.38719-8.6049.197-5.915
Percentage of IncreaseDecreaseInAccruedInvestmentIncomeReceivable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2828-9.0848.3874.7031.672-9.642-1.54817
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-1.531-0.854-0.2750.5420.0170.023-0.463-0.2580.146
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts-5.3-3.03.06.50.41.44.816.70.8

anat:AnnuitySegment


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1111-20.151-8.555-12.306-7.286-9.857-7.0064.369
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts40.439.4221.8-102.0-261.7-435.8102.2452.625.2

anat:LifeSegment


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value13141815117.8386.9165.089.205
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts46.751.5-207.9184.8245.3468.8-71.7-328.253.2

anat:PropertyAndCasualtySegment


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value5.2653.433-7.5420.9015.4571.097-6.2380.6363.588
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts18.312.283.010.7116.065.664.7-41.120.7

us-gaap:IncreaseDecreaseInFairValueAdjustmentsOnAssetsAndLiabilitiesCarriedAtFairValueUnderFairValueOption

us-gaap:IncreaseDecreaseInFairValueAdjustmentsOnAssetsAndLiabilitiesCarriedAtFairValueUnderFairValueOption


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value4028543867-108.095496.277
Percentage of IncreaseDecreaseInFairValueAdjustmentsOnAssetsAndLiabilitiesCarriedAtFairValueUnderFairValueOption100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInIncomeTaxesReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value34-14.127-5.058.19618-22.392-24.22815
Percentage of IncreaseDecreaseInIncomeTaxesReceivable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInsuranceLiabilities

us-gaap:IncreaseDecreaseInInsuranceLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value281302372118-4.203-22.95647
Percentage of IncreaseDecreaseInInsuranceLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value4625000.0-3291000.0-5361000.0-2772000.0-2753000.0-2879000.0-5498000.0-987000.0
Percentage of IncreaseDecreaseInPensionAndPostretirementObligations100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPremiumsReceivable

us-gaap:IncreaseDecreaseInPremiumsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value2121-20.563-21.0211535-19.769-2.324
Percentage of IncreaseDecreaseInPremiumsReceivable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidReinsurancePremiums

us-gaap:IncreaseDecreaseInPrepaidReinsurancePremiums


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1396000.0-1997000.02230000.01936000.0-169000.0-5862000.0-6469000.0144000.0
Percentage of IncreaseDecreaseInPrepaidReinsurancePremiums100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReinsuranceRecoverable

us-gaap:IncreaseDecreaseInReinsuranceRecoverable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-41.13629-63.5454527-6.207-22.963-2.359
Percentage of IncreaseDecreaseInReinsuranceRecoverable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value7522.07699.0-250.07558.08445.09975.02239.06472.07264.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncurredClaimsPropertyCasualtyAndLiability

us-gaap:IncurredClaimsPropertyCasualtyAndLiability


Incurred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value280244236258280229251280271
Percentage of IncurredClaimsPropertyCasualtyAndLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InsuranceCommissions

us-gaap:InsuranceCommissions


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value163153144138140130124128141
Percentage of InsuranceCommissions100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InsuranceCommissions us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value6.5655.9867.397.6087.168.0248.6497.4058.692
Percentage of InsuranceCommissions4.03.95.15.55.16.27.05.86.2

anat:AnnuitySegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2923171611107.9771323
Percentage of InsuranceCommissions18.315.012.411.68.37.96.410.416.4

anat:LifeSegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value464544414139414240
Percentage of InsuranceCommissions28.329.631.130.329.430.333.532.728.9

anat:PropertyAndCasualtySegment


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value817974728072656568
Percentage of InsuranceCommissions49.451.651.452.557.255.753.151.248.5

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 us-gaap:StatementBusinessSegments

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

anat:PropertyAndCasualtyAccidentAndHealth


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1849918622717295205210
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 us-gaap:StatementBusinessSegments

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

anat:PropertyAndCasualtyAccidentAndHealth


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value971606566921746494
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 us-gaap:StatementBusinessSegments

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

anat:PropertyAndCasualtyAccidentAndHealth


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value302269264283304264279309
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermPurchaseCommitmentAmount

us-gaap:LongTermPurchaseCommitmentAmount


Long
Period End2021-06-302021-03-312020-12-31
Value3001300-162.9
Percentage of LongTermPurchaseCommitmentAmount100.0100.0100.0

us-gaap:MortgageLoansOnRealEstateForeclosures

us-gaap:MortgageLoansOnRealEstateForeclosures


Mortgage
Period End2020-12-312020-09-30
Value4.0920.0
Percentage of MortgageLoansOnRealEstateForeclosures100.00.0

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0570.10.6510.223-0.15313-0.965-1.35
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0570.10.6510.223-0.15313-0.965-1.35
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent

us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-917000.0-944000.0-2985000.0-543000.0-357000.0-571000.0-2124000.01023000.0871000.0
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance


Noncontrolling
Period End2021-03-312020-06-302020-03-312019-09-302019-06-302019-03-31
Value259000.0310000.0546000.056000.0168000.03000.0
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Noncontrolling
Period End2021-03-312020-06-302020-03-312019-09-302019-06-302019-03-31
Value259000.0310000.0546000.056000.0168000.03000.0
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax us-gaap:FinancialInstrument

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax

us-gaap:DebtSecurities


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value84-171.9528253350-244.3618.52847
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value49-106.2644428173-112.4032.851-2.56998
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax us-gaap:FinancialInstrument

us-gaap:DebtSecurities


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value49-106.2644428173-112.4032.851-2.569
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax us-gaap:FinancialInstrument

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

us-gaap:DebtSecurities


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value13-27.796116.41849-31.4810.194-0.016
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax


Other
Period End2021-06-302021-03-31
Value46000.065000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-09-302020-06-302020-03-312019-09-30
Value99000.0-402000.0246000.0236000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax0.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-2.322-3.80917-1.851-1.849-1.756-11.13-1.454-1.495
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax


Other
Period End2021-06-302021-03-31
Value1780000.0944000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-09-302020-06-302020-03-312019-09-30
Value-731000.0-3002000.02554000.0-164000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax0.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax


Other
Period End2021-06-302021-03-31
Value617000.01013000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-09-302020-06-302020-03-312019-09-30
Value491000.0492000.0467000.0386000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax0.00.00.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value73-132.644285-201.385
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value73-132.6446846285-201.3859.49337
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.00.00.0100.0100.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-12-312020-09-302019-12-312019-09-30
Value68469.49337
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax0.00.00.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax


Other
Period End2021-06-302021-03-31
Value-19.52135
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-09-302020-06-302020-03-312019-09-30
Value12-31.249539.963
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax0.00.00.00.0

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherCostAndExpenseOperating


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value149133129126125133133128129
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value9.867109.147109.47610109.50410
Percentage of OtherCostAndExpenseOperating6.67.97.07.97.67.97.77.48.3

anat:AnnuitySegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value121212121111121213
Percentage of OtherCostAndExpenseOperating8.69.19.79.69.48.99.39.510.3

anat:LifeSegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value494745454447474646
Percentage of OtherCostAndExpenseOperating32.835.234.935.735.635.535.736.536.0

anat:PropertyAndCasualtySegment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value505350485053495049
Percentage of OtherCostAndExpenseOperating33.840.439.138.440.039.637.539.038.4

us-gaap:CorporateAndOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value279.78611109.3710139.759.127
Percentage of OtherCostAndExpenseOperating18.27.39.28.47.58.29.87.67.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense us-gaap:StatementBusinessSegments

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

anat:PropertyAndCasualtyAccidentAndHealth


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value281260251293264270270304
Percentage of PaymentsForLossesAndLossAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value332000.02356000.0-5473000.0-1506000.08722000.0-4400000.0-6512000.0-2460000.0
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromShortTermInvestments

us-gaap:PaymentsForProceedsFromShortTermInvestments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-294.76118322729982-6.439-1.677-198.235
Percentage of PaymentsForProceedsFromShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value86321044518758925069102
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireHeldToMaturitySecurities

us-gaap:PaymentsToAcquireHeldToMaturitySecurities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value28156014714-8.974345347473
Percentage of PaymentsToAcquireHeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value100661475986576783
Percentage of PaymentsToAcquireInterestInSubsidiariesAndAffiliates100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireMortgageNotesReceivable

us-gaap:PaymentsToAcquireMortgageNotesReceivable


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value109157285139159166365135
Percentage of PaymentsToAcquireMortgageNotesReceivable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireOtherInvestments

us-gaap:PaymentsToAcquireOtherInvestments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value462214373610627.453
Percentage of PaymentsToAcquireOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired

us-gaap:PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired


Payments
Period End2021-06-302021-03-312020-06-302020-03-31
Value30281824
Percentage of PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired100.0100.0100.0100.0

us-gaap:PaymentsToAcquireRealEstateHeldForInvestment

us-gaap:PaymentsToAcquireRealEstateHeldForInvestment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value2.3792.91195.1923.6793.3611.9452.698
Percentage of PaymentsToAcquireRealEstateHeldForInvestment100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToFundPolicyLoans

us-gaap:PaymentsToFundPolicyLoans


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value4.1995.095.1424.3836.2936.527.7877.902
Percentage of PaymentsToFundPolicyLoans100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PolicyholderBenefitsAndClaimsIncurredHealthCare

us-gaap:PolicyholderBenefitsAndClaimsIncurredHealthCare


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value262426272634272826
Percentage of PolicyholderBenefitsAndClaimsIncurredHealthCare100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromCollectionOfPolicyLoans

us-gaap:ProceedsFromCollectionOfPolicyLoans


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1315121413121410
Percentage of ProceedsFromCollectionOfPolicyLoans100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromDistributionsReceivedFromRealEstatePartnerships

us-gaap:ProceedsFromDistributionsReceivedFromRealEstatePartnerships


Proceeds
Period End2021-06-302021-03-312020-06-302020-03-31
Value40400.4413.994
Percentage of ProceedsFromDistributionsReceivedFromRealEstatePartnerships100.0100.0100.0100.0

us-gaap:ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates

us-gaap:ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value27303412197.7171340
Percentage of ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value277446448477328360362202
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsToMinorityShareholders

us-gaap:ProceedsFromPaymentsToMinorityShareholders


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-339000.0-380000.0191000.0-87000.0-362000.0-323000.0756000.0-18435000.0
Percentage of ProceedsFromPaymentsToMinorityShareholders100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfNotesPayable

us-gaap:ProceedsFromRepaymentsOfNotesPayable


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-1.109-1.096-1.085-1.083-1.072-1.054-1.046-0.534
Percentage of ProceedsFromRepaymentsOfNotesPayable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndCollectionOfMortgageNotesReceivable

us-gaap:ProceedsFromSaleAndCollectionOfMortgageNotesReceivable


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value24026720914858105211220
Percentage of ProceedsFromSaleAndCollectionOfMortgageNotesReceivable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value324249173302226274171164
Percentage of ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value7338494322326712
Percentage of ProceedsFromSaleAndMaturityOfOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value13110.032854629140.0
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt100.0100.00.0100.0100.0100.0100.0100.00.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value54000.011000.0252000.0000
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment100.0100.0100.00.00.00.0

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.01115431.4310.9642.26657
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment0.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanAndLeaseLosses us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ProvisionForLoanAndLeaseLosses

us-gaap:CommercialLoan


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-17.630.885121.4365229
Percentage of ProvisionForLoanAndLeaseLosses100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax


Reclassification
Period End2021-06-302021-03-312020-06-302020-03-31
Value4.374-0.2569.444-11.362
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-2.322-3.8091.625-1.851-1.849-1.756-1.242-1.454
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax-53.11487.90.00.0-19.615.50.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value6.6963.5533.4362.74711-9.6062.310.616
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax153.1-1387.90.00.0119.684.50.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Reclassification
Period End2020-12-312020-09-302019-12-312019-09-30
Value5.0610.8961.068-0.838
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax0.00.00.00.0

us-gaap:RelatedPartyTransactionAmountsOfTransaction us-gaap:IncomeStatementLocation, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RelatedPartyTransactionAmountsOfTransaction

us-gaap:OperatingExpense, anat:GreerHerzAndAdamsLlp


Related
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value3.3793.7133.3243.0333.2513.8433.0633.1293.007
Percentage of RelatedPartyTransactionAmountsOfTransaction100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-31
Value0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.0

us-gaap:StatutoryAccountingPracticesPermittedPracticeAmount dei:LegalEntity, us-gaap:StatementGeographical

us-gaap:StatutoryAccountingPracticesPermittedPracticeAmount

anat:InsuranceSubsidiary, stpr:MO


Statutory
Period End2021-06-302021-03-312020-12-312020-09-30
Value-4.1652.2162.542
Percentage of StatutoryAccountingPracticesPermittedPracticeAmount100.0100.0100.0100.0

us-gaap:StatutoryAccountingPracticesStatutoryNetIncomeAmount us-gaap:StatementBusinessSegments

us-gaap:StatutoryAccountingPracticesStatutoryNetIncomeAmount

anat:LifeSegment


Statutory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-18.958-32.217-38.214-11.638-28.30152142612
Percentage of StatutoryAccountingPracticesStatutoryNetIncomeAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0

anat:PropertyAndCasualtySegment


Statutory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value17395833-12.97548301512
Percentage of StatutoryAccountingPracticesStatutoryNetIncomeAmount-94.3-121.9-152.1-290.645.891.1202.059.096.6

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense us-gaap:StatementBusinessSegments

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

anat:PropertyAndCasualtyAccidentAndHealth


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value317300272303341260290325
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense us-gaap:StatementBusinessSegments

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense

anat:PropertyAndCasualtyAccidentAndHealth


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-15584000.0-31127000.0-8569000.0-19834000.0-37428000.04172000.0-10931000.0-16357000.0
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockRetiredParValueMethodAmount us-gaap:StatementEquityComponents

us-gaap:TreasuryStockRetiredParValueMethodAmount

us-gaap:CommonStock


Treasury
Period End2020-09-30
Value3.945
Percentage of TreasuryStockRetiredParValueMethodAmount100.0

us-gaap:RetainedEarnings


Treasury
Period End2020-09-30
Value104
Percentage of TreasuryStockRetiredParValueMethodAmount2649.5

us-gaap:TreasuryStock


Treasury
Period End2020-09-30
Value-108.469
Percentage of TreasuryStockRetiredParValueMethodAmount-2749.5

us-gaap:UnrealizedGainLossOnInvestments

us-gaap:UnrealizedGainLossOnInvestments


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-30
Value25-5.486-1.44-4.175-52.31-44.6780.0
Percentage of UnrealizedGainLossOnInvestments100.0100.0100.0100.0100.0100.00.0

us-gaap:UnrealizedGainLossOnInvestments us-gaap:StatementBusinessSegments

us-gaap:CorporateAndOther


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value25-5.486-1.44-4.175-52.31-44.678
Percentage of UnrealizedGainLossOnInvestments100.0100.0100.0100.0100.0100.0

us-gaap:WithdrawalFromContractHoldersFunds

us-gaap:WithdrawalFromContractHoldersFunds


Withdrawal
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value316323361371344310354349
Percentage of WithdrawalFromContractHoldersFunds100.0100.0100.0100.0100.0100.0100.0100.0

anat:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax

anat:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax


Accumulated
Period End2020-12-312019-12-31
Value-17846000.0-14683000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax100.0100.0

anat:AdvancesFromFederalHomeLoanBanksFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

anat:AdvancesFromFederalHomeLoanBanksFairValueDisclosure

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsNonrecurring


Advances
Period End2021-03-312020-12-31
Value250250
Percentage of AdvancesFromFederalHomeLoanBanksFairValueDisclosure100.0100.0

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesAllowanceForCreditLosses

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesAllowanceForCreditLosses


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value22271929
Percentage of AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesAllowanceForCreditLosses100.0100.0100.0100.0

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesCost

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesCost


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value151201454114440145181503915066
Percentage of AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesCost100.0100.0100.0100.0100.0100.0

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesFairValue

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value160661530615580154841588415693
Percentage of AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesFairValue100.0100.0100.0100.0100.0100.0

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedGains

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedGains


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value99388011881067944647
Percentage of AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedGains100.0100.0100.0100.0100.0100.0

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedLosses

anat:AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedLosses


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value258828717321
Percentage of AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedLosses100.0100.0100.0100.0100.0100.0

anat:DebtSecuritiesHeldToMaturityNetOfAllowanceForCreditLoss

anat:DebtSecuritiesHeldToMaturityNetOfAllowanceForCreditLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value747374757354770282388631
Percentage of DebtSecuritiesHeldToMaturityNetOfAllowanceForCreditLoss100.0100.0100.0100.0100.0100.0

anat:DeferredTaxAssetsTaxDeferredExpenseParticipatingPolicyholdersSurplus

anat:DeferredTaxAssetsTaxDeferredExpenseParticipatingPolicyholdersSurplus


Deferred
Period End2020-12-312019-12-31
Value4141
Percentage of DeferredTaxAssetsTaxDeferredExpenseParticipatingPolicyholdersSurplus100.0100.0

anat:DeferredTaxLiabilitiesPension

anat:DeferredTaxLiabilitiesPension


Deferred
Period End2020-12-312019-12-31
Value1549000.01833000.0
Percentage of DeferredTaxLiabilitiesPension100.0100.0

anat:FederalHomeLoanBankAdvancesAdditionalBorrowingCapacity

anat:FederalHomeLoanBankAdvancesAdditionalBorrowingCapacity


Federal
Period End2021-06-302021-03-312020-09-30
Value1100740564
Percentage of FederalHomeLoanBankAdvancesAdditionalBorrowingCapacity100.0100.0100.0

anat:FederalHomeLoanBankAdvancesAdditionalBorrowingCapacity us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Federal
Period End2021-02-22
Value775
Percentage of FederalHomeLoanBankAdvancesAdditionalBorrowingCapacity0.0

anat:FinancingReceivableDeferredInterestNetCOVID19

anat:FinancingReceivableDeferredInterestNetCOVID19


Financing
Period End2021-06-302021-03-312020-12-31
Value131718
Percentage of FinancingReceivableDeferredInterestNetCOVID19100.0100.0100.0

anat:FinancingReceivableModifiedCOVID19

anat:FinancingReceivableModifiedCOVID19


Financing
Period End2021-06-302021-03-312020-12-302020-09-30
Value7086332301600
Percentage of FinancingReceivableModifiedCOVID19100.0100.0100.0100.0

anat:FinancingReceivableModifiedCOVID19 us-gaap:FinancingReceivablesPeriodPastDue

us-gaap:FinancingReceivables60To89DaysPastDue


Financing
Period End2020-12-312020-09-30
Value6045
Percentage of FinancingReceivableModifiedCOVID190.02.8

us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDue


Financing
Period End2020-12-31
Value25
Percentage of FinancingReceivableModifiedCOVID190.0

anat:FinancingReceivableUnderModificationsCOVID19 us-gaap:SubsequentEventType

anat:FinancingReceivableUnderModificationsCOVID19

us-gaap:SubsequentEvent


Financing
Period End2020-07-29
Value434
Percentage of FinancingReceivableUnderModificationsCOVID19100.0

anat:FinancingReceivableUnderModificationsNumberOfContractsCOVID19 us-gaap:SubsequentEventType

anat:FinancingReceivableUnderModificationsNumberOfContractsCOVID19

us-gaap:SubsequentEvent


Financing
Period End2020-07-29
Value28.0
Percentage of FinancingReceivableUnderModificationsNumberOfContractsCOVID19100.0

anat:InsuranceLinesOtherThanShortDuration

anat:InsuranceLinesOtherThanShortDuration


Insurance
Period End2020-12-31
Value229
Percentage of InsuranceLinesOtherThanShortDuration100.0

anat:InvestmentsExcludingEquityMethodInvestments

anat:InvestmentsExcludingEquityMethodInvestments


Investments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value258182531624278237482382023587
Percentage of InvestmentsExcludingEquityMethodInvestments100.0100.0100.0100.0100.0100.0

anat:LiabilitiesRelatedtoInvestmentContractsCarryingAmount us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

anat:LiabilitiesRelatedtoInvestmentContractsCarryingAmount

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value105531023510101101671018510254
Percentage of LiabilitiesRelatedtoInvestmentContractsCarryingAmount100.0100.0100.0100.0100.0100.0

anat:LoansGrossInsurancePolicyFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

anat:LoansGrossInsurancePolicyFairValue

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring


Loans
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value365369373374377379
Percentage of LoansGrossInsurancePolicyFairValue100.0100.0100.0100.0100.0100.0

anat:LoansReceivableCommercialRealEstatePercentage us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

anat:LoansReceivableCommercialRealEstatePercentage

anat:StorageBuilding


Loans
Period End2021-06-302021-03-312020-12-312019-12-31
Value2.72.93.12.9
Percentage of LoansReceivableCommercialRealEstatePercentage100.0100.0100.0100.0

srt:ApartmentBuilding


Loans
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value10.310.510.58.90.0850.081
Percentage of LoansReceivableCommercialRealEstatePercentage381.5362.1338.70.00.02.8

srt:Hotel


Loans
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value17.717.017.017.10.1710.176
Percentage of LoansReceivableCommercialRealEstatePercentage655.6586.2548.40.00.06.1

srt:IndustrialProperty


Loans
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value16.615.915.914.70.1370.119
Percentage of LoansReceivableCommercialRealEstatePercentage614.8548.3512.90.00.04.1

srt:OfficeBuilding


Loans
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value28.729.329.029.50.2960.315
Percentage of LoansReceivableCommercialRealEstatePercentage1063.01010.3935.50.00.010.9

srt:OtherProperty


Loans
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value2.22.63.014.60.1470.143
Percentage of LoansReceivableCommercialRealEstatePercentage81.589.796.80.00.04.9

srt:RetailSite


Loans
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value14.714.914.715.20.1640.166
Percentage of LoansReceivableCommercialRealEstatePercentage544.4513.8474.20.00.05.7

us-gaap:Parking


Loans
Period End2021-06-302021-03-312020-12-312019-12-31
Value7.16.96.85.6
Percentage of LoansReceivableCommercialRealEstatePercentage263.0237.9219.4193.1

anat:MaximumAmountOfInvestmentInLongTermNotesPayable

anat:MaximumAmountOfInvestmentInLongTermNotesPayable


Maximum
Period End2021-06-302021-03-312020-12-312020-06-302019-12-31
Value3000000.02900000.03000000.03066000.04304000.0
Percentage of MaximumAmountOfInvestmentInLongTermNotesPayable100.0100.0100.0100.0100.0

anat:MortgageLoansOnRealEstateCommercialAndConsumerNetOfAllowanceForCreditLosses

anat:MortgageLoansOnRealEstateCommercialAndConsumerNetOfAllowanceForCreditLosses


Mortgage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value502851415242517651765097
Percentage of MortgageLoansOnRealEstateCommercialAndConsumerNetOfAllowanceForCreditLosses100.0100.0100.0100.0100.0100.0

anat:PrepaidPension

anat:PrepaidPension


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value878480878478
Percentage of PrepaidPension100.0100.0100.0100.0100.0100.0

anat:RealEstateInvestmentPropertyNetAndRealEstatePartnerships

anat:RealEstateInvestmentPropertyNetAndRealEstatePartnerships


Real
Period End2021-06-302021-03-312020-12-31
Value926938960
Percentage of RealEstateInvestmentPropertyNetAndRealEstatePartnerships100.0100.0100.0

anat:RealEstateInvestmentPropertyNetAndRealEstatePartnerships us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Real
Period End2021-06-302021-03-312020-12-31
Value129130131
Percentage of RealEstateInvestmentPropertyNetAndRealEstatePartnerships14.013.913.7

anat:SeparatelyManagedAccounts us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

anat:SeparatelyManagedAccounts

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Separately
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value776664625150
Percentage of SeparatelyManagedAccounts100.0100.0100.0100.0100.0100.0

anat:SeparatelyManagedAccounts us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, anat:InvestmentsOfVariableInsuranceProductContractHolders, us-gaap:ValuationTechniqueDiscountedCashFlow


Separately
Period End2021-06-302020-12-31
Value7764
Percentage of SeparatelyManagedAccounts100.0100.0

anat:SeparatelyManagedAccounts us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Separately
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value776664625150
Percentage of SeparatelyManagedAccounts100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Separately
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value776664625150
Percentage of SeparatelyManagedAccounts100.0100.0100.0100.0100.0100.0

anat:SeparatelyManagedAccounts us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Separately
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value776664625150
Percentage of SeparatelyManagedAccounts100.0100.0100.0100.0100.0100.0

anat:SeparatelyManagedAccountsMeasurementInput us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

anat:SeparatelyManagedAccountsMeasurementInput

srt:Maximum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, anat:InvestmentsOfVariableInsuranceProductContractHolders, us-gaap:MeasurementInputDiscountRate, us-gaap:ValuationTechniqueDiscountedCashFlow


Separately
Period End2021-06-302020-12-31
Value101.9514.71
Percentage of SeparatelyManagedAccountsMeasurementInput100.0100.0

srt:Minimum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, anat:InvestmentsOfVariableInsuranceProductContractHolders, us-gaap:MeasurementInputDiscountRate, us-gaap:ValuationTechniqueDiscountedCashFlow


Separately
Period End2021-06-302020-12-31
Value6.597.25
Percentage of SeparatelyManagedAccountsMeasurementInput6.549.3

anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfLiabilityComponentOfAward us-gaap:AwardType

anat:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfLiabilityComponentOfAward

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value1500000.0890000.0793000.0557000.00971000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfLiabilityComponentOfAward100.0100.0100.0100.00.0100.0

anat:SignificantUnobservableInputsEquityVolatilityRate us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass

anat:SignificantUnobservableInputsEquityVolatilityRate

srt:Maximum, anat:PolicyholderContractDeposits, us-gaap:FairValueInputsLevel3, anat:IndexedAnnuities


Significant
Period End2020-12-312020-06-302019-12-31
Value69.00.650.46
Percentage of SignificantUnobservableInputsEquityVolatilityRate100.0100.0100.0

srt:Maximum, anat:PolicyholderContractDeposits, us-gaap:FairValueInputsLevel3, anat:IndexedLife


Significant
Period End2020-12-312020-06-302019-12-31
Value69.00.650.46
Percentage of SignificantUnobservableInputsEquityVolatilityRate100.0100.0100.0

srt:Minimum, anat:PolicyholderContractDeposits, us-gaap:FairValueInputsLevel3, anat:IndexedAnnuities


Significant
Period End2020-12-312020-06-302019-12-31
Value16.00.160.11
Percentage of SignificantUnobservableInputsEquityVolatilityRate23.224.623.9

srt:Minimum, anat:PolicyholderContractDeposits, us-gaap:FairValueInputsLevel3, anat:IndexedLife


Significant
Period End2020-12-312020-06-302019-12-31
Value16.00.160.11
Percentage of SignificantUnobservableInputsEquityVolatilityRate23.224.623.9

anat:SignificantUnobservableInputsLapseRate us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass

anat:SignificantUnobservableInputsLapseRate

srt:Maximum, anat:PolicyholderContractDeposits, us-gaap:FairValueInputsLevel3, anat:IndexedAnnuities


Significant
Period End2020-12-312020-06-302019-12-31
Value50.00.70.7
Percentage of SignificantUnobservableInputsLapseRate100.0100.0100.0

srt:Minimum, anat:PolicyholderContractDeposits, us-gaap:FairValueInputsLevel3, anat:IndexedAnnuities


Significant
Period End2020-12-312020-06-302019-12-31
Value1.00.010.01
Percentage of SignificantUnobservableInputsLapseRate2.01.41.4

srt:LifeInsuranceInForceAssumed

srt:LifeInsuranceInForceAssumed


Life
Period End2020-12-312019-12-312018-12-31
Value171218230
Percentage of LifeInsuranceInForceAssumed100.0100.0100.0

srt:LifeInsuranceInForceCeded

srt:LifeInsuranceInForceCeded


Life
Period End2020-12-312019-12-312018-12-31
Value240062491326601
Percentage of LifeInsuranceInForceCeded100.0100.0100.0

srt:LifeInsuranceInForceGross

srt:LifeInsuranceInForceGross


Life
Period End2020-12-312019-12-312018-12-31
Value128075117886110125
Percentage of LifeInsuranceInForceGross100.0100.0100.0

srt:LifeInsuranceInForceNet

srt:LifeInsuranceInForceNet


Life
Period End2020-12-312019-12-312018-12-31
Value1042409319083754
Percentage of LifeInsuranceInForceNet100.0100.0100.0

srt:LifeInsuranceInForcePercentageAssumedToNet

srt:LifeInsuranceInForcePercentageAssumedToNet


Life
Period End2020-12-312019-12-312018-12-31
Value0.20.20.3
Percentage of LifeInsuranceInForcePercentageAssumedToNet100.0100.0100.0

us-gaap:AccruedInvestmentIncomeReceivable

us-gaap:AccruedInvestmentIncomeReceivable


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value206213216211211200
Percentage of AccruedInvestmentIncomeReceivable100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax


Accumulated
Period End2020-12-312019-12-31
Value6755
Percentage of AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax100.0100.0

us-gaap:AdditionalCollateralAggregateFairValue

us-gaap:AdditionalCollateralAggregateFairValue


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value2886000.01878000.03852000.03600000.07912000.02008000.0
Percentage of AdditionalCollateralAggregateFairValue100.0100.0100.0100.0100.0100.0

us-gaap:AdditionalCollateralAggregateFairValue us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors

anat:Barclays, srt:MoodysBaa2Rating, srt:StandardPoorsBBBRating


Additional
Period End2020-12-312020-09-302020-06-30
Value1876000.0494000.0902000.0
Percentage of AdditionalCollateralAggregateFairValue48.713.711.4

anat:CreditSuisse, srt:MoodysBaa1Rating, srt:StandardPoorsBBBPlusRating


Additional
Period End2021-06-302021-03-312020-12-31
Value876000.0836000.0767000.0
Percentage of AdditionalCollateralAggregateFairValue30.444.519.9

anat:CreditSuisse, srt:MoodysBaa2Rating, srt:StandardPoorsBBBPlusRating


Additional
Period End2020-09-302020-06-302019-12-31
Value266000.0476000.0108000.0
Percentage of AdditionalCollateralAggregateFairValue7.46.05.4

anat:GoldmanSachs, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Additional
Period End2021-03-31
Value115000.0
Percentage of AdditionalCollateralAggregateFairValue6.1

anat:GoldmanSachs, srt:MoodysA3Rating, srt:StandardPoorsBBBPlusRating


Additional
Period End2020-12-312020-09-302020-06-302019-12-31
Value57000.0185000.080000.0123000.0
Percentage of AdditionalCollateralAggregateFairValue1.55.11.06.1

anat:ING, srt:MoodysBaa1Rating, srt:StandardPoorsAMinusRating


Additional
Period End2021-06-302021-03-312020-06-302019-12-31
Value95000.048000.000
Percentage of AdditionalCollateralAggregateFairValue3.32.60.00.0

anat:MorganStanley, srt:MoodysA1Rating, srt:StandardPoorsBBBPlusRating


Additional
Period End2021-06-302021-03-31
Value1739000.0574000.0
Percentage of AdditionalCollateralAggregateFairValue60.330.6

anat:MorganStanley, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Additional
Period End2020-12-31
Value1090000.0
Percentage of AdditionalCollateralAggregateFairValue28.3

anat:MorganStanley, srt:MoodysA3Rating, srt:StandardPoorsBBBPlusRating


Additional
Period End2020-09-302020-06-302019-12-31
Value1006000.03011000.062000.0
Percentage of AdditionalCollateralAggregateFairValue27.938.13.1

anat:SunTrustBank, srt:MoodysA3Rating, srt:StandardPoorsAMinusRating


Additional
Period End2020-09-302020-06-302019-12-31
Value858000.01790000.01715000.0
Percentage of AdditionalCollateralAggregateFairValue23.822.685.4

anat:WellsFargo, srt:MoodysA2Rating, srt:StandardPoorsAMinusRating


Additional
Period End2020-09-302020-06-302019-12-31
Value791000.01389000.00
Percentage of AdditionalCollateralAggregateFairValue22.017.60.0

anat:WellsFargo, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Additional
Period End2021-06-302021-03-312020-12-31
Value176000.0305000.062000.0
Percentage of AdditionalCollateralAggregateFairValue6.116.21.6

us-gaap:AdvancesFromFederalHomeLoanBanks

us-gaap:AdvancesFromFederalHomeLoanBanks


Advances
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value2502505005000.0
Percentage of AdvancesFromFederalHomeLoanBanks100.0100.0100.0100.00.0

us-gaap:AdvancesFromFederalHomeLoanBanks us-gaap:DebtInstrument, us-gaap:LongtermDebtType

anat:FederalHomeLoanBankAdvancesMaturityDateApril282021, us-gaap:FederalHomeLoanBankAdvances


Advances
Period End2021-03-312020-12-312020-09-302020-06-30
Value2500.25250250
Percentage of AdvancesFromFederalHomeLoanBanks100.00.150.050.0

anat:FederalHomeLoanBankAdvancesMaturityDateOctober132020, us-gaap:FederalHomeLoanBankAdvances


Advances
Period End2020-09-302020-06-302020-04-282020-04-13
Value250250245240
Percentage of AdvancesFromFederalHomeLoanBanks50.050.00.00.0

us-gaap:AdvancesFromFederalHomeLoanBanks us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Advances
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value2502505005000.0
Percentage of AdvancesFromFederalHomeLoanBanks100.0100.0100.0100.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Advances
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value2502505005000.0
Percentage of AdvancesFromFederalHomeLoanBanks100.0100.1100.0100.00.0

us-gaap:AlternativeInvestment

us-gaap:AlternativeInvestment


Alternative
Period End2021-06-302021-03-312020-12-31
Value594523477
Percentage of AlternativeInvestment100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value271125112379211518671972
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value971893109359870584197883
Percentage of AssetsFairValueDisclosure358.4370.7393.4411.4450.8399.8

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value475448418394347351
Percentage of AssetsFairValueDisclosure17.517.917.618.718.617.8

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value258052528825158244992445424339
Percentage of AssetsFairValueDisclosure951.71007.01057.51157.91309.31234.2

us-gaap:EstimateOfFairValueFairValueDisclosure


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value266112584525995252502519124889
Percentage of AssetsFairValueDisclosure981.51029.11092.71193.41348.71262.1

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value136741354313807140041452914657
Percentage of AssetsFairValueDisclosure504.3539.3580.4661.9777.9743.2

us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value129061227012156112161063410207
Percentage of AssetsFairValueDisclosure476.0488.6511.0530.1569.4517.6

us-gaap:AssetsHeldByInsuranceRegulators

us-gaap:AssetsHeldByInsuranceRegulators


Assets
Period End2021-06-302021-03-312020-12-312019-12-31
Value47474748
Percentage of AssetsHeldByInsuranceRegulators100.0100.0100.0100.0

us-gaap:AssetsNet us-gaap:BalanceSheetLocation, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:AssetsNet

anat:AccruedInvestmentIncome, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Assets
Period End2020-09-302020-06-302019-12-31
Value5.1543.2762.198
Percentage of AssetsNet100.0100.0100.0

anat:InvestmentsInUnconsolidatedAffiliates, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Assets
Period End2020-09-302020-06-302019-12-31
Value347342332
Percentage of AssetsNet6743.410469.115138.4

us-gaap:AssetsNet us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, anat:AccruedInvestmentIncome


Assets
Period End2021-06-302021-03-312020-12-312019-12-31
Value4.0084.6924.982.198
Percentage of AssetsNet0.00.00.0100.0

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, anat:InvestmentsInUnconsolidatedAffiliates


Assets
Period End2021-06-302021-03-312020-12-312019-12-31
Value338349368332
Percentage of AssetsNet0.00.00.015138.4

us-gaap:AssetsNet us-gaap:ConsolidatedEntities, us-gaap:InvestmentType

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, us-gaap:Mortgages


Assets
Period End2021-06-302021-03-312020-12-312019-12-31
Value680691722657
Percentage of AssetsNet0.00.00.029914.8

us-gaap:AssetsNet us-gaap:InvestmentType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:Mortgages, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Assets
Period End2020-09-302020-06-302019-12-31
Value721696657
Percentage of AssetsNet14006.621265.129914.8

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value456406548484433302
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.9130.6711.040.8920.7510.686
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.20.20.20.20.20.2

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value391344471410362251
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax85.884.985.884.783.583.1

us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value1.071.1821.3931.6021.7821.287
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.20.30.30.30.40.4

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.7050.6750.9641.2561.2310.739
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.20.20.20.30.30.2

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value615873696747
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax13.514.413.514.415.515.8

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.2480.2980.4180.5430.6760.441
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.10.10.10.10.20.1

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value124617353813
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.2750.2020.0940.0640.0770.001
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax2.20.40.50.20.20.0

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value104217353812
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax85.790.198.599.599.798.3

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.0570.0080.0290.070.0230.201
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.50.00.20.20.11.5

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value1.3984.4160.1450.0370.00.009
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax11.49.40.80.10.00.1

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.0180.030.0010.0010.00.005
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.10.10.00.00.00.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value763070467073679467796435
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value137645427279.444
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.80.90.80.40.40.1

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value639758685887566456535338
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis83.883.383.283.483.482.9

us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value5.0141414145.0
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.10.20.20.20.20.1

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value321920262923
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.40.30.30.40.40.4

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value103310541066102810251030
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis13.515.015.115.115.116.0

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value232528322929
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.30.40.40.50.40.5

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value2619230922952307
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value2785244225172504
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value3157325332593230
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value3373345634813410
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value148011131101887
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value153311241176947
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value372371416368
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value375374421374
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value806873977597723671706725
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-06-302019-12-31
Value24250.00.0
Percentage of AvailableForSaleSecuritiesDebtSecurities0.30.30.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value791172467486711770666680
Percentage of AvailableForSaleSecuritiesDebtSecurities98.198.098.598.498.699.3

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value13312611011810344
Percentage of AvailableForSaleSecuritiesDebtSecurities1.71.71.51.61.40.7

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-06-302019-12-31
Value24250.00.0
Percentage of AvailableForSaleSecuritiesDebtSecurities0.30.30.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CollateralizedDebtObligations


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value1376455282710
Percentage of AvailableForSaleSecuritiesDebtSecurities1.70.90.70.40.40.2

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value664060376224591358695531
Percentage of AvailableForSaleSecuritiesDebtSecurities82.381.681.981.781.982.3

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value6.07161616166.287
Percentage of AvailableForSaleSecuritiesDebtSecurities0.10.20.20.20.20.1

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value321921273023
Percentage of AvailableForSaleSecuritiesDebtSecurities0.40.30.30.40.40.4

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value109311081140109810921078
Percentage of AvailableForSaleSecuritiesDebtSecurities13.615.015.015.215.216.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment


Available
Period End2020-12-312020-09-302020-06-302019-12-31
Value29322929
Percentage of AvailableForSaleSecuritiesDebtSecurities0.40.40.40.4

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value13312611011810344
Percentage of AvailableForSaleSecuritiesDebtSecurities1.71.71.51.61.40.7

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

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities, anat:ValuationTechniquePricedAtCost


Available
Period End2021-06-302020-12-31
Value133110
Percentage of AvailableForSaleSecuritiesDebtSecurities1.71.5

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value806873977597723671706725
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value806873977597723671706725
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value806873977597723671706725
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:CollateralizedDebtObligations


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value1376455282710
Percentage of AvailableForSaleSecuritiesDebtSecurities1.70.90.70.40.40.2

us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value677461636334603259735576
Percentage of AvailableForSaleSecuritiesDebtSecurities84.083.383.483.483.382.9

us-gaap:FairValueMeasurementsRecurring, us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value6.07161616166.287
Percentage of AvailableForSaleSecuritiesDebtSecurities0.10.20.20.20.20.1

us-gaap:FairValueMeasurementsRecurring, us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value321921273023
Percentage of AvailableForSaleSecuritiesDebtSecurities0.40.30.30.40.40.4

us-gaap:FairValueMeasurementsRecurring, us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value109311081140109810921078
Percentage of AvailableForSaleSecuritiesDebtSecurities13.615.015.015.215.216.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value242529322929
Percentage of AvailableForSaleSecuritiesDebtSecurities0.30.30.40.40.40.4

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value1376455282710
Percentage of AvailableForSaleSecuritiesDebtSecurities1.70.90.70.40.40.2

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value677461636334603259735576
Percentage of AvailableForSaleSecuritiesDebtSecurities84.083.383.483.483.382.9

us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value6.07161616166.287
Percentage of AvailableForSaleSecuritiesDebtSecurities0.10.20.20.20.20.1

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value321921273023
Percentage of AvailableForSaleSecuritiesDebtSecurities0.40.30.30.40.40.4

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value109311081140109810921078
Percentage of AvailableForSaleSecuritiesDebtSecurities13.615.015.015.215.216.0

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value242529322929
Percentage of AvailableForSaleSecuritiesDebtSecurities0.30.30.40.40.40.4

us-gaap:BusinessAcquisitionSharePrice dei:LegalEntity, us-gaap:StatementScenario, us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

us-gaap:BusinessAcquisitionSharePrice

anat:BrookfieldAssetManagementReinsurancePartnersLtd, srt:ScenarioForecast, anat:AmericanNationalGroupInc, us-gaap:SubsequentEvent


Business
Period End2022-06-30
Value190.0
Percentage of BusinessAcquisitionSharePrice100.0

us-gaap:CollateralAlreadyPostedAggregateFairValue

us-gaap:CollateralAlreadyPostedAggregateFairValue


Collateral
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value257251238210183253
Percentage of CollateralAlreadyPostedAggregateFairValue100.0100.0100.0100.0100.0100.0

us-gaap:CollateralAlreadyPostedAggregateFairValue us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors

anat:Barclays, srt:MoodysBaa2Rating, srt:StandardPoorsBBBRating


Collateral
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value4854494235
Percentage of CollateralAlreadyPostedAggregateFairValue18.921.720.820.019.3

anat:CreditSuisse, srt:MoodysBaa1Rating, srt:StandardPoorsBBBPlusRating


Collateral
Period End2021-06-302021-03-312020-12-31
Value25128.68
Percentage of CollateralAlreadyPostedAggregateFairValue9.95.03.6

anat:CreditSuisse, srt:MoodysBaa2Rating, srt:StandardPoorsBBBPlusRating


Collateral
Period End2020-09-302020-06-302019-12-31
Value7.674.477.009
Percentage of CollateralAlreadyPostedAggregateFairValue3.62.42.8

anat:GoldmanSachs, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Collateral
Period End2021-03-31
Value1.17
Percentage of CollateralAlreadyPostedAggregateFairValue0.5

anat:GoldmanSachs, srt:MoodysA3Rating, srt:StandardPoorsBBBPlusRating


Collateral
Period End2020-12-312020-09-302020-06-302019-12-31
Value1.170.910.910.93
Percentage of CollateralAlreadyPostedAggregateFairValue0.50.40.50.4

anat:ING, srt:MoodysBaa1Rating, srt:StandardPoorsAMinusRating


Collateral
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value161920202430
Percentage of CollateralAlreadyPostedAggregateFairValue6.57.88.69.913.211.9

anat:MorganStanley, srt:MoodysA1Rating, srt:StandardPoorsBBBPlusRating


Collateral
Period End2021-06-302021-03-31
Value6550
Percentage of CollateralAlreadyPostedAggregateFairValue25.320.0

anat:MorganStanley, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Collateral
Period End2020-12-31
Value36
Percentage of CollateralAlreadyPostedAggregateFairValue15.2

anat:MorganStanley, srt:MoodysA3Rating, srt:StandardPoorsBBBPlusRating


Collateral
Period End2020-09-302020-06-302019-12-31
Value211334
Percentage of CollateralAlreadyPostedAggregateFairValue10.17.613.8

anat:Natixis, srt:MoodysA1Rating, srt:StandardPoorsAPlusRating


Collateral
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value2930302629
Percentage of CollateralAlreadyPostedAggregateFairValue11.612.814.714.511.8

anat:Natixis, srt:MoodysA1Rating, srt:StandardPoorsARating


Collateral
Period End2021-06-30
Value27
Percentage of CollateralAlreadyPostedAggregateFairValue10.6

anat:SunTrustBank, srt:MoodysA3Rating, srt:StandardPoorsAMinusRating


Collateral
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value364452514558
Percentage of CollateralAlreadyPostedAggregateFairValue14.017.821.924.624.923.1

anat:Truist, srt:MoodysA3Rating, srt:StandardPoorsAMinusRating


Collateral
Period End2020-12-31
Value52
Percentage of CollateralAlreadyPostedAggregateFairValue21.9

anat:WellsFargo, srt:MoodysA2Rating, srt:StandardPoorsAMinusRating


Collateral
Period End2020-09-302020-06-302019-12-31
Value343237
Percentage of CollateralAlreadyPostedAggregateFairValue16.617.514.8

anat:WellsFargo, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Collateral
Period End2021-06-302021-03-312020-12-31
Value373939
Percentage of CollateralAlreadyPostedAggregateFairValue14.815.716.5

us-gaap:ContractualObligation

us-gaap:ContractualObligation


Contractual
Period End2021-06-302021-03-312020-12-312020-09-30
Value7.58.07.410
Percentage of ContractualObligation100.0100.0100.0100.0

us-gaap:CreditRiskDerivativeAssetsAtFairValue

us-gaap:CreditRiskDerivativeAssetsAtFairValue


Credit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value260253242213191256
Percentage of CreditRiskDerivativeAssetsAtFairValue100.0100.0100.0100.0100.0100.0

us-gaap:CreditRiskDerivativeAssetsAtFairValue us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors

anat:Barclays, srt:MoodysBaa2Rating, srt:StandardPoorsBBBRating


Credit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value4854514236
Percentage of CreditRiskDerivativeAssetsAtFairValue18.721.621.319.919.0

anat:CreditSuisse, srt:MoodysBaa1Rating, srt:StandardPoorsBBBPlusRating


Credit
Period End2021-06-302021-03-312020-12-31
Value26139.447
Percentage of CreditRiskDerivativeAssetsAtFairValue10.15.33.9

anat:CreditSuisse, srt:MoodysBaa2Rating, srt:StandardPoorsBBBPlusRating


Credit
Period End2020-09-302020-06-302019-12-31
Value7.9364.9467.117
Percentage of CreditRiskDerivativeAssetsAtFairValue3.72.62.8

anat:GoldmanSachs, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Credit
Period End2021-03-31
Value1.285
Percentage of CreditRiskDerivativeAssetsAtFairValue0.5

anat:GoldmanSachs, srt:MoodysA3Rating, srt:StandardPoorsBBBPlusRating


Credit
Period End2020-12-312020-09-302020-06-302019-12-31
Value1.2271.0950.991.053
Percentage of CreditRiskDerivativeAssetsAtFairValue0.50.50.50.4

anat:ING, srt:MoodysBaa1Rating, srt:StandardPoorsAMinusRating


Credit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value161920202430
Percentage of CreditRiskDerivativeAssetsAtFairValue6.57.78.59.812.711.8

anat:MorganStanley, srt:MoodysA1Rating, srt:StandardPoorsBBBPlusRating


Credit
Period End2021-06-302021-03-31
Value6650
Percentage of CreditRiskDerivativeAssetsAtFairValue25.720.1

anat:MorganStanley, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Credit
Period End2020-12-31
Value37
Percentage of CreditRiskDerivativeAssetsAtFairValue15.4

anat:MorganStanley, srt:MoodysA3Rating, srt:StandardPoorsBBBPlusRating


Credit
Period End2020-09-302020-06-302019-12-31
Value221634
Percentage of CreditRiskDerivativeAssetsAtFairValue10.48.913.7

anat:Natixis, srt:MoodysA1Rating, srt:StandardPoorsAPlusRating


Credit
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value2930302629
Percentage of CreditRiskDerivativeAssetsAtFairValue11.512.614.414.011.7

anat:Natixis, srt:MoodysA1Rating, srt:StandardPoorsARating


Credit
Period End2021-06-30
Value27
Percentage of CreditRiskDerivativeAssetsAtFairValue10.5

anat:SunTrustBank, srt:MoodysA3Rating, srt:StandardPoorsAMinusRating


Credit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value364452524760
Percentage of CreditRiskDerivativeAssetsAtFairValue13.917.621.524.624.823.6

anat:Truist, srt:MoodysA3Rating, srt:StandardPoorsAMinusRating


Credit
Period End2020-12-31
Value52
Percentage of CreditRiskDerivativeAssetsAtFairValue21.5

anat:WellsFargo, srt:MoodysA2Rating, srt:StandardPoorsAMinusRating


Credit
Period End2020-09-302020-06-302019-12-31
Value353337
Percentage of CreditRiskDerivativeAssetsAtFairValue16.717.514.7

anat:WellsFargo, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Credit
Period End2021-06-302021-03-312020-12-31
Value383939
Percentage of CreditRiskDerivativeAssetsAtFairValue14.715.716.2

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value5.1588.7167.4827.6384.115120.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss100.0100.0100.0100.0100.0100.00.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.4560.5070.0190.0070.080.2360.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss8.85.80.30.11.91.80.0

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value4.4898.0087.2757.4373.824120.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss87.091.997.297.492.997.20.0

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.2050.1980.1880.1940.2110.130.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss4.02.32.52.55.11.00.0

us-gaap:USStatesAndPoliticalSubdivisions


Debt
Period End2021-06-302020-06-30
Value0.0080.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss0.20.0

us-gaap:USTreasuryAndGovernment


Debt
Period End2021-03-312020-06-30
Value0.0030.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLoss0.00.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value3855144964141
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.1560.1580.1570.1560.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger0.31.10.30.20.0

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value3754134953132
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger98.698.794.698.582.493.6

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.5520.5660.5930.613110.722
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger1.41.04.21.217.30.5

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.227108.70912127.735
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.0020.0010.0020.0030.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.00.00.00.00.0

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.225108.712127.538
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss99.199.999.9100.099.897.5

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-06-302019-12-31
Value0.0020.0070.0080.0230.192
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.90.10.10.22.5

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value814874297556488107
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value10839128.0089.4110.159
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months13.34.54.31.41.90.1

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value63773827053347994
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months78.284.590.995.898.188.7

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value130.2451.3917.00.010
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months1.60.00.51.30.09.5

us-gaap:USStatesAndPoliticalSubdivisions


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value4383105.4841.733
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months5.49.63.41.01.6

us-gaap:USTreasuryAndGovernment


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value11122.8682.8680.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months1.41.41.00.50.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value12368.76723255.276
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.2750.20.0930.0620.0740.001
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss2.30.51.10.30.30.0

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value10318.50722255.257
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss85.587.297.099.399.799.6

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.0550.0010.0210.070.00.009
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss0.50.00.20.30.00.2

us-gaap:USStatesAndPoliticalSubdivisions


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value1.3984.4160.1450.0370.009
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss11.612.11.70.20.2

us-gaap:USTreasuryAndGovernment


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.0180.030.0010.0010.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss0.10.10.00.00.0

us-gaap:DebtSecuritiesAvailableForSaleMeasurementInput us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

us-gaap:DebtSecuritiesAvailableForSaleMeasurementInput

srt:Minimum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities, anat:MeasurementInputCouponRate, anat:ValuationTechniquePricedAtCost


Debt
Period End2021-06-302020-12-31
Value2.72.72
Percentage of DebtSecuritiesAvailableForSaleMeasurementInput100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value853929311606553248
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value10839128.1659.5670.159
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition12.74.24.11.31.70.1

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value675793283582532227
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition79.285.491.096.096.391.5

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value130.8111.9847.6131110
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition1.60.10.61.32.04.4

us-gaap:USStatesAndPoliticalSubdivisions


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value4383105.4841.733
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition5.19.03.30.90.7

us-gaap:USTreasuryAndGovernment


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value11122.8682.8688.299
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition1.41.30.90.53.3

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value124617353813
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.2750.2020.0940.0640.0770.001
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss2.20.40.50.20.20.0

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value104217353812
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss85.790.198.599.599.798.3

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.0570.0080.0290.070.0230.201
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss0.50.00.20.20.11.5

us-gaap:USStatesAndPoliticalSubdivisions


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value1.3984.4160.1450.0370.009
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss11.49.40.80.10.1

us-gaap:USTreasuryAndGovernment


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.0180.030.0010.0010.005
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss0.10.10.00.00.0

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value17181221222121
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss us-gaap:FinancialInstrument

us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1.7246.5194.5152.9462.5322.9862.968
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss10.034.636.313.711.314.013.7

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value14117.47518191818
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss86.962.560.186.188.786.085.7

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.5260.5420.4520.0350.00.0030.137
Percentage of DebtSecuritiesHeldToMaturityAllowanceForCreditLoss3.12.93.60.20.00.00.6

us-gaap:DebtSecuritiesHeldToMaturityPastDue us-gaap:FinancingReceivablesPeriodPastDue

us-gaap:DebtSecuritiesHeldToMaturityPastDue

us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDue


Debt
Period End2020-09-30
Value38000.0
Percentage of DebtSecuritiesHeldToMaturityPastDue100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-31
Value664578
Percentage of DeferredIncomeTaxLiabilities100.0100.0

us-gaap:DeferredPolicyAcquisitionCosts

us-gaap:DeferredPolicyAcquisitionCosts


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-12-312017-12-31
Value14291421136014001408142314971373
Percentage of DeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCosts us-gaap:StatementBusinessSegments

anat:AccidentAndHealthSegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-12-312017-12-31
Value3032323332323336
Percentage of DeferredPolicyAcquisitionCosts2.12.32.42.42.32.32.32.7

anat:AnnuitySegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-12-312017-12-31
Value338344309357378415499426
Percentage of DeferredPolicyAcquisitionCosts23.724.222.725.526.929.233.431.0

anat:LifeSegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-12-312017-12-31
Value929919896880868852839791
Percentage of DeferredPolicyAcquisitionCosts65.064.765.962.961.759.956.057.6

anat:PropertyAndCasualtySegment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-12-312017-12-31
Value130125122129128122124119
Percentage of DeferredPolicyAcquisitionCosts9.18.89.09.39.18.68.38.7

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-31
Value188187
Percentage of DeferredTaxAssetsGross100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic


Deferred
Period End2020-12-312019-12-31
Value1638000.02344000.0
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsDomestic100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-31
Value2.49211
Percentage of DeferredTaxAssetsOther100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses


Deferred
Period End2020-12-312019-12-31
Value1916
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves


Deferred
Period End2020-12-312019-12-31
Value339.68
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther


Deferred
Period End2020-12-312019-12-31
Value9057000.03495000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities


Deferred
Period End2020-12-312019-12-31
Value5776
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve


Deferred
Period End2020-12-312019-12-31
Value2325
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve100.0100.0

us-gaap:DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost

us-gaap:DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost


Deferred
Period End2020-12-312019-12-31
Value199218
Percentage of DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost100.0100.0

us-gaap:DeferredTaxLiabilitiesInvestments

us-gaap:DeferredTaxLiabilitiesInvestments


Deferred
Period End2020-12-312019-12-31
Value1615
Percentage of DeferredTaxLiabilitiesInvestments100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-31
Value4044
Percentage of DeferredTaxLiabilitiesOther100.0100.0

us-gaap:DeferredTaxLiabilitiesOtherComprehensiveIncome

us-gaap:DeferredTaxLiabilitiesOtherComprehensiveIncome


Deferred
Period End2020-12-312019-12-31
Value388278
Percentage of DeferredTaxLiabilitiesOtherComprehensiveIncome100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-31
Value1920
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax


Defined
Period End2020-12-312019-12-31
Value-84976000.0-69915000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate


Defined
Period End2020-12-31
Value2.52
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:NonqualifiedPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value656568
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0

us-gaap:QualifiedPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value427387344
Percentage of DefinedBenefitPlanBenefitObligation650.2589.2507.1

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value5.34.7
Percentage of DefinedBenefitPlanBenefitObligation8.17.2

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter


Defined
Period End2020-12-31
Value140
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths


Defined
Period End2020-12-31
Value49
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive


Defined
Period End2020-12-31
Value30
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour


Defined
Period End2020-12-31
Value32
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree


Defined
Period End2020-12-31
Value33
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo


Defined
Period End2020-12-31
Value32
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets


Defined
Period End2020-12-312019-12-31
Value511470
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:DefinedBenefitPlanByPlanAssetCategories

anat:EquitySecuritiesConsumerGoods


Defined
Period End2020-12-312019-12-31
Value5746
Percentage of DefinedBenefitPlanFairValueOfPlanAssets11.39.8

anat:EquitySecuritiesEnergyAndUtilities


Defined
Period End2020-12-312019-12-31
Value2227
Percentage of DefinedBenefitPlanFairValueOfPlanAssets4.35.8

anat:EquitySecuritiesFinance


Defined
Period End2020-12-312019-12-31
Value4057
Percentage of DefinedBenefitPlanFairValueOfPlanAssets7.812.3

anat:EquitySecuritiesHealthcare


Defined
Period End2020-12-312019-12-31
Value5137
Percentage of DefinedBenefitPlanFairValueOfPlanAssets10.17.9

anat:EquitySecuritiesIndustrials


Defined
Period End2020-12-312019-12-31
Value2517
Percentage of DefinedBenefitPlanFairValueOfPlanAssets5.03.8

anat:EquitySecuritiesOthers


Defined
Period End2020-12-312019-12-31
Value7035
Percentage of DefinedBenefitPlanFairValueOfPlanAssets13.77.6

anat:InformationTechnology


Defined
Period End2020-12-312019-12-31
Value7860
Percentage of DefinedBenefitPlanFairValueOfPlanAssets15.412.8

anat:OtherPlanAssets


Defined
Period End2020-12-312019-12-31
Value1.4535.106
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.31.1

us-gaap:CommercialPaper


Defined
Period End2020-12-312019-12-31
Value0.8722.948
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.20.6

us-gaap:CorporateDebtSecurities


Defined
Period End2020-12-312019-12-31
Value157149
Percentage of DefinedBenefitPlanFairValueOfPlanAssets30.831.8

us-gaap:GroupPolicies


Defined
Period End2020-12-312019-12-31
Value1.940.598
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.40.1

us-gaap:ResidentialMortgageBackedSecurities


Defined
Period End2020-12-312019-12-31
Value3.5214.041
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.70.9

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

anat:EquitySecuritiesConsumerGoods, us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value5746
Percentage of DefinedBenefitPlanFairValueOfPlanAssets11.39.8

anat:EquitySecuritiesEnergyAndUtilities, us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value2227
Percentage of DefinedBenefitPlanFairValueOfPlanAssets4.35.8

anat:EquitySecuritiesFinance, us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value4057
Percentage of DefinedBenefitPlanFairValueOfPlanAssets7.812.3

anat:EquitySecuritiesHealthcare, us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value5137
Percentage of DefinedBenefitPlanFairValueOfPlanAssets10.17.9

anat:EquitySecuritiesIndustrials, us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value2517
Percentage of DefinedBenefitPlanFairValueOfPlanAssets5.03.8

anat:EquitySecuritiesOthers, us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value7035
Percentage of DefinedBenefitPlanFairValueOfPlanAssets13.77.6

anat:InformationTechnology, us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value7860
Percentage of DefinedBenefitPlanFairValueOfPlanAssets15.412.8

anat:OtherPlanAssets, us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value1.4535.106
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.31.1

us-gaap:CommercialPaper, us-gaap:FairValueInputsLevel2


Defined
Period End2020-12-312019-12-31
Value0.8722.948
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.20.6

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel2


Defined
Period End2020-12-312019-12-31
Value157149
Percentage of DefinedBenefitPlanFairValueOfPlanAssets30.731.8

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Defined
Period End2020-12-31
Value0.69
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.1

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Defined
Period End2020-12-312019-12-31
Value1.940.598
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.40.1

us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel2


Defined
Period End2020-12-312019-12-31
Value3.5214.041
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.70.9

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value347313
Percentage of DefinedBenefitPlanFairValueOfPlanAssets67.966.6

us-gaap:FairValueInputsLevel2


Defined
Period End2020-12-312019-12-31
Value163156
Percentage of DefinedBenefitPlanFairValueOfPlanAssets31.933.4

us-gaap:FairValueInputsLevel3


Defined
Period End2020-12-31
Value0.69
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.1

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:RetirementPlanTaxStatus

us-gaap:QualifiedPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value511470402
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.00.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:NonqualifiedPlan


Defined
Period End2020-12-312019-12-31
Value-65.791-65.733
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0

us-gaap:QualifiedPlan


Defined
Period End2020-12-312019-12-31
Value8482
Percentage of DefinedBenefitPlanFundedStatusOfPlan-128.0-126.0

us-gaap:DerivativeAssetFairValueOfCollateral

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Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value257251241210183257
Percentage of DerivativeAssetFairValueOfCollateral100.0100.0100.0100.0100.0100.0

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Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value4854494235
Percentage of DerivativeAssetFairValueOfCollateral19.021.720.520.019.3

anat:CreditSuisse, srt:MoodysBaa1Rating, srt:StandardPoorsBBBPlusRating


Derivative
Period End2021-06-302021-03-312020-12-31
Value25128.68
Percentage of DerivativeAssetFairValueOfCollateral9.95.03.6

anat:CreditSuisse, srt:MoodysBaa2Rating, srt:StandardPoorsBBBPlusRating


Derivative
Period End2020-09-302020-06-302019-12-31
Value7.674.477.39
Percentage of DerivativeAssetFairValueOfCollateral3.62.42.9

anat:GoldmanSachs, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Derivative
Period End2021-03-31
Value1.17
Percentage of DerivativeAssetFairValueOfCollateral0.5

anat:GoldmanSachs, srt:MoodysA3Rating, srt:StandardPoorsBBBPlusRating


Derivative
Period End2020-12-312020-09-302020-06-302019-12-31
Value1.170.910.910.93
Percentage of DerivativeAssetFairValueOfCollateral0.50.40.50.4

anat:ING, srt:MoodysBaa1Rating, srt:StandardPoorsAMinusRating


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value161920212430
Percentage of DerivativeAssetFairValueOfCollateral6.57.78.610.013.312.0

anat:MorganStanley, srt:MoodysA1Rating, srt:StandardPoorsBBBPlusRating


Derivative
Period End2021-06-302021-03-31
Value6550
Percentage of DerivativeAssetFairValueOfCollateral25.319.9

anat:MorganStanley, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Derivative
Period End2020-12-31
Value36
Percentage of DerivativeAssetFairValueOfCollateral15.0

anat:MorganStanley, srt:MoodysA3Rating, srt:StandardPoorsBBBPlusRating


Derivative
Period End2020-09-302020-06-302019-12-31
Value211334
Percentage of DerivativeAssetFairValueOfCollateral10.07.613.6

anat:Natixis, srt:MoodysA1Rating, srt:StandardPoorsAPlusRating


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value2930312630
Percentage of DerivativeAssetFairValueOfCollateral11.712.714.714.511.7

anat:Natixis, srt:MoodysA1Rating, srt:StandardPoorsARating


Derivative
Period End2021-06-30
Value27
Percentage of DerivativeAssetFairValueOfCollateral10.6

anat:SunTrustBank, srt:MoodysA3Rating, srt:StandardPoorsAMinusRating


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value364454514558
Percentage of DerivativeAssetFairValueOfCollateral14.017.822.824.624.922.8

anat:Truist, srt:MoodysA3Rating, srt:StandardPoorsAMinusRating


Derivative
Period End2020-12-31
Value54
Percentage of DerivativeAssetFairValueOfCollateral22.8

anat:WellsFargo, srt:MoodysA2Rating, srt:StandardPoorsAMinusRating


Derivative
Period End2020-09-302020-06-302019-12-31
Value343239
Percentage of DerivativeAssetFairValueOfCollateral16.617.515.2

anat:WellsFargo, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating


Derivative
Period End2021-06-302021-03-312020-12-31
Value373939
Percentage of DerivativeAssetFairValueOfCollateral14.715.716.3

us-gaap:DerivativeAssetFairValueOfCollateral us-gaap:CounterpartyName, us-gaap:CreditRatingMoodys, us-gaap:CreditRatingStandardPoors, us-gaap:FinancialInstrument

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Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3036312417
Percentage of DerivativeAssetFairValueOfCollateral11.914.513.011.49.5

anat:CreditSuisse, srt:MoodysBaa1Rating, srt:StandardPoorsBBBPlusRating, us-gaap:Cash


Derivative
Period End2021-06-302021-03-312020-12-31
Value25128.68
Percentage of DerivativeAssetFairValueOfCollateral9.95.03.6

anat:CreditSuisse, srt:MoodysBaa2Rating, srt:StandardPoorsBBBPlusRating, us-gaap:Cash


Derivative
Period End2020-09-302020-06-302019-12-31
Value7.674.477.39
Percentage of DerivativeAssetFairValueOfCollateral3.62.42.9

anat:GoldmanSachs, srt:MoodysA2Rating, srt:StandardPoorsBBBPlusRating, us-gaap:Cash


Derivative
Period End2021-03-31
Value1.17
Percentage of DerivativeAssetFairValueOfCollateral0.5

anat:GoldmanSachs, srt:MoodysA3Rating, srt:StandardPoorsBBBPlusRating, us-gaap:Cash


Derivative
Period End2020-12-312020-09-302020-06-302019-12-31
Value1.170.910.910.93
Percentage of DerivativeAssetFairValueOfCollateral0.50.40.50.4

anat:ING, srt:MoodysBaa1Rating, srt:StandardPoorsAMinusRating, us-gaap:Cash


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value6.439.2210101414
Percentage of DerivativeAssetFairValueOfCollateral2.53.74.35.17.65.8

anat:ING, srt:MoodysBaa1Rating, srt:StandardPoorsAMinusRating, us-gaap:SecuritiesAssets


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value101010101016
Percentage of DerivativeAssetFairValueOfCollateral4.04.14.34.95.66.2

anat:MorganStanley, srt:MoodysA1Rating, srt:StandardPoorsBBBPlusRating, us-gaap:Cash


Derivative
Period End2021-06-302021-