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Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Pre-tax      
Unrealized net holding gains and losses arising during the period, net of related offsets, Pre-tax $ 1,026us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ (1,278)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ 2,428us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: reclassification adjustment of realized capital gains and losses, Pre-tax 597us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 549us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 225us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Unrealized net capital gains and losses, Pre-tax 429all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTaxIncludingOtherThanTemporaryImpairmentLosses (1,827)all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTaxIncludingOtherThanTemporaryImpairmentLosses 2,203all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTaxIncludingOtherThanTemporaryImpairmentLosses
Unrealized foreign currency translation adjustments, Pre-tax (62)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (49)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax 22us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Unrecognized pension and other postretirement benefit cost arising during the period, Pre-tax (1,197)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax 1,231us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax (634)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses, Pre-tax (78)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax (445)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax (166)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax
Unrecognized pension and other postretirement benefit cost, Pre-tax (1,119)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 1,676us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax (468)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other comprehensive (loss) income (752)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (200)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent 1,757us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Tax      
Unrealized net holding gains and losses arising during the period, net of related offsets, Tax (358)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 447us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (848)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Less: reclassification adjustment of realized capital gains and losses, Tax (209)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (192)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (79)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Unrealized net capital gains and losses, Tax (149)all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesTax 639all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesTax (769)all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesTax
Unrealized foreign currency translation adjustments, Tax 22us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax 17us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax (8)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Unrecognized pension and other postretirement benefit cost arising during the period, Tax 421us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax (429)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax 224us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses, Tax 27us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax 156us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax 58us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax
Unrecognized pension and other postretirement benefit cost, Tax 394us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (585)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax 166us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Other comprehensive income (loss), Tax 267us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 71us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 (611)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
After-tax      
Unrealized net holding gains and losses arising during the period, net of related offsets, After-tax 668us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (831)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 1,580us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: reclassification adjustment of realized capital gains and losses, After-tax 388us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 357us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 146us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Unrealized net capital gains and losses, After-tax 280all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax (1,188)all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax 1,434all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax
Unrealized foreign currency translation adjustments, After-tax (40)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (32)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 14us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrecognized pension and other postretirement benefit cost arising during the period, After-tax (776)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax 802us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax (410)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses, After-tax (51)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax (289)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax (108)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
Unrecognized pension and other postretirement benefit cost, After-tax (725)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 1,091us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (302)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive (loss) income, after-tax $ (485)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent $ (129)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent $ 1,146us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent