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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 1,088us-gaap_NetIncomeLoss $ 808us-gaap_NetIncomeLoss $ 110us-gaap_NetIncomeLoss
Unrealized holding gains (losses) arising during the period on:      
Investments with no other-than-temporary impairment, net of tax provision (benefit) of $80, $(106) and $56 196ago_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax (309)ago_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax 148ago_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax
Investments with other-than-temporary impairment, net of tax provision (benefit) of $(9), $(17) and $(2) (20)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities (35)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities (7)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities
Unrealized holding gains (losses) arising during the period, net of tax 176us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (344)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 141us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: reclassification adjustment for gains (losses) included in net income (loss), net of tax provision (benefit) of $(21), $5 and $(7) (41)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 14us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Change in net unrealized gains on investments 217ago_OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentIncludingOtherThanTemporaryImpairmentLossesNetofTaxPortionAttributabletoParent (358)ago_OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentIncludingOtherThanTemporaryImpairmentLossesNetofTaxPortionAttributabletoParent 145ago_OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentIncludingOtherThanTemporaryImpairmentLossesNetofTaxPortionAttributabletoParent
Other, net of tax provision (7)ago_OtherComprehensiveIncomeLossOther 3ago_OtherComprehensiveIncomeLossOther 2ago_OtherComprehensiveIncomeLossOther
Other comprehensive income (loss) 210us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (355)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 147us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) $ 1,298us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest $ 453us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest $ 257us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest