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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Fixed maturity securities, available-for-sale, at fair value $ 9,310us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 9,972us-gaap_AvailableForSaleSecuritiesAmortizedCost
Common stock par value (per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 500,000,000us-gaap_CommonStockSharesAuthorized 500,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 152,835,331us-gaap_CommonStockSharesIssued 158,306,661us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 152,835,331us-gaap_CommonStockSharesOutstanding 158,306,661us-gaap_CommonStockSharesOutstanding
Accumulated other comprehensive income, tax provision $ 149us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome $ 159us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Deferred equity compensation, shares 320,193ago_DeferredCompensationEquityShare 320,193ago_DeferredCompensationEquityShare