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Realized Gains and Losses Recognized in Income from Available-for-Sale Securities (Detail) (Available-for-sale Securities, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale Securities
      
Investments, Unrealized Loss Position      
Realized gains $ 70us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 $ 77us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 $ 75us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember
Realized losses (9)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 (102)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 (2)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember
OTTI (24)us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 (74)us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 (58)us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember
Net realized gains (losses) $ 37us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 [1] $ (99)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 [1] $ 15us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 [1]
[1] Excludes net losses on interest-only mortgage-backed securities of $17 for the year ended December 31, 2014 and net gains on interest-only mortgage-backed securities of $129 for the year ended December 31, 2013.