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Securities Available for Sale and Securities Held to Maturity (Proceeds and Gross Realized Gains and Losses from Sales of Securities Available for Sale) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Securities Available for Sale and Securities Held to Maturity [Abstract]      
Proceeds $ 6,556us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 6,167us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 3,336us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross realized gains 30us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 7us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 35us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses $ 23us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses