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Consolidations and Transfers of Financial Assets Qualifying Sales of Portfolio Securitizations (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Transfers and Servicing [Abstract]      
Proceeds from the initial sale of securities from portfolio securitizations $ 340 $ 672 $ 1,000