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Investments in Securities Available-for-sale Securities 1 (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Gross realized gains $ 3 $ 9
Gross realized losses 2 4
Total proceeds $ 35 [1] $ 94 [1]
[1] Excludes proceeds from the initial sale of securities from new portfolio securitizations included in “Note 2, Consolidations and Transfers of Financial Assets.”