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Investments in Securities Available-for-sale Securities 1 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Gross realized gains $ 211 $ 400
Gross realized losses 4 7
Total proceeds (excludes initial sale of securities from new portfolio securitizations) $ 3,622 $ 2,112