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Investments in Securities Available-for-sale Securities 1 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]      
Gross realized gains $ 1,043 $ 1,066 $ 569
Gross realized losses 17 70 5
Total proceeds (excludes initial sale of securities from new portfolio securitizations) $ 10,993 $ 8,023 $ 3,265