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Investments in Securities Available-for-sale Securities 1 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains $ 227 $ 234 $ 230 $ 445
Gross realized losses 0 8 0 12
Total proceeds (excludes initial sale of securities from new portfolio securitizations) $ 799 $ 3,645 $ 894 $ 7,267