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Investments in Securities Trading 2 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]        
Net trading gains $ 13 $ 50 $ 69 $ 444
Net trading gains (losses) recognized in the period related to securities still held at period end $ (15) $ 56 $ (29) $ 409