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Investments in Securities Trading 2 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]        
Net trading gains $ 20 $ 249 $ 56 $ 394
Net trading (losses) gains recognized in the period related to securities still held at period end $ (1) $ 233 $ (3) $ 353