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Investments in Securities Trading 2 (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract]        
Net trading gains (losses) $ 249 $ (228) $ 394 $ 168
Net trading gains (losses) recognized in the period related to securities still held at period end $ 233 $ (273) $ 353 $ 125