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Securities (Gross Realized Gains and Losses and Other-than- temporary Impairments Recognized in Net Income) (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Gross gains$ 0$ 241$ 38$ 472
Gross losses00(1)(4)
Net realized gains/(losses)024137468
Other-than-temporary impairments(7)0(18)(49)
Non-credit portion recognized in other comprehensive income(32)(2)(60)36
Total securities gains (losses), net(39)239(41)455
Non-Agency Mortgage-Backed Securities [Member]
    
Other-than-temporary impairments(7)0(18)(49)
Non-credit portion recognized in other comprehensive income(32)[1](2)[1](60)[1]36[1]
Total OTTI recognized in net income$ (39)$ (2)$ (78)$ (13)
[1]A negative balance is the result of additional credit losses currently recognized in earnings that were previously recognized in other comprehensive income.