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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 Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Gross gains $ 17 $ 226 $ 38 $ 231
Gross losses (1) (2) (1) (4)
Net realized gains/(losses) 16 224 37 227
Other-than-temporary impairments (10) (37) (11) (49)
Non-credit portion recognized in other comprehensive income (8) 32 (28) 38
Total securities gains (losses), net (2) 219 (2) 216
Non-Agency Mortgage-Backed Securities [Member]
       
Other-than-temporary impairments (10) (37) (11) (49)
Non-credit portion recognized in other comprehensive income (8) [1] 32 [1] (28) [1] 38 [1]
Total OTTI recognized in net income $ (18) $ (5) $ (39) $ (11)
[1] A negative balance is the result of additional credit losses currently recognized in earnings that were previously recognized in other comprehensive income.