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Derivative Financial Instruments (Details 8) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Gains and losses on derivative instruments held for other purposes        
Derivative instruments, gain (loss) recognized in income net $ 110 $ 241 $ 403 $ 312
Other income [Member] | Interest rate contracts [Member]
       
Gains and losses on derivative instruments held for other purposes        
Derivative instruments, gain (loss) recognized in income net 195 146 105 135
Other income [Member] | Foreign exchange contracts [Member]
       
Gains and losses on derivative instruments held for other purposes        
Derivative instruments, gain (loss) recognized in income net 36 6 50 (1)
Other income [Member] | Equity contracts [Member]
       
Gains and losses on derivative instruments held for other purposes        
Derivative instruments, gain (loss) recognized in income net (118) 89 246 192
Other income [Member] | Credit contracts [Member]
       
Gains and losses on derivative instruments held for other purposes        
Derivative instruments, gain (loss) recognized in income net (1) (1) (3) (3)
Residential mortgage banking revenue [Member] | Interest rate contracts [Member]
       
Gains and losses on derivative instruments held for other purposes        
Derivative instruments, gain (loss) recognized in income net $ (2) $ 1 $ 5 $ (11)