v2.4.0.6
Derivatives, Net Gains (Losses) in Income related to Derivatives Not Designated as Hedging Instruments (Details) (Not Designated as Hedging Instrument [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Net gains recognized related to derivatives not designated as hedging instruments $ 6,066 $ 5,414
Customer accommodation trading and other free standing derivatives [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments 8,010 5,278
Free standing derivatives (economic hedges) [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments (1,944) 136
Foreign Exchange Contract [Member] | Customer accommodation trading and other free standing derivatives [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments 501 698
Foreign Exchange Contract [Member] | Free standing derivatives (economic hedges) [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments (53) 70
Equity Contract [Member] | Customer accommodation trading and other free standing derivatives [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments (234) 769
Equity Contract [Member] | Free standing derivatives (economic hedges) [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments 4 (5)
Commodity Contract [Member] | Customer accommodation trading and other free standing derivatives [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments (14) 124
Other Contract [Member] | Customer accommodation trading and other free standing derivatives [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments 0 (5)
Credit Contract [Member] | Customer accommodation trading and other free standing derivatives [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments (54) (200)
Credit Contract [Member] | Free standing derivatives (economic hedges) [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments (15) (18)
Interest Rate Contracts Recognized In Noninterest Income Other [Member] | Customer accommodation trading and other free standing derivatives [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments 589 298
Interest Rate Contracts Recognized In Noninterest Income Other [Member] | Free standing derivatives (economic hedges) [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments 2 (157)
Interest Rate Contracts Recognized In Noninterest Income Mortgage Banking [Member] | Customer accommodation trading and other free standing derivatives [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments 7,222 3,594
Interest Rate Contracts Recognized In Noninterest Income Mortgage Banking [Member] | Free standing derivatives (economic hedges) [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]    
Gain (Loss) on Derivative Instruments $ (1,882) $ 246