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
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
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 $ 1,010 $ 946
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 615 1,190
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 395 (244)
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 277 129
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 8 (85)
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 (250) (285)
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 (14) 0
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 161 (23)
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 (1)
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 (48) 59
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 (4) (5)
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 205 240
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 24 42
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 270 1,071
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 $ 381 $ (196)