v2.4.0.8
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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 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 $ 829 $ 2,194 $ 1,839 $ 3,140
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 (578) 2,819 37 4,009
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 1,407 (625) 1,802 (869)
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 138 120 415 249
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 12 84 20 (1)
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 (7) 206 (257) (79)
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 (24) 1 (38) 1
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 63 (21) 224 (44)
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 0 0
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 28 (48) (20) 11
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 (2) (5) (6) (10)
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 376 90 581 330
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 74 (75) 98 (33)
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 (1,176) 2,471 (906) 3,542
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 $ 1,347 $ (630) $ 1,728 $ (826)