v2.4.0.6
Derivatives, Net Gains (Losses) in Income related to Fair Value Hedges (Details) (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 In Fair Value Hedging Relationships [Abstract]    
Gains (losses) recorded in net interest income $ 341 $ 375
Gains (losses) recorded in noninterest income Recognized on derivatives (987) 46
Gains (losses) recorded in noninterest income Recognized on hedged item 963 (162)
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion) (24) (116)
Available for sale Securities [Member] | Interest Rate Contract [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]    
Gains (losses) recorded in net interest income (125) (112)
Gains (losses) recorded in noninterest income Recognized on derivatives 304 302
Gains (losses) recorded in noninterest income Recognized on hedged item (288) (296)
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion) 16 6
Available for sale Securities [Member] | Foreign Exchange Contract [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]    
Gains (losses) recorded in net interest income 0 (3)
Gains (losses) recorded in noninterest income Recognized on derivatives 208 41
Gains (losses) recorded in noninterest income Recognized on hedged item (203) (14)
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion) 5 27
Long-term debt [Member] | Interest Rate Contract [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]    
Gains (losses) recorded in net interest income 397 419
Gains (losses) recorded in noninterest income Recognized on derivatives (728) (868)
Gains (losses) recorded in noninterest income Recognized on hedged item 688 802
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion) (40) (66)
Long-term debt [Member] | Foreign Exchange Contract [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]    
Gains (losses) recorded in net interest income 68 71
Gains (losses) recorded in noninterest income Recognized on derivatives (773) 566
Gains (losses) recorded in noninterest income Recognized on hedged item 771 (648)
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion) (2) (82)
Mortgages held for sale [Member] | Interest Rate Contract [Member]
    
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]    
Gains (losses) recorded in net interest income 1 0
Gains (losses) recorded in noninterest income Recognized on derivatives 2 5
Gains (losses) recorded in noninterest income Recognized on hedged item (5) (6)
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion) $ (3) $ (1)