v2.4.0.8
Derivatives, Net Gains (Losses) in Income related to Fair Value Hedges (Details) (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 In Fair Value Hedging Relationships [Abstract]        
Net interest income (expense) recognized on derivatives $ 328 $ 394 $ 669 $ 769
Gains (losses) recorded in noninterest income recognized on derivatives (1,281) 107 (2,268) 153
Gains (losses) recorded in noninterest income recognized on hedged item 1,147 110 2,110 (52)
Net recognized on fair value hedges (ineffective portion) (134) 217 (158) 101
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]        
Net interest income (expense) recognized on derivatives (136) (113) (261) (225)
Gains (losses) recorded in noninterest income recognized on derivatives 899 (512) 1,203 (210)
Gains (losses) recorded in noninterest income recognized on hedged item (890) 494 (1,178) 198
Net recognized on fair value hedges (ineffective portion) 9 (18) 25 (12)
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]        
Net interest income (expense) recognized on derivatives (2) (1) (2) (4)
Gains (losses) recorded in noninterest income recognized on derivatives 104 145 312 186
Gains (losses) recorded in noninterest income recognized on hedged item (100) (148) (303) (162)
Net recognized on fair value hedges (ineffective portion) 4 (3) 9 24
Long-term debt [Member] | Interest Rate Contract [Member]
        
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]        
Net interest income (expense) recognized on derivatives 395 447 792 866
Gains (losses) recorded in noninterest income recognized on derivatives (1,666) 1,202 (2,394) 334
Gains (losses) recorded in noninterest income recognized on hedged item 1,576 (1,014) 2,264 (212)
Net recognized on fair value hedges (ineffective portion) (90) 188 (130) 122
Long-term debt [Member] | Foreign Exchange Contract [Member]
        
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]        
Net interest income (expense) recognized on derivatives 69 60 137 131
Gains (losses) recorded in noninterest income recognized on derivatives (607) (717) (1,380) (151)
Gains (losses) recorded in noninterest income recognized on hedged item 557 770 1,328 122
Net recognized on fair value hedges (ineffective portion) (50) 53 (52) (29)
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]        
Net interest income (expense) recognized on derivatives 2 1 3 1
Gains (losses) recorded in noninterest income recognized on derivatives (11) (11) (9) (6)
Gains (losses) recorded in noninterest income recognized on hedged item 4 8 (1) 2
Net recognized on fair value hedges (ineffective portion) $ (7) $ (3) $ (10) $ (4)