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Derivative Financial Instruments - Gains and Losses on Hedged Items in Fair Value Hedges (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Interest Income Expense [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative - Interest Income (Expense) $ (30) $ 12 $ (107) $ 3
Gain (Loss) on Hedged Items - Interest Income (Expense) 126 155 436 436
Interest Income Expense [Member] | Interest rate contracts/AFS securities [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative - Interest Income (Expense) (33) 4 (117) (18)
Gain (Loss) on Hedged Items - Interest Income (Expense) 141 187 482 506
Interest Income Expense [Member] | Interest rate contracts/commercial loans [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative - Interest Income (Expense)   (6)   (17)
Interest Income Expense [Member] | Interest rate contracts/subordinated debt [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative - Interest Income (Expense) 3 14 10 38
Gain (Loss) on Hedged Items - Interest Income (Expense) (15) (32) (46) (70)
Other Income [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative - Interest Income (Expense) (38) (1,311) (317) (1,635)
Gain (Loss) on Hedged Items - Interest Income (Expense) 55 1,266 314 1,589
Other Income [Member] | Interest rate contracts/AFS securities [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative - Interest Income (Expense) (41) (1,322) (326) (1,640)
Gain (Loss) on Hedged Items - Interest Income (Expense) 58 1,278 323 1,598
Other Income [Member] | Interest rate contracts/commercial loans [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative - Interest Income (Expense)   1   1
Gain (Loss) on Hedged Items - Interest Income (Expense)   (1)   (3)
Other Income [Member] | Interest rate contracts/subordinated debt [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative - Interest Income (Expense) 3 10 9 4
Gain (Loss) on Hedged Items - Interest Income (Expense) $ (3) $ (11) $ (9) $ (6)