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Derivative Financial Instruments - Gains and Losses on Hedged Items in Fair Value Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Interest Income Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative $ (43) $ (62) $ (94) $ (121)
Gain (Loss) on Hedged Items 71 95 148 182
Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative 441 (188) 193 (408)
Gain (Loss) on Hedged Items (425) 189 (185) 402
Net Ineffective Gain (Loss) Recognized - Other Income 16 1 8 (6)
Available-for-sale Securities [Member] | Interest Income [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative (49) (64) (103) (127)
Gain (Loss) on Hedged Items 93 96 181 198
Available-for-sale Securities [Member] | Other Income [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative 453 (188) 205 (407)
Gain (Loss) on Hedged Items (437) 189 (197) 401
Net Ineffective Gain (Loss) Recognized - Other Income 16 1 8 (6)
Subordinated Debt [Member] | Interest Expense [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative 6 2 9 6
Gain (Loss) on Hedged Items (22) (1) (33) (16)
Subordinated Debt [Member] | Other Income [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative (12) 0 (12) (1)
Gain (Loss) on Hedged Items 12 0 12 1
Net Ineffective Gain (Loss) Recognized - Other Income $ 0 $ 0 $ 0 $ 0