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Derivative Financial Instruments - Gains and Losses on Hedged Items in Fair Value Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Interest Income Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative $ (30) $ (44) $ (110) $ (138)
Gain (Loss) on Hedged Items 58 70 186 218
Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative (1) (407) (956) (214)
Gain (Loss) on Hedged Items (11) 389 895 204
Net Ineffective Gain (Loss) Recognized - Other Income (12) (18) (61) (10)
Available-for-sale Securities [Member] | Interest Income [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative (38) (51) (133) (154)
Gain (Loss) on Hedged Items 92 92 281 273
Available-for-sale Securities [Member] | Other Income [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative 26 (434) (1,027) (229)
Gain (Loss) on Hedged Items (37) 414 965 217
Net Ineffective Gain (Loss) Recognized - Other Income (11) (20) (62) (12)
Long-term Debt [Member] | Interest Expense [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative 8 7 23 16
Gain (Loss) on Hedged Items (34) (22) (95) (55)
Long-term Debt [Member] | Other Income [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Derivative (27) 27 71 15
Gain (Loss) on Hedged Items 26 (25) (70) (13)
Net Ineffective Gain (Loss) Recognized - Other Income $ (1) $ 2 $ 1 $ 2