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Derivative Financial Instruments - Gains and Losses on Derivative Instruments Designated and Qualifying As Hedging Instruments in Cash Flow Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in AOCI on Derivatives $ (17) $ 113
Gain (Loss) Reclassified From AOCI into Income (1) (6)
Foreign exchange contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in AOCI on Derivatives (1) 0
Foreign exchange contracts [Member] | Net Interest Income [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified From AOCI into Income 0 0
Interest rate contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in AOCI on Derivatives (16) 113
Interest rate contracts [Member] | Net Interest Income [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified From AOCI into Income $ (1) $ (6)