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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, 2024
Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in AOCI on Derivatives $ 41 $ 85
Gain (Loss) Reclassified From AOCI into Income (7) (45)
Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in AOCI on Derivatives (1) 0
Foreign exchange contracts | Net interest income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified From AOCI into Income 0 0
Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in AOCI on Derivatives 42 85
Interest rate contracts | Net interest income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified From AOCI into Income $ (7) $ (45)