v3.25.2
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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivatives $ (66) $ 21 $ (181) $ 62
Gain (Loss) Reclassified From AOCI into Income (17) (16) (27) (23)
Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivatives (1) 0 (3) (1)
Foreign exchange contracts | Net interest income        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Reclassified From AOCI into Income 0 0 0 0
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivatives (65) 21 (178) 63
Interest rate contracts | Net interest income        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Reclassified From AOCI into Income $ (17) $ (16) $ (27) $ (23)