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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivatives $ (120) $ (82) $ (35) $ (283)
Gain (Loss) Reclassified From AOCI into Income (55) (1) (100) (2)
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivatives (120) (82) (35) (283)
Interest rate contracts | Net interest income        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Reclassified From AOCI into Income $ (55) $ (1) $ (100) $ (2)