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, 2025 |
Mar. 31, 2024 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Gain (Loss) Recognized in AOCI on Derivatives | $ (115) | $ 41 |
| Gain (Loss) Reclassified From AOCI into Income | (10) | (7) |
| Foreign exchange contracts | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Gain (Loss) Recognized in AOCI on Derivatives | (2) | (1) |
| 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 | (113) | 42 |
| Interest rate contracts | Net interest income | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Gain (Loss) Reclassified From AOCI into Income | $ (10) | $ (7) |