Derivative Financial Instruments - Narrative (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | |||||
| Losses related to discontinued cash flow hedge relationships | $ (17) | $ 16 | $ 27 | $ 23 | |
| Cash flow hedge gain (loss) to be reclassified within twelve months | (59) | ||||
| Aggregate fair value of all derivative instruments with credit-risk related contingent features | 74 | 74 | $ 401 | ||
| Collateral already posted aggregate fair value | $ 24 | $ 24 | $ 153 | ||
| OCI, Cash Flow Hedge, Reclassification for Discontinuance, Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Income (Expense), Operating | ||||