Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Loans measured at fair value on nonrecurring basis | $ 314 | $ 524 |
| Changes in fair value recognized for the quarter ended | (38) | (35) |
| Level 1 | ||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Loans measured at fair value on nonrecurring basis | 0 | 0 |
| Level 2 | ||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Loans measured at fair value on nonrecurring basis | 74 | 128 |
| Level 3 | ||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Loans measured at fair value on nonrecurring basis | $ 240 | $ 396 |