Derivatives and Hedging Activities Derivatives in Statements of Income (Details) - 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] | ||||
| Economic hedges | $ (3) | $ 3 | $ (21) | $ 18 |
| Variation margin on derivatives | 1 | (1) | 1 | (1) |
| Noninterest income (loss) - Derivatives and hedging activities | (2) | 2 | (20) | 17 |
| Interest rate contracts | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Economic hedges | (5) | 6 | (25) | 20 |
| Mortgage delivery commitments | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Economic hedges | 2 | (4) | 6 | (4) |
| Other | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Economic hedges | $ 0 | $ 1 | $ (2) | $ 2 |