Mortgage Servicing Assets - Schedule of Changes in Carrying Amount of Mortgage Servicing Assets (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Agency commercial mortgage-backed securities | ||||
| Servicing Asset at Amortized Cost, Balance [Roll Forward] | ||||
| Balance at beginning of period | $ 572 | $ 597 | $ 577 | $ 609 |
| Servicing retained from loan sales | 12 | 17 | 34 | 32 |
| Purchases | 0 | 4 | 4 | 8 |
| Amortization | (32) | (31) | (63) | (62) |
| Balance at end of period | 552 | 587 | 552 | 587 |
| Fair value at end of period | 777 | 787 | 777 | 787 |
| Agency residential mortgage-backed securities | ||||
| Servicing Asset at Amortized Cost, Balance [Roll Forward] | ||||
| Balance at beginning of period | 114 | 111 | 112 | 111 |
| Servicing retained from loan sales | 4 | 4 | 9 | 7 |
| Amortization | (4) | (3) | (7) | (6) |
| Balance at end of period | 114 | 112 | 114 | 112 |
| Fair value at end of period | $ 140 | $ 136 | $ 140 | $ 136 |