Mortgage Servicing Rights and Related Liabilities - Schedule of Loan Servicing Income, Net (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Transfers and Servicing [Abstract] | ||||
| Contractually specified servicing fees | $ 903 | $ 382 | $ 1,822 | $ 763 |
| Subservicing income | 103 | 3 | 214 | 7 |
| Other ancillary income | 60 | 16 | 113 | 32 |
| Servicing fee income | 1,066 | 401 | 2,149 | 802 |
| Change in valuation model inputs or assumptions for MSRs and related liabilities | 70 | (25) | 349 | (286) |
| Change in fair value of MSR hedge | (47) | 45 | (207) | 47 |
| Collection/realization of cash flows | (639) | (219) | (1,243) | (409) |
| Change in fair value of MSRs, net | (616) | (199) | (1,101) | (648) |
| Loan servicing income, net | 450 | 202 | 1,048 | 154 |
| Servicing fees from loans sold | $ 684 | $ 341 | $ 1,220 | $ 682 |