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Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Servicing Assets at Fair Value [Line Items] |  |  |
Excess spread financing - fair value | $ 357 |  | $ 386
Excess Spread Financing UPB, Fair Value Disclosure | 63,113 |  | $ 66,519
Sale of Excess Yield, UPB | 20,562 | $ 27,841 |
Sale of Excess Yield, Total Proceeds | 138 | 226 |
Gain on Sale of Excess Yield | (10) | 27 |
Forward MSRs Sold |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Unpaid principal balance sold | 8,583 | 3,305 |
Forward MSRs Sold, Subservicing Retained |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
UPB | $ 8,091 | $ 3,029 |

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