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Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Servicing Assets at Fair Value [Line Items] |  |  |
Excess spread financing - fair value | $ 403 |  | $ 437
Excess Spread Financing UPB, Fair Value Disclosure | 68,594 |  | $ 74,219
Sale of Excess Yield, UPB | 27,841 | $ 41,958 |
Sale of Excess Yield, Total Proceeds | 226 | 294 |
Gain on Sale of Excess Yield | 27 | 33 |
Forward MSRs Sold |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Unpaid principal balance sold | 7,716 | 23,789 |
Forward MSRs Sold, Subservicing Retained |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
UPB | $ 7,319 | $ 22,640 |

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