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Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Servicing Assets at Fair Value [Line Items] |  |  |
Excess spread financing - fair value | $ 420 |  | $ 437
Excess Spread Financing UPB, Fair Value Disclosure | 72,397 |  | $ 74,219
Forward MSRs Sold |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Unpaid principal balance sold | 3,144 | $ 1,256 |
Forward MSRs Sold, Subservicing Retained |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
UPB | $ 3,003 | $ 271 |

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