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Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Servicing Asset at Amortized Cost [Line Items] |  |  |
Excess spread financing - fair value | $ 446 | $ 509 |
Forward MSRs Sold |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | 23,789 |  | $ 20,723
Forward MSRs Sold, Subservicing Retained |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | 22,640 |  | $ 19,692
Excess spread financing |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | $ 76,732 | $ 83,706 |

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