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Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Servicing Assets at Fair Value [Line Items] |  |
Sale of Excess Yield, Principal Outstanding | $ 41,958 |
Sale of Excess Yield, Total Proceeds | 294 |
Gain on Sale of Excess Yield | 33 |
Excess Spread Financing UPB, Fair Value Disclosure | 74,219 | $ 83,706
Forward MSRs Sold |  |
Servicing Assets at Fair Value [Line Items] |  |
Unpaid principal balance sold | 25,239 | 20,902
Forward MSRs Sold, Subservicing Retained |  |
Servicing Assets at Fair Value [Line Items] |  |
Principal amount outstanding on mortgage servicing rights | $ 23,218 | $ 19,817

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