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Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Servicing Assets at Fair Value [Line Items] |  |
Sale of Excess Yield, Principal Outstanding | $ 27,841 | $ 41,958
Sale of Excess Yield, Total Proceeds | 226 | 294
Gain on Sale of Excess Yield | 27 | 33
Excess Spread Financing UPB, Fair Value Disclosure | 66,519 | 74,219
Forward MSRs Sold |  |
Servicing Assets at Fair Value [Line Items] |  |
Unpaid principal balance sold | 26,739 | 25,239
Forward MSRs Sold, Subservicing Retained |  |
Servicing Assets at Fair Value [Line Items] |  |
Principal amount outstanding on mortgage servicing rights | $ 26,156 | $ 23,218

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