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Mortgage Servicing Rights - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Transfers and Servicing [Abstract] |  |  |  |  |
Residential mortgage loans serviced for others including subserviced mortgages with no corresponding MSRs asset | $ 216,100 |  | $ 216,100 |  | $ 216,600
Gain (loss) on fair value changes of MSRs due to changes in valuation assumptions and derivatives used to economically hedge MSRs | 12 | $ (10) | 10 | $ 11 |
Loan servicing and ancillary fees | $ 173 | $ 170 | $ 526 | $ 517 |

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- Definition Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-2 + Details
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- References No definition available. + Details
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- Definition Gain/Loss on fair value changes of MSRs due to changes in valuation assumptions and derivatives used to economically hedge MSRs. + References No definition available. + Details
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- Definition Residential mortgage loans serviced for others including subserviced mortgages with no corresponding mortgage servicing rights asset. + References No definition available. + Details
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