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Mortgage Servicing Rights - Summary of Income and Fees (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Servicing Assets at Fair Value [Line Items] |  |
Decrease in MSR fair value due to pay-offs, pay-downs, run-off, model changes and other | $ (26) | $ (18)
Changes in fair value due to interest rate risk | 34 | (19)
Residential first mortgage loans |  |
Servicing Assets at Fair Value [Line Items] |  |
Servicing fees, ancillary income and late fees | 58 | 56
Decrease in MSR fair value due to pay-offs, pay-downs, run-off, model changes and other | (26) | (18)
Changes in fair value due to interest rate risk | 34 | (19)
Gain on MSR derivatives | (44) | 3
Net transaction costs | (1) | (1)
Total return (loss) included in net return on mortgage servicing rights | 21 | 21
Residential first mortgage loans | Loan administration income on mortgage loans subserviced |  |
Servicing Assets at Fair Value [Line Items] |  |
Servicing fees, ancillary income and late fees | 37 | 36
Charges on subserviced custodial balances | (36) | (29)
Other servicing charges | 1 | (1)
Total income (loss) on mortgage loans subserviced, included in loan administration income | 2 | $ 6
FDIC Serviced Loans | Loan administration income on mortgage loans subserviced |  |
Servicing Assets at Fair Value [Line Items] |  |
Servicing fees, ancillary income and late fees | $ 10 |

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- Definition The total amount of other servicing charges earned on loans serviced and subserviced for others during the period for which results of operations are presented. + References No definition available. + Details
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- Definition The total amount of income earned on loans serviced and subserviced for others during the period for which results of operations are presented. + References No definition available. + Details
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- Definition The total amount of net transaction costs earned on loans serviced and subserviced for others during the period for which results of operations are presented. + References No definition available. + Details
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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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- Definition Gain (loss) incurred in hedging activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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- Definition Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(4)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-3 + Details
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