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Mortgage Servicing Rights - Summary of Income and Fees (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Servicing Assets at Fair Value [Line Items] |  |  |
Servicing Asset at Fair Value, Other Changes in Fair Value | $ (80) |  |
Changes in fair value due to interest rate risk | 1 |  |
Net return on mortgage servicing rights | 103 | $ 6 | $ 0
Total (loss) income on mortgage loans subserviced, included in loan administration income | (17) | 3 |
Residential first mortgage loans |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Servicing fees, ancillary income and late fees | 227 | 20 |
Servicing Asset at Fair Value, Other Changes in Fair Value | (80) | (8) |
Changes in fair value due to interest rate risk | 1 | 10 |
Gain on MSR derivatives | (47) | (16) |
Net transaction costs | 2 | 0 |
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 | 154 | 11 |
Charges on subserviced custodial balances | (168) | (8) |
Other servicing charges | (3) | $ 0 |
FDIC Serviced Loans | Loan administration income on mortgage loans subserviced |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Servicing fees, ancillary income and late fees | $ 95 |  |

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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 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 The amount of income earned from subservicing an asset at fair value. + 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 The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(6) -SubTopic 50 -Topic 860 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 + 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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- Definition The increase (decrease) in the fair value of servicing assets that are subsequently measured at fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-3 + Details
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