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Mortgage Servicing Rights (Tables) | 3 Months Ended
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Mar. 31, 2024
Transfers and Servicing [Abstract] |
Schedule of Changes in the Fair Value of Residential First Mortgage MSRs | Changes in the fair value of residential first mortgage MSRs were as follows:
| Three Months Ended,
(in millions) | March 31, 2024 | March 31, 2023
Balance at beginning of period | $ | 1,111 |  | $ | 1,033 |
Additions from loans sold with servicing retained | 42 |  | 38 |
Reductions from sales | (69) |  | — |
Decrease in MSR fair value due to pay-offs, pay-downs, run-off, model changes, and other (1) | (26) |  | (18) |
Changes in estimates of fair value due to interest rate risk (1) (2) | 34 |  | (19) |
Fair value of MSRs at end of period | $ | 1,092 |  | $ | 1,034 |
(1)Changes in fair value are included within net return on mortgage servicing rights on the Consolidated Statements of Income and Comprehensive Income. (2)Represents estimated MSR value change resulting primarily from market-driven changes which we manage through the use of derivatives.
Summary of Adverse Changes to Weighted-Average Assumptions on the Fair Value of Servicing Rights | The following table summarizes the hypothetical resulting fair value of servicing rights using adverse changes of 10 percent and 20 percent to the weighted average of certain significant assumptions used in valuing these assets:
| March 31, 2024
|  | Fair Value
(dollars in millions) | Actual | 10% adverse change | 20% adverse change
Option adjusted spread | 5.3 | % | $ | 1,072 |  | $ | 1,053 |
Constant prepayment rate | 7.7 | % | 1,054 |  | 1,020 |
Weighted average cost to service per loan | $ | 68 |  | $ | 1,081 |  | $ | 1,071 |
| December 31, 2023
|  | Fair Value
(dollars in millions) | Actual | 10% adverse change | 20% adverse change
Option adjusted spread | 5.4 | % | $ | 1,091 |  | $ | 1,072 |
Constant prepayment rate | 7.9 | % | 1,073 |  | 1,040 |
Weighted average cost to service per loan | $ | 69 |  | $ | 1,100 |  | $ | 1,090 |
Summary of Income and Fees | The following table summarizes income and fees associated with owned MSRs:
| Three Months Ended,
(in millions) | March 31, 2024 | March 31, 2023
Net return on mortgage servicing rights |  |
Servicing fees, ancillary income and late fees (1) | $ | 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 (2) | (44) |  | 3 |
Net transaction costs | (1) |  | (1) |
Total return (loss) included in net return on mortgage servicing rights | $ | 21 |  | $ | 21 |
(1)Servicing fees are recorded on an accrual basis. Ancillary income and late fees are recorded on a cash basis. (2)Changes in the derivatives utilized as economic hedges to offset changes in fair value of the MSRs. The following table summarizes income and fees associated with our mortgage loans subserviced for others:
| Three Months Ended,
(in millions) | March 31, 2024 | March 31, 2023
Loan administration income on mortgage loans subserviced |  |
Servicing fees, ancillary income and late fees (1) | $ | 37 |  | $ | 36 |
Charges on subserviced custodial balances (2) | (36) | (29)
Other servicing charges | 1 | (1)
Total income (loss) on mortgage loans subserviced, included in loan administration income | $ | 2 |  | $ | 6 |
(1)Servicing fees are recorded on an accrual basis. Ancillary income and late fees are recorded on a cash basis. (2)Charges on subserviced custodial balances represent interest due to MSR owner.

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- Definition Tabular disclosure of contractual servicing fees, including late fees and ancillary income, for each type of loan serviced. + References No definition available. + Details
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- Definition Tabular disclosure of a sensitivity analysis or stress test showing the hypothetical effect on the fair value of the transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) of two or more unfavorable variations from the expected levels for each key assumption that is reported, independently determined from any change in another key assumption, and a description of the objectives, methodology, and limitations of the sensitivity analysis or stress test. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
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- Definition Tabular disclosure of the activity in the balance of servicing assets (including a description of where changes in fair value are reported in the statement of income for each period for which results of operations are presented), including but not limited to, the following: beginning and ending balances, additions (for instance, through purchases of servicing assets), disposals, changes in fair value during the period resulting from changes in inputs or assumptions used in the valuation model, other changes in fair value along with a description of those changes, and other changes that affect the balance along with a description of those changes. + 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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