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Capitalized servicing assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Transfers and Servicing [Abstract] |
Servicing Asset at Amortized Cost | Changes in capitalized servicing assets were as follows:
| Year Ended December 31,
| Residential Mortgage Loans |  | Commercial Mortgage Loans
(Dollars in millions) | 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Beginning balance | $ | 456 |  |  | $ | 194 |  |  | $ | 241 |  |  | $ | 123 |  |  | $ | 126 |  |  | $ | 133 |
Originations | 20 |  |  | 13 |  |  | 7 |  |  | 34 |  |  | 27 |  |  | 24 |
Purchases | — |  |  | 350 |  |  | — |  |  | — |  |  | — |  |  | — |
Acquired in business combination | — |  |  | — |  |  | 12 |  |  | — |  |  | — |  |  | — |
Amortization | (108) |  |  | (101) |  |  | (66) |  |  | (31) |  |  | (30) |  |  | (31) |
| 368 |  |  | 456 |  |  | 194 |  |  | 126 |  |  | 123 |  |  | 126 |
Valuation allowance | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Ending balance, net | $ | 368 |  |  | $ | 456 |  |  | $ | 194 |  |  | $ | 126 |  |  | $ | 123 |  |  | $ | 126 |
| Residential Mortgage Loans |  | Commercial Mortgage Loans
(Dollars in millions) | 2024 |  | 2023 |  | 2024 |  | 2023
Balances at period end |  |  |  |  |  |  |
Loans serviced for others | $ | 38,105 |  |  | $ | 40,021 |  |  | $ | 27,474 |  |  | $ | 24,157 |
Loans sub-serviced for others | 111,544 |  |  | 115,321 |  |  | 4,063 |  |  | 3,873 |
Total loans serviced for others | $ | 149,649 |  |  | $ | 155,342 |  |  | $ | 31,537 |  |  | $ | 28,030 |
Economic Assumptions Used to Determine Fair Value of Capitalized Servicing Rights and Sensitivity of Value to Changes in Assumptions |
(Dollars in millions) | Residential |  | Commercial
Weighted-average prepayment speeds | 6.44 | % |  |
Impact on fair value of 10% adverse change | $ | (14) |  |  |
Impact on fair value of 20% adverse change | (28) |  |  |
Weighted-average OAS | 7.58 | % |  |
Impact on fair value of 10% adverse change | $ | (17) |  |  |
Impact on fair value of 20% adverse change | (33) |  |  |
Weighted-average discount rate |  |  | 12.80 | %
Impact on fair value of 10% adverse change |  |  | $ | (5) |
Impact on fair value of 20% adverse change |  |  | (10) |

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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 activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-4 + Details
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- References No definition available. + Details
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