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Mortgage Servicing Assets (Tables) | 6 Months Ended
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Jun. 30, 2026
Servicing Asset [Abstract] |
Schedule of Changes in Carrying Amount of Mortgage Servicing Assets | Changes in the carrying amount of commercial mortgage servicing assets are summarized as follows:
| Three months ended June 30, |  | Six months ended June 30,
Dollars in millions | 2026 | 2025 |  | 2026 | 2025
Balance at beginning of period | $ | 572 |  | $ | 597 |  |  | $ | 577 |  | $ | 609 |
Servicing retained from loan sales | 12 |  | 17 |  |  | 34 |  | 32 |
Purchases | — |  | 4 |  |  | 4 |  | 8 |
Amortization | (32) |  | (31) |  |  | (63) |  | (62) |
Balance at end of period | $ | 552 |  | $ | 587 |  |  | $ | 552 |  | $ | 587 |
Fair value at end of period | $ | 777 |  | $ | 787 |  |  | $ | 777 |  | $ | 787 |
Changes in the carrying amount of residential mortgage servicing assets are summarized as follows:
| Three months ended June 30, |  | Six months ended June 30,
Dollars in millions | 2026 | 2025 |  | 2026 | 2025
Balance at beginning of period | $ | 114 |  | $ | 111 |  |  | $ | 112 |  | $ | 111 |
Servicing retained from loan sales | 4 |  | 4 |  |  | 9 |  | 7 |
Amortization | (4) |  | (3) |  |  | (7) |  | (6) |
Balance at end of period | $ | 114 |  | $ | 112 |  |  | $ | 114 |  | $ | 112 |
Fair value at end of period | $ | 140 |  | $ | 136 |  |  | $ | 140 |  | $ | 136 |
Schedule of Range and Weighted-Average of Significant Unobservable Inputs | The sensitivity, range, and weighted average of the significant unobservable inputs used to determine the fair value of our commercial mortgage servicing assets at June 30, 2026, and December 31, 2025, along with the valuation techniques, are shown in the following table:
|  | June 30, 2026 |  | December 31, 2025
| Significant Unobservable Input | Range | Weighted Average |  | Range | Weighted Average
| Escrow earn rate | 4.42 | % | 4.59 | % | 4.58 | % |  | 3.94 | % | 4.09 | % | 4.08 | %
| Effect on fair value from 10% adverse change |  |  | $ | (32) |  |  |  |  | $ | (29) |
| Effect on fair value from 20% adverse change |  |  | (65) |  |  |  |  | (57) |
| Residual cash flows discount rate | 7.01 | % | 10.74 | % | 10.46 | % |  | 6.96 | % | 10.84 | % | 10.58 | %
| Effect on fair value from 10% adverse change |  |  | $ | (19) |  |  |  |  | $ | (19) |
| Effect on fair value from 20% adverse change |  |  | (37) |  |  |  |  | (36) |
| Expected defaults | 1.00 | % | 1.50 | % | 1.04 | % |  | 1.00 | % | 2.00 | % | 1.01 | %
| Effect on fair value from 10% adverse change |  |  | $ | (2) |  |  |  |  | $ | (2) |
| Effect on fair value from 20% adverse change |  |  | (4) |  |  |  |  | (3) |
| Loan assumption rate | 8.00 | % | 45.00 | % | 9.78 | % |  | 8.00 | % | 45.00 | % | 10.05 | %
| Effect on fair value from 10% adverse change |  |  | $ | (7) |  |  |  |  | $ | (6) |
| Effect on fair value from 20% adverse change |  |  | (14) |  |  |  |  | (13) |
The sensitivity, range, and weighted-average of the significant unobservable inputs used to fair value our mortgage servicing assets at June 30, 2026, and December 31, 2025, along with the valuation techniques, are shown in the following table:
|  | June 30, 2026 |  | December 31, 2025
| Significant Unobservable Input | Range | Weighted Average |  | Range | Weighted Average
| Prepayment speed | 5.57 | % | 32.55 | % | 8.06 | % |  | 6.01 | % | 33.07 | % | 8.33 | %
| Effect on Fair Value of a 10% adverse change |  |  | $ | (4) |  |  |  |  | $ | (4) |
| Effect on Fair Value of a 20% adverse change |  |  | (8) |  |  |  |  | (8) |
| Discount rate | 6.50 | % | 8.75 | % | 6.62 | % |  | 6.50 | % | 8.75 | % | 6.62 | %
| Effect on Fair Value of a 10% adverse change |  |  | $ | (4) |  |  |  |  | $ | (4) |
| Effect on Fair Value of a 20% adverse change |  |  | (7) |  |  |  |  | (7) |
| Servicing cost | $ | 70.00 |  | $ | 4,332 |  | $ | 75.96 |  |  | $ | 70.00 |  | $ | 4,332 |  | $ | 76.47 |
Schedule of Assumptions and Information for Originated Mortgage Servicing Right Additions | Assumptions and information for originated commercial mortgage servicing right additions for the six-month period ended June 30, 2026 are shown in the following table:
Dollars in millions | June 30, 2026 |
Unpaid principal balance of loans sold during the period | $ | 3,118 |  |
Pretax gains related to the sale of mortgage loans | 53 |  |
Weighted average servicing fee rate | 0.16 | % |
Weighted average assumptions: |  |
Escrow earn rate assumption | 4.28 | % |
Discount rate assumption | 9.77 | % |
Default rate assumption | 1.03 | % |
Prepayment rate assumption | 11.94 | % |

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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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