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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | A summary of amortizing intangible assets follows.
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
December 31, 2024 |  |  |  |  |
Core deposit | $ | 218 |  |  | $ | 131 |  |  | $ | 87 |
Other | 43 |  |  | 36 |  |  | 7 |
Total | $ | 261 |  |  | $ | 167 |  |  | $ | 94 |
December 31, 2023 |  |  |  |  |
Core deposit | $ | 218 |  |  | $ | 90 |  |  | $ | 128 |
Other | 43 |  |  | 24 |  |  | 19 |
Total | $ | 261 |  |  | $ | 114 |  |  | $ | 147 |
Estimated amortization expense in future years for such intangible assets is as follows:
Summary of Estimated Amortization Expense |
(Dollars in millions) |
Year ending December 31: |
2025 | $ | 38 |
2026 | 27 |
2027 | 18 |
2028 | 9 |
2029 | 2 |
| $ | 94 |
Summary of Goodwill Assigned to Reportable Segments for Purposes of Testing for Impairment | A summary of goodwill assigned to each of the Company’s reportable segments at each of December 31, 2024 and 2023 for purposes of testing for impairment is as follows:
(Dollars in millions) |  |  |  |  |
Commercial Bank | $ | 5,076 |  |  |  |  |
Retail Bank | 3,089 |  |  |  |  |
Institutional Services and Wealth Management | 300 |  |  |  |  |
All Other | — |  |  |  |  |
Total | $ | 8,465 |  |  |  |  |

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