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Revenue from contracts with customers (Tables) | 12 Months Ended
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Dec. 31, 2024
Revenue from Contract with Customer [Abstract] |
Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance | The following tables summarize sources of the Company’s noninterest income during 2024, 2023 and 2022 that are subject to the revenue recognition guidance.
(Dollars in millions) | Commercial Bank |  | Retail Bank |  | Institutional Services and Wealth Management |  | Total
Year Ended December 31, 2024 |  |  |  |  |  |  |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 160 |  |  | $ | 353 |  |  | $ | 1 |  |  | $ | 514 |
Trust income | 3 |  |  | — |  |  | 672 |  |  | 675 |
Brokerage services income | 6 |  |  | — |  |  | 115 |  |  | 121 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 74 |  |  | 88 |  |  | — |  |  | 162 |
Other | 29 |  |  | 30 |  |  | 10 |  |  | 69 |
| $ | 272 |  |  | $ | 471 |  |  | $ | 798 |  |  | $ | 1,541 |
Year Ended December 31, 2023 |  |  |  |  |  |  |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 144 |  |  | $ | 330 |  |  | $ | 1 |  |  | $ | 475 |
Trust income | 2 |  |  | — |  |  | 678 |  |  | 680 |
Brokerage services income | 6 |  |  | — |  |  | 96 |  |  | 102 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 77 |  |  | 84 |  |  | — |  |  | 161 |
Other | 28 |  |  | 30 |  |  | 8 |  |  | 66 |
| $ | 257 |  |  | $ | 444 |  |  | $ | 783 |  |  | $ | 1,484 |
Year Ended December 31, 2022 |  |  |  |  |  |  |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 130 |  |  | $ | 317 |  |  | $ | — |  |  | $ | 447 |
Trust income | — |  |  | — |  |  | 741 |  |  | 741 |
Brokerage services income | 5 |  |  | — |  |  | 83 |  |  | 88 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 73 |  |  | 86 |  |  | — |  |  | 159 |
Other | 24 |  |  | 28 |  |  | 38 |  |  | 90 |
| $ | 232 |  |  | $ | 431 |  |  | $ | 862 |  |  | $ | 1,525 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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