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Revenue from contracts with customers (Tables) | 6 Months Ended
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Jun. 30, 2026
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 the three-month and six-month periods ended June 30, 2026 and 2025 that are subject to the revenue recognition accounting guidance.
(Dollars in millions) | Commercial Bank |  | Retail Bank |  | Institutional Services and Wealth Management |  | Total
Three Months Ended June 30, 2026 |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 46 |  |  | $ | 98 |  |  | $ | — |  |  | $ | 144 |
Trust income | 1 |  |  | — |  |  | 196 |  |  | 197 |
Brokerage services income | 2 |  |  | — |  |  | 33 |  |  | 35 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 18 |  |  | 27 |  |  | — |  |  | 45 |
Other | 11 |  |  | 8 |  |  | 2 |  |  | 21 |
| $ | 78 |  |  | $ | 133 |  |  | $ | 231 |  |  | $ | 442 |
Three Months Ended June 30, 2025 |  |  |  |  |  |  |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 43 |  |  | $ | 94 |  |  | $ | — |  |  | $ | 137 |
Trust income | 1 |  |  | — |  |  | 181 |  |  | 182 |
Brokerage services income | 2 |  |  | — |  |  | 29 |  |  | 31 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 19 |  |  | 27 |  |  | — |  |  | 46 |
Other | 11 |  |  | 8 |  |  | 2 |  |  | 21 |
| $ | 76 |  |  | $ | 129 |  |  | $ | 212 |  |  | $ | 417 |
Six Months Ended June 30, 2026 |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 93 |  |  | $ | 190 |  |  | $ | — |  |  | $ | 283 |
Trust income | 2 |  |  | — |  |  | 378 |  |  | 380 |
Brokerage services income | 3 |  |  | — |  |  | 67 |  |  | 70 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 33 |  |  | 49 |  |  | — |  |  | 82 |
Other | 26 |  |  | 15 |  |  | 4 |  |  | 45 |
| $ | 157 |  |  | $ | 254 |  |  | $ | 449 |  |  | $ | 860 |
Six Months Ended June 30, 2025 |  |  |  |  |  |  |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 88 |  |  | $ | 182 |  |  | $ | — |  |  | $ | 270 |
Trust income | 2 |  |  | — |  |  | 357 |  |  | 359 |
Brokerage services income | 3 |  |  | — |  |  | 60 |  |  | 63 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 35 |  |  | 48 |  |  | — |  |  | 83 |
Other | 20 |  |  | 15 |  |  | 4 |  |  | 39 |
| $ | 148 |  |  | $ | 245 |  |  | $ | 421 |  |  | $ | 814 |

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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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