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Revenue from contracts with customers (Tables) | 9 Months Ended
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Sep. 30, 2025
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 nine-month periods ended September 30, 2025 and 2024 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 September 30, 2025 |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 45 |  |  | $ | 96 |  |  | $ | — |  |  | $ | 141 |
Trust income | 1 |  |  | — |  |  | 180 |  |  | 181 |
Brokerage services income | 1 |  |  | — |  |  | 33 |  |  | 34 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 20 |  |  | 27 |  |  | — |  |  | 47 |
Other | 11 |  |  | 7 |  |  | 2 |  |  | 20 |
| $ | 78 |  |  | $ | 130 |  |  | $ | 215 |  |  | $ | 423 |
Three Months Ended September 30, 2024 |  |  |  |  |  |  |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 40 |  |  | $ | 92 |  |  | $ | — |  |  | $ | 132 |
Trust income | 1 |  |  | — |  |  | 169 |  |  | 170 |
Brokerage services income | 2 |  |  | — |  |  | 30 |  |  | 32 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 18 |  |  | 23 |  |  | — |  |  | 41 |
Other | 8 |  |  | 8 |  |  | 3 |  |  | 19 |
| $ | 69 |  |  | $ | 123 |  |  | $ | 202 |  |  | $ | 394 |
(Dollars in millions) | Commercial Bank |  | Retail Bank |  | Institutional Services and Wealth Management |  | Total
Nine Months Ended September 30, 2025 |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 133 |  |  | $ | 278 |  |  | $ | — |  |  | $ | 411 |
Trust income | 3 |  |  | — |  |  | 537 |  |  | 540 |
Brokerage services income | 4 |  |  | — |  |  | 93 |  |  | 97 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 55 |  |  | 75 |  |  | — |  |  | 130 |
Other | 31 |  |  | 22 |  |  | 6 |  |  | 59 |
| $ | 226 |  |  | $ | 375 |  |  | $ | 636 |  |  | $ | 1,237 |
Nine Months Ended September 30, 2024 |  |  |  |  |  |  |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 120 |  |  | $ | 263 |  |  | $ | — |  |  | $ | 383 |
Trust income | 3 |  |  | — |  |  | 497 |  |  | 500 |
Brokerage services income | 5 |  |  | — |  |  | 86 |  |  | 91 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 54 |  |  | 67 |  |  | — |  |  | 121 |
Other | 23 |  |  | 23 |  |  | 8 |  |  | 54 |
| $ | 205 |  |  | $ | 353 |  |  | $ | 591 |  |  | $ | 1,149 |

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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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