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Revenue from contracts with customers (Tables) | 3 Months Ended
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Mar. 31, 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 periods ended March 31, 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 March 31, 2025 |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 45 |  |  | $ | 88 |  |  | $ | — |  |  | $ | 133 |
Trust income | 1 |  |  | — |  |  | 176 |  |  | 177 |
Brokerage services income | 1 |  |  | — |  |  | 31 |  |  | 32 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 16 |  |  | 21 |  |  | — |  |  | 37 |
Other | 9 |  |  | 7 |  |  | 2 |  |  | 18 |
| $ | 72 |  |  | $ | 116 |  |  | $ | 209 |  |  | $ | 397 |
Three Months Ended March 31, 2024 |  |  |  |  |  |  |
Classification in Consolidated Statement of Income |  |  |  |  |  |  |
Service charges on deposit accounts | $ | 40 |  |  | $ | 84 |  |  | $ | — |  |  | $ | 124 |
Trust income | 1 |  |  | — |  |  | 159 |  |  | 160 |
Brokerage services income | 2 |  |  | — |  |  | 27 |  |  | 29 |
Other revenues from operations: |  |  |  |  |  |  |
Merchant discount and credit card interchange fees | 17 |  |  | 20 |  |  | — |  |  | 37 |
Other | 8 |  |  | 7 |  |  | 2 |  |  | 17 |
| $ | 68 |  |  | $ | 111 |  |  | $ | 188 |  |  | $ | 367 |

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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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