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Revenue from contracts with customers - Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 417 | $ 388 | $ 814 | $ 755
Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 137 | 127 | 270 | 251
Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 182 | 170 | 359 | 330
Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 31 | 30 | 63 | 59
Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 46 | 43 | 83 | 80
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 21 | 18 | 39 | 35
Commercial Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 76 | 68 | 148 | 136
Commercial Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 43 | 40 | 88 | 80
Commercial Bank | Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1 | 1 | 2 | 2
Commercial Bank | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2 | 1 | 3 | 3
Commercial Bank | Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 19 | 19 | 35 | 36
Commercial Bank | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 11 | 7 | 20 | 15
Retail Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 129 | 119 | 245 | 230
Retail Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 94 | 87 | 182 | 171
Retail Bank | Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Retail Bank | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Retail Bank | Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 27 | 24 | 48 | 44
Retail Bank | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 8 | 8 | 15 | 15
Institutional Services and Wealth Management |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 212 | 201 | 421 | 389
Institutional Services and Wealth Management | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Institutional Services and Wealth Management | Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 181 | 169 | 357 | 328
Institutional Services and Wealth Management | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 29 | 29 | 60 | 56
Institutional Services and Wealth Management | Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Institutional Services and Wealth Management | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 2 | $ 3 | $ 4 | $ 5

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