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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 423 | $ 394 | $ 1,237 | $ 1,149
Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 141 | 132 | 411 | 383
Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 181 | 170 | 540 | 500
Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 34 | 32 | 97 | 91
Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 47 | 41 | 130 | 121
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 20 | 19 | 59 | 54
Commercial Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 78 | 69 | 226 | 205
Commercial Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 45 | 40 | 133 | 120
Commercial Bank | Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1 | 1 | 3 | 3
Commercial Bank | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1 | 2 | 4 | 5
Commercial Bank | Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 20 | 18 | 55 | 54
Commercial Bank | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 11 | 8 | 31 | 23
Retail Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 130 | 123 | 375 | 353
Retail Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 96 | 92 | 278 | 263
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 | 23 | 75 | 67
Retail Bank | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 7 | 8 | 22 | 23
Institutional Services and Wealth Management |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 215 | 202 | 636 | 591
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 | 180 | 169 | 537 | 497
Institutional Services and Wealth Management | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 33 | 30 | 93 | 86
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 | $ 6 | $ 8

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