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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 394 | $ 360 | $ 1,149 | $ 1,119
Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 132 | 121 | 383 | 354
Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 170 | 155 | 500 | 521
Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 32 | 27 | 91 | 76
Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 41 | 43 | 121 | 122
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 19 | 14 | 54 | 46
Commercial Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 69 | 67 | 205 | 190
Commercial Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 40 | 38 | 120 | 109
Commercial Bank | Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1 | 0 | 3 | 1
Commercial Bank | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2 | 1 | 5 | 4
Commercial Bank | Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 18 | 21 | 54 | 57
Commercial Bank | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 8 | 7 | 23 | 19
Retail Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 123 | 112 | 353 | 333
Retail Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 92 | 83 | 263 | 245
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 | 23 | 22 | 67 | 65
Retail Bank | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 8 | 7 | 23 | 23
Institutional Services and Wealth Management |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 202 | 181 | 591 | 596
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 | 169 | 155 | 497 | 520
Institutional Services and Wealth Management | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 30 | 26 | 86 | 72
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 | $ 3 | $ 0 | $ 8 | $ 4

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