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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
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | $ 397 | $ 367
Service charges on deposit accounts |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 133 | 124
Trust income |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 177 | 160
Brokerage services income |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 32 | 29
Merchant discount and credit card interchange fees |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 37 | 37
Other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 18 | 17
Commercial Bank |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 72 | 68
Commercial Bank | Service charges on deposit accounts |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 45 | 40
Commercial Bank | Trust income |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 1 | 1
Commercial Bank | Brokerage services income |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 1 | 2
Commercial Bank | Merchant discount and credit card interchange fees |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 16 | 17
Commercial Bank | Other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 9 | 8
Retail Bank |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 116 | 111
Retail Bank | Service charges on deposit accounts |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 88 | 84
Retail Bank | Trust income |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Retail Bank | Brokerage services income |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Retail Bank | Merchant discount and credit card interchange fees |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 21 | 20
Retail Bank | Other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 7 | 7
Institutional Services and Wealth Management |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 209 | 188
Institutional Services and Wealth Management | Service charges on deposit accounts |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Institutional Services and Wealth Management | Trust income |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 176 | 159
Institutional Services and Wealth Management | Brokerage services income |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 31 | 27
Institutional Services and Wealth Management | Merchant discount and credit card interchange fees |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Institutional Services and Wealth Management | Other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contract with customer | $ 2 | $ 2

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