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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 388 | $ 376 | $ 755 | $ 759
Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 127 | 119 | 251 | 232
Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 170 | 172 | 330 | 366
Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 30 | 25 | 59 | 49
Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 43 | 42 | 80 | 79
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 18 | 18 | 35 | 33
Commercial Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 68 | 64 | 136 | 123
Commercial Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 40 | 36 | 80 | 70
Commercial Bank | Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1 | 1 | 2 | 1
Commercial Bank | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1 | 1 | 3 | 3
Commercial Bank | Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 19 | 19 | 36 | 36
Commercial Bank | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 7 | 7 | 15 | 13
Retail Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 119 | 114 | 230 | 221
Retail Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 87 | 83 | 171 | 162
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 | 24 | 23 | 44 | 43
Retail Bank | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 8 | 8 | 15 | 16
Institutional Services and Wealth Management |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 201 | 198 | 389 | 415
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 | 171 | 328 | 365
Institutional Services and Wealth Management | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 29 | 24 | 56 | 46
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 | $ 3 | $ 5 | $ 4

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