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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, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 442 | $ 417 | $ 860 | $ 814
Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 144 | 137 | 283 | 270
Trust income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 197 | 182 | 380 | 359
Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 35 | 31 | 70 | 63
Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 45 | 46 | 82 | 83
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 21 | 21 | 45 | 39
Commercial Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 78 | 76 | 157 | 148
Commercial Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 46 | 43 | 93 | 88
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 | 2 | 3 | 3
Commercial Bank | Merchant discount and credit card interchange fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 18 | 19 | 33 | 35
Commercial Bank | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 11 | 11 | 26 | 20
Retail Bank |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 133 | 129 | 254 | 245
Retail Bank | Service charges on deposit accounts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 98 | 94 | 190 | 182
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 | 27 | 49 | 48
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 | 231 | 212 | 449 | 421
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 | 196 | 181 | 378 | 357
Institutional Services and Wealth Management | Brokerage services income |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 33 | 29 | 67 | 60
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 | $ 2 | $ 4 | $ 4

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-4 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-14 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-7 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-4 + Details
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