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Goodwill and intangible assets - Intangible Assets by Type (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
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Intangible Assets by Major Class [Line Items] |  |  |  |
Gross carrying amount | $ 4,203 | $ 4,219 |  |
Accumulated amortization | (1,369) | (1,368) |  |
Net carrying amount | 2,834 | 2,851 | $ 2,824 | $ 2,854
Finite-lived Intangible Assets |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Gross carrying amount | 1,615 | 1,643 |  |
Accumulated amortization | (1,369) | (1,368) |  |
Net carrying amount | $ 246 | 275 |  |
Finite-lived Intangible Assets | Weighted Average |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Remaining weighted- average amortization period | 11 years |  |  |
Finite-lived Intangible Assets | Customer contracts—Investment Services | Securities Services |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Gross carrying amount | $ 789 | 779 |  |
Accumulated amortization | (617) | (593) |  |
Net carrying amount | 172 | 186 |  |
Finite-lived Intangible Assets | Customer contracts—Investment Services | Market and Wealth Services |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Gross carrying amount | 269 | 269 |  |
Accumulated amortization | (268) | (266) |  |
Net carrying amount | $ 1 | 3 |  |
Finite-lived Intangible Assets | Customer contracts—Investment Services | Weighted Average | Securities Services |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Remaining weighted- average amortization period | 12 years |  |  |
Finite-lived Intangible Assets | Customer contracts—Investment Services | Weighted Average | Market and Wealth Services |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Remaining weighted- average amortization period | 1 year |  |  |
Finite-lived Intangible Assets | Customer relationships |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Gross carrying amount | $ 517 | 553 |  |
Accumulated amortization | (469) | (495) |  |
Net carrying amount | $ 48 | 58 |  |
Finite-lived Intangible Assets | Customer relationships | Weighted Average |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Remaining weighted- average amortization period | 7 years |  |  |
Finite-lived Intangible Assets | Other |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Gross carrying amount | $ 40 | 42 |  |
Accumulated amortization | (15) | (14) |  |
Net carrying amount | $ 25 | 28 |  |
Finite-lived Intangible Assets | Other | Weighted Average |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Remaining weighted- average amortization period | 11 years |  |  |
Indefinite-lived Intangible Assets |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Gross carrying amount | $ 2,588 | 2,576 |  |
Net carrying amount | 2,588 | 2,576 |  |
Indefinite-lived Intangible Assets | Tradenames |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Gross carrying amount | 1,294 | 1,291 |  |
Net carrying amount | 1,294 | 1,291 |  |
Indefinite-lived Intangible Assets | Customer relationships |  |  |  |
Intangible Assets by Major Class [Line Items] |  |  |  |
Gross carrying amount | 1,294 | 1,285 |  |
Net carrying amount | $ 1,294 | $ 1,285 |  |

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- Definition Intangible Assets by Major Class [Line Items] + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 40 -SubTopic 30 -Topic 350 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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