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Commitments and contingent liabilities - Significant Industry Concentrations Related to Credit Exposure (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | $ 75,195 | $ 71,570
Financial institutions |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 13,038 | $ 13,167
Unfunded commitments | 35,400 |
Total exposure | 48,400 |
Financial institutions | Securities industry |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 3,600 |
Unfunded commitments | 19,500 |
Total exposure | 23,100 |
Financial institutions | Asset managers |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 1,500 |
Unfunded commitments | 8,200 |
Total exposure | 9,700 |
Financial institutions | Banks |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 7,600 |
Unfunded commitments | 1,800 |
Total exposure | 9,400 |
Financial institutions | Insurance |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 100 |
Unfunded commitments | 4,200 |
Total exposure | 4,300 |
Financial institutions | Government |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 0 |
Unfunded commitments | 600 |
Total exposure | 600 |
Financial institutions | Other |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 200 |
Unfunded commitments | 1,100 |
Total exposure | 1,300 |
Commercial |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 1,300 |
Unfunded commitments | 12,400 |
Total exposure | 13,700 |
Commercial | Services and other |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 600 |
Unfunded commitments | 3,900 |
Total exposure | 4,500 |
Commercial | Manufacturing |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 500 |
Unfunded commitments | 3,800 |
Total exposure | 4,300 |
Commercial | Energy and utilities |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 200 |
Unfunded commitments | 3,900 |
Total exposure | 4,100 |
Commercial | Media and telecom |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Loans | 0 |
Unfunded commitments | 800 |
Total exposure | $ 800 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478898/942-825-50-1 + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
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