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Commitments and contingent liabilities - Summary of Off-Balance Sheet Credit Risks, Net of Participations (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Securities lending indemnifications, joint venture | $ 81,000 | $ 60,000
Invested in reverse repurchase agreements |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Cash collateral invested in indemnified repurchase agreements | 61,000 | 59,000
Lending commitments |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet credit risks | 53,974 | 52,581
Standby letters of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet credit risks | 1,582 | 1,641
Off-balance sheet credit risks participations | 130 | 192
Commercial letters of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet credit risks | 42 | 24
Securities lending indemnifications |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet credit risks | $ 614,049 | $ 544,601

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