Contingent liabilities, contractual commitments and guarantees - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Disclosure of contingent liabilities [line items]
Estimated financial effect of contingent liabilities	$ 120,324	$ 110,019
Amounts due to associates
Disclosure of contingent liabilities [line items]
Estimated financial effect of contingent liabilities	$ 70,900	$ 74,500

The amount of the estimated financial effect of contingent liabilities. [Refer: Classes of contingent liabilities [domain]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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