Contingent liabilities, contractual commitments and guarantees - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of contingent liabilities [line items]
Estimated financial effect of contingent liabilities	$ 107,699	$ 114,187
Associates
Disclosure of contingent liabilities [line items]
Estimated financial effect of contingent liabilities	$ 64,800	$ 63,500

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2022-03-24
-Paragraph 86
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_86_a&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_EstimatedFinancialEffectOfContingentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant