Contingencies and commitments - Summary of indemnities and other performance guarantees (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Contingencies And Commitments [Abstract]
Contingent liabilities, indemnities and other performance guarantees	$ 435	$ 498
Contingent liabilities incurred in relation to interests in joint ventures and associates	$ 0	$ 0

The amount of contingent liabilities incurred in relation to interests in joint ventures. [Refer: Contingent liabilities [member]; Joint ventures [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
-Paragraph 23
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_23_b&doctype=Standard
-URIDate 2023-03-23

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