Group assets and liabilities - Assets and liabilities held for sale (Details) - Assets and liabilities held for sale $ in Millions	12 Months Ended
Dec. 31, 2024 USD ($)
Other assets
Gain (loss) on remeasurement to fair value less costs to sell	$ (71)
Increase (decrese) in equity from remeasurement to fair value less costs to sell	$ (27)

The gain (loss) recognised on the measurement to fair value less costs to sell or on the disposal of the assets or disposal group(s) constituting the discontinued operation. [Refer: Discontinued operations [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2024-01-01
-Paragraph 33
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2024-en-r&anchor=para_33_b_iii&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration