Share capital and premium (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Share Premium [Abstract]
Ordinary shares issued	$ 13	$ 14
Less held Within The Group [Abstract]
Share capital and premium	$ 433		$ 420

The increase in equity through the issue of equity instruments.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 106
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d_iii&doctype=Standard
-URIDate 2023-03-23

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