Share-based payment arrangements - Additional information about share-based payment arrangements (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
share-based compensation
Share-based compensation	$ 32	$ 21	$ 25
Restricted share units
share-based compensation
Share-based compensation	31	19	26
Share option awards
share-based compensation
Share-based compensation	0	1	(3)
Employee share purchase plan
share-based compensation
Share-based compensation	$ 1	$ 1	$ 2

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration