Financial instruments and risk management - Credit Risk Exposures (Details) - Credit risk - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Derivatives
Credit risk
Maximum exposure	$ 46	$ 56
Cash and cash equivalents
Credit risk
Maximum exposure	$ 557	$ 619

The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 35K
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35K_a&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_MaximumExposureToCreditRisk
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant