Other Non-Current Assets - Summary of Other Non-Current Assets (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
HM Revenue And Customs [Member]
Disclosure Of Other Non-current Assets Table [line items]
Tax receivable	$ 94	$ 96

The non-current amount of current tax assets. [Refer: Current tax assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 54
-Subparagraph n
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_n&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_CurrentTaxAssetsNoncurrent
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant