Share Capital and Reserves - Summary of Share Premium (Detail) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Share Premium [abstract]
At 1 January	$ 7,493
Reduction of share premium	(7,493)
At 31 December	$ 0

The amount received or receivable from the issuance of the entity's shares in excess of nominal value.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 78
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_e&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_SharePremium
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant