Earnings per share ("EPS") - Reconciliation Between Shares Used in Calculating Basic and Diluted EPS (Details) - shares shares in Millions	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Earnings per share [abstract]
Weighted average shares used in basic EPS calculation (shares)	1,077	1,077
Other potentially issuable shares (shares)	21	16
Weighted average shares used in diluted EPS calculation (shares)	1,098	1,093

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 33
-IssueDate 2025-01-01
-Paragraph 70
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2025-03-27

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration