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Earnings per share - Reconciliation between shares used in calculating basic and diluted EPS (Detail) - shares shares in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Earnings per share [abstract]
Weighted average shares used in basic EPS calculation	1,071.2	1,115.2
Dilutive share options outstanding	0.8	1.4
Other potentially issuable shares	18.8	21.2
Weighted average shares used in diluted EPS calculation	1,090.8	1,137.8

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- Definition

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]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2022-03-24
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-URIDate 2022-03-24

+ Details

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X

- Definition

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 33
-IssueDate 2022-03-24
-Paragraph 70
-Subparagraph b
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- References

No definition available.

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 33
-IssueDate 2022-03-24
-Paragraph 70
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2022-en-r&anchor=para_70_b&doctype=Standard
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- Definition

Other potentially issuable shares.

+ References

No definition available.

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