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Earnings per share - Summary of Movements in Shares (Details) shares in Millions	6 Months Ended
	Jun. 30, 2023 shares
Reconciliation of number of shares outstanding [abstract]
Number of shares outstanding at beginning of period (in shares)	2,529.0
Net movements in shares under incentive schemes (in shares)	1.5
Shares repurchased under the share buyback programme (in shares)	(15.5)
Number of shares outstanding at end of period (in shares)	2,515.0

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- Definition

The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 79
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_79_a_iv&doctype=Standard
-URIDate 2022-03-24

+ Details

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Period Type:	instant

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- References

No definition available.

+ Details

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- Definition

Decrease In The Number Of Shares Outstanding On Account Of Shares Repurchased.

+ References

No definition available.

+ Details

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- Definition

Increase (decrease) in number of shares outstanding through share-based payment transactions.

+ References

No definition available.

+ Details

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