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Consolidated shareholders’ equity - Summary of Number of Shares Used to Compute Diluted Earnings Per Share (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share Capital, Reserves And Other Equity Interest [Abstract]
Average number of shares outstanding (in shares)	1,251.7	1,251.9	1,252.5
Adjustment for stock options with dilutive effect (in shares)	0.2	0.3	0.3
Adjustment for restricted shares (in shares)	4.5	4.7	5.1
Average number of shares used to compute diluted earnings per share (in shares)	1,256.4	1,256.9	1,257.9

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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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-Number 33
-IssueDate 2023-01-01
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- Definition

The potential dilutive effect on the weighted average number of 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 2023-01-01
-Paragraph 70
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2023-en-r&anchor=para_70_b&doctype=Standard
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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 2023-01-01
-Paragraph 70
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2023-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2023-03-23

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Dilutive effect of share options on number of restricted shares.

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- Definition

Share Capital, Reserves And Other Equity Interest [Abstract]

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