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Earnings per share (Details) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Earnings per share [abstract] |  |
Net earnings attributable to common shareholders - basic | $ 2,076 | $ 2,716
Dividends declared per common share (in cad per share) | $ 3.87 | $ 3.68
Weighted average number of common shares outstanding (in millions) |  |
Weighted average number of common shares outstanding - basic (millions) (in shares) | 912,200,000 | 911,500,000
Assumed exercise of stock options (in shares) | 0 | 500,000
Weighted average number of common shares outstanding - diluted (in millions) (in shares) | 912,200,000 | 912,000,000.0
Shares excluded from calculation of earnings per share (in shares) | 6,395,513 | 0

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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 -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 + Details
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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 -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 + Details
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- Definition The amount, per share, of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 107 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_107&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2023-01-01 -Paragraph 70 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2023-en-r&anchor=para_70_a&doctype=Standard -URIDate 2023-03-23 + Details
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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 + Details
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