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Earnings per share (Details) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Earnings per share [abstract] |  |
Net earnings attributable to common shareholders - basic | $ 6,305 | $ 163
Dividends declared per common share (in cad per share) | $ 2.31 | $ 3.99
Weighted average number of common shares outstanding (in millions) |  |
Weighted average number of common shares outstanding - basic (in shares) | 929,100,000 | 912,300,000
Assumed exercise of stock options (in shares) | 0 | 0
Weighted average number of common shares outstanding - diluted (in shares) | 929,100,000 | 912,300,000
Shares excluded from calculation of earnings per share (in shares) | 5,503,174 | 6,545,819

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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 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 + 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 -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph B12 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B12&doctype=Appendix&subtype=B -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 138 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_138&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 107 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_107&doctype=Standard -URIDate 2025-03-27 + 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 2025-01-01 -Paragraph 70 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_a&doctype=Standard -URIDate 2025-03-27 + Details
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