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Per Share Amounts - Schedule Representing Per Share Amounts (Detail) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Earnings per share [abstract] |  |  |  |
Net Earnings (Loss) | $ 820 | $ 1,864 | $ 2,996 | $ 3,366
Effect of Cumulative Dividends on Preferred Shares | (9) | (9) | (27) | (27)
Net Earnings (Loss) – Basic | 811 | 1,855 | 2,969 | 3,339
Adjustment To Profit (Loss) For Stock Based Compensation, Value | (31) | 0 | 6 | (1)
Net Earnings (Loss) – Diluted | $ 780 | $ 1,855 | $ 2,975 | $ 3,338
Basic – weighted average number of shares (in shares) | 1,848,035 | 1,891,937 | 1,858,364 | 1,900,952
Dilutive effect of warrants (in shares) | 3,729 | 6,408 | 5,039 | 27,491
Dilutive effect for stock based compensation (in shares) | 11,548 | 6,752 | 9,221 | 8,273
Diluted – weighted average number of shares (in shares) | 1,863,312 | 1,905,097 | 1,872,624 | 1,936,716
Net earnings (loss) per share — basic (CAD per share) | $ 0.44 | $ 0.98 | $ 1.60 | $ 1.76
Net earnings (loss) per share — diluted (CAD per share) | $ 0.42 | $ 0.97 | $ 1.59 | $ 1.72

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