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Per Share Amounts - Schedule Representing Per Share Amounts (Details) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Earnings per share [abstract] |  |  |  |
Net Earnings (Loss) | $ 1,286 | $ 820 | $ 2,996 | $ 2,996
Effect of Cumulative Dividends on Preferred Shares | (2) | (9) | (12) | (27)
Net Earnings (Loss) – Basic | 1,284 | 811 | 2,984 | 2,969
Effect of Stock-Based Compensation | 0 | (31) | (1) | 6
Net Earnings (Loss) – Diluted | $ 1,284 | $ 780 | $ 2,983 | $ 2,975
Basic – weighted average number of shares (in shares) | 1,788,901 | 1,848,035 | 1,806,851 | 1,858,364
Dilutive effect of warrants (in shares) | 2,251 | 3,729 | 2,416 | 5,039
Dilutive effect for stock based compensation (in shares) | 1,628 | 11,548 | 1,819 | 9,221
Diluted – weighted average number of shares (in shares) | 1,792,780 | 1,863,312 | 1,811,086 | 1,872,624
Net earnings (loss) per common share — basic (CAD per share) | $ 0.72 | $ 0.44 | $ 1.65 | $ 1.60
Net earnings (loss) per common share — diluted (CAD per share) | $ 0.72 | $ 0.42 | $ 1.65 | $ 1.59

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