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Per Share Amounts - Schedule Representing Per Share Amounts (Detail) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Earnings per share [abstract] |  |
Net Earnings (Loss) | $ 3,142 | $ 4,109
Effect of Cumulative Dividends on Preferred Shares | (36) | (36)
Net Earnings (Loss) – Basic | 3,106 | 4,073
Effect of Stock-Based Compensation | 3 | (12)
Net Earnings (Loss) – Diluted | $ 3,109 | $ 4,061
Basic – Weighted Average Number of Shares (in shares) | 1,850,193 | 1,895,487
Dilutive Effect of Warrants (in shares) | 4,483 | 22,223
Dilutive effect for stock based compensation (in shares) | 8,540 | 22,135
Diluted - Weighted Average Number of Shares (in shares) | 1,863,216 | 1,939,845
Net Earnings (Loss) Per Share — Basic (in CAD per share) | $ 1.68 | $ 2.15
Net Earnings (Loss) Per Share — Diluted (in CAD per share) | $ 1.67 | $ 2.09

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