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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