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Earnings Per Common Share (Details) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Net Earnings to Common Shareholders    
Basic EPS $ 1,506 $ 1,330
Potential dilutive effect of stock options (Note 20) 0 0
Diluted EPS $ 1,506 $ 1,330
Weighted Average Shares    
Basic EPS (shares) 486.3 478.6
Potential dilutive effect of stock options (shares) 0.2 0.4
Diluted EPS (shares) 486.5 479.0
EPS    
Basic (CAD per share) $ 3.10 $ 2.78
Diluted (CAD per share) $ 3.10 $ 2.78