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Earnings (Loss) Per Share - Calculation of Basic and Diluted Earnings Per Share (Details) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Earnings per share [line items]    
Common shareholders' net income (loss) for basic earnings per share $ 3,086 $ 2,871
Add: Increase in income due to convertible instruments 10 10
Common shareholders’ net income (loss) on a diluted basis $ 3,096 $ 2,881
Weighted average number of common shares outstanding for basic earnings per share (in millions) (in shares) 586 586
Add: Dilutive impact of stock options (in millions) (in shares) 0 0
Dilutive impact of convertible instruments (in millions) (in shares) 3 3
Weighted average number of common shares outstanding on a diluted basis (in shares) 589 589
Basic earnings (loss) per share (in CAD per share) $ 5.27 $ 4.90
Diluted earnings (loss) per share (in CAD per share) $ 5.26 $ 4.89
Share options    
Earnings per share [line items]    
Stock options excluded from computation of earnings per share (in shares) 2 1