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Earnings per share (Details) - CAD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Earnings per share [abstract]    
Net earnings attributable to common shareholders - basic $ 163 $ 2,076
Dividends declared per common share (in cad per share) $ 3.99 $ 3.87
Weighted average number of common shares outstanding (in millions)    
Weighted average number of common shares outstanding - basic (in shares) 912,300,000 912,200,000
Assumed exercise of stock options (in shares) 0 0
Weighted average number of common shares outstanding - diluted (in shares) 912,300,000 912,200,000
Shares excluded from calculation of earnings per share (in shares) 6,545,819 6,395,513