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Earnings per share (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Earnings per share [abstract]    
Net earnings attributable to common shareholders - basic $ 2,076 $ 2,716
Dividends declared per common share (in cad per share) $ 3.87 $ 3.68
Weighted average number of common shares outstanding (in millions)    
Weighted average number of common shares outstanding - basic (millions) (in shares) 912,200,000 911,500,000
Assumed exercise of stock options (in shares) 0 500,000
Weighted average number of common shares outstanding - diluted (in millions) (in shares) 912,200,000 912,000,000.0
Shares excluded from calculation of earnings per share (in shares) 6,395,513 0