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Earnings per share (Details) - CAD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings per share [abstract]        
Net earnings attributable to common shareholders - basic $ 596 $ 685 $ 1,473 $ 1,327
Dividends declared per common share (in dollars) (CAD per share) $ 0.9200 $ 0.8750 $ 1.8400 $ 1.7500
Weighted average number of common shares outstanding (in millions)        
Weighted average number of common shares outstanding - basic (in shares) 911,900,000 905,000,000.0 911,000,000.0 904,700,000
Assumed exercise of stock options (in shares) 900,000 300,000 800,000 100,000
Weighted average number of common shares outstanding - diluted (in millions) (in shares) 912,800,000 905,300,000 911,800,000 904,800,000
Shares excluded from calculation of earnings per share (in shares) 0 3,337,131 0 10,458,921