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Earnings per share (Details) - CAD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Earnings per share [abstract]        
Net earnings attributable to common shareholders - basic $ 558 $ 579 $ 1,174 $ 1,209
Dividends declared per common share (in dollars) (CAD per share) $ 0.4375 $ 0.4375 $ 0.8750 $ 1.4350
Weighted average number of common shares outstanding (in millions)        
Weighted average number of common shares outstanding - basic (in shares) 932,500,000 930,900,000 932,500,000 925,600,000
Assumed exercise of stock options (in shares) 0 0 0 0
Weighted average number of common shares outstanding - diluted (in millions) (in shares) 932,500,000 930,900,000 932,500,000 925,600,000
Shares excluded from calculation of earnings per share (in shares) 8,762,229 5,503,174 8,762,229 5,503,174