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Common shares - Calculation of basic and diluted earnings per common share and the dividend declared by the company on its outstanding common shares (Detail) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income (loss) per common share – basic        
Net income (loss) $ 539 $ 1,237 $ 2,776 $ 3,565
Weighted-average number of common shares outstanding (millions of shares) 503.8 530.6 507.3 534.1
Net income (loss) per common share (dollars) $ 1.07 $ 2.33 $ 5.47 $ 6.67
Net income (loss) per common share – diluted        
Net income (loss) $ 539 $ 1,237 $ 2,776 $ 3,565
Weighted-average number of common shares outstanding (millions of shares) 503.8 530.6 507.3 534.1
Effect of employee share-based awards (millions of shares) 1.3 1.3 1.3 1.2
Weighted-average number of common shares outstanding, assuming dilution (millions of shares) 505.1 531.9 508.6 535.3
Net income (loss) per common share (dollars) $ 1.07 $ 2.33 $ 5.46 $ 6.66
Dividends per common share – declared (dollars) $ 0.72 $ 0.60 $ 2.16 $ 1.80