v3.25.2
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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net income (loss) per common share – basic        
Net income (loss) $ 949 $ 1,133 $ 2,237 $ 2,328
Weighted-average number of common shares outstanding (millions of shares) 509.0 535.8 509.0 535.8
Net income (loss) per common share (dollars) $ 1.86 $ 2.11 $ 4.39 $ 4.34
Net income (loss) per common share – diluted        
Net income (loss) $ 949 $ 1,133 $ 2,237 $ 2,328
Weighted-average number of common shares outstanding (millions of shares) 509.0 535.8 509.0 535.8
Effect of employee share-based awards (millions of shares) 1.3 1.2 1.2 1.2
Weighted-average number of common shares outstanding, assuming dilution (millions of shares) 510.3 537.0 510.2 537.0
Net income (loss) per common share (dollars) $ 1.86 $ 2.11 $ 4.38 $ 4.34
Dividends per common share – declared (dollars) $ 0.72 $ 0.60 $ 1.44 $ 1.20