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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
Mar. 31, 2022
Mar. 31, 2021
Net income (loss) per common share - basic    
Net income (loss) (millions of Canadian dollars) $ 1,173 $ 392
Weighted average number of common shares outstanding (millions of shares) 670.5 734.1
Net income (loss) per common share (dollars) $ 1.75 $ 0.53
Net income (loss) per common share - diluted    
Net income (loss) (millions of Canadian dollars) $ 1,173 $ 392
Weighted average number of common shares outstanding (millions of shares) 670.5 734.1
Effect of employee share-based awards (millions of shares) 1.4 1.6
Weighted average number of common shares outstanding, assuming dilution (millions of shares) 671.9 735.7
Net income (loss) per common share (dollars) $ 1.75 $ 0.53
Dividends per common share - declared (dollars) $ 0.34 $ 0.22