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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net income (loss) per common share - basic        
Net income (loss) (millions of Canadian dollars) $ 3 $ 424 $ (711) $ 1,929
Weighted average number of common shares outstanding (millions of shares) 734.1 757.8 735.7 767.6
Net income (loss) per common share (dollars) $ 0 $ 0.56 $ (0.97) $ 2.51
Net income (loss) per common share - diluted        
Net income (loss) (millions of Canadian dollars) $ 3 $ 424 $ (711) $ 1,929
Weighted average number of common shares outstanding (millions of shares) 734.1 757.8 735.7 767.6
Effect of employee share-based awards (millions of shares) [1] 2.2 2.5 0.0 2.4
Weighted average number of common shares outstanding, assuming dilution (millions of shares) 736.3 760.3 735.7 770.0
Net income (loss) per common share (dollars) $ 0 $ 0.56 $ (0.97) $ 2.51
Dividends per common share - declared (dollars) $ 0.22 $ 0.22 $ 0.66 $ 0.63
[1] For Nine Months to September 30, 2020, the Net income (loss) per common share – diluted excludes the effect of 2.1 million employee share-based awards. Share-based awards have the potential to dilute basic earnings per share in the future.