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Earnings per share (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Earnings per share [abstract]    
Net earnings from continuing operations $ 2,272 $ 3,011
Net earnings from discontinued operations 226 29
Net earnings attributable to common shareholders - basic $ 2,498 $ 3,040
Dividends declared per common share (in dollars) (CAD Per Share) $ 3.33 $ 3.17
Weighted average number of common shares outstanding (in millions)    
Weighted average number of common shares outstanding - basic (millions) (in shares) 904,300,000 900,800,000
Assumed exercise of stock options (in shares) 100,000 600,000
Weighted average number of common shares outstanding - diluted (in millions) (in shares) 904,400,000 901,400,000
Shares excluded from calculation of earnings per share (in shares) 10,783,936 61,170