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Earnings per share (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Earnings per share [abstract]    
Net earnings from continuing operations attributable to common shareholders - basic $ 2,709 $ 2,272
Net earnings from discontinued operations attributable to common shareholders - basic 0 226
Net earnings attributable to common shareholders - basic $ 2,709 $ 2,498
Dividends declared per common share (in dollars) (CAD Per Share) $ 3.50 $ 3.33
Weighted average number of common shares outstanding (in millions)    
Weighted average number of common shares outstanding - basic (millions) (in shares) 906,300,000 904,300,000
Assumed exercise of stock options (in shares) 400,000 100,000
Weighted average number of common shares outstanding - diluted (in millions) (in shares) 906,700,000 904,400,000
Shares excluded from calculation of earnings per share (in shares) 3,302,850 10,783,936