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Per Share Amounts - Schedule Representing Per Share Amounts (Detail) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings (Loss) From:      
Continuing Operations $ (2,379) $ 2,194 $ (2,916)
Discontinued Operations     247
Net Earnings (Loss) $ (2,379) $ 2,194 $ (2,669)
Basic – Weighted Average Number of Shares 1,228.9 1,228.8 1,228.8
Dilutive Effect of Cenovus Net Settlement Rights   0.6 0.4
Diluted – Weighted Average Number of Shares 1,228.9 1,229.4 1,229.2
Basic and Diluted Earnings (Loss) Per Share ($)      
Continuing Operations $ (1.94) $ 1.78 $ (2.37)
Discontinued Operations     0.20
Net Earnings (Loss) Per Share $ (1.94) $ 1.78 $ (2.17)