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Consolidated Statements of Earnings (Loss) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Profit or loss [abstract]      
Product sales $ 17,491 $ 24,394 $ 22,282
Less: royalties (598) (1,523) (1,255)
Revenue 16,893 22,871 21,027
Expenses      
Production 6,280 6,277 6,464
Transportation, blending and feedstock 4,498 4,699 4,189
Depletion, depreciation and amortization 6,046 5,546 5,161
Administration 391 344 325
Share-based compensation (82) 223 (146)
Asset retirement obligation accretion 205 190 186
Interest and other financing expense 756 836 739
Risk management activities (7) 77 (134)
Foreign exchange (gain) loss (275) (570) 827
Gain on acquisition, disposition and revaluation (217) 0 (452)
Loss from investments 171 293 346
Total expenses 17,766 17,915 17,505
Earnings (loss) before taxes (873) 4,956 3,522
Current income tax (recovery) expense (257) 434 374
Deferred income tax (recovery) expense (181) (894) 557
Net earnings (loss) $ (435) $ 5,416 $ 2,591
Net earnings (loss) per common share      
Basic earnings per share (in CAD per share) $ (0.37) $ 4.55 $ 2.13
Diluted earnings per share (in CAD per share) $ (0.37) $ 4.54 $ 2.12