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CONSOLIDATED STATEMENTS OF EARNINGS (LOSS) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue [abstract]      
Product sales $ 17,669 $ 11,098 $ 13,167
Less: royalties (1,018) (575) (804)
Revenue 16,651 10,523 12,363
Expenses      
Production 5,596 4,099 4,726
Transportation, blending and feedstock 2,917 2,003 2,379
Depletion, depreciation and amortization 5,186 4,858 5,483
Administration 319 345 390
Share-based compensation 134 355 (46)
Asset retirement obligation accretion 164 142 173
Interest and other financing expense 631 383 322
Risk management activities 35 33 (469)
Foreign exchange (gain) loss (787) (55) 761
Gain on acquisition, disposition and revaluation of properties (379) (250) (739)
(Gain) loss from investments (38) (327) 50
Total Expenses 13,778 11,586 13,030
Earnings (loss) before taxes 2,873 (1,063) (667)
Current income tax recovery (164) (618) (261)
Deferred income tax expense (recovery) 640 (241) 231
Net earnings (loss) $ 2,397 $ (204) $ (637)
Net earnings (loss) per common share      
Basic earnings (loss) per share $ 2.04 $ (0.19) $ (0.58)
Diluted earnings (loss) per share $ 2.03 $ (0.19) $ (0.58)