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SEGMENTED INFORMATION - Operating Segments Earnings (Details) - 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
Asset retirement obligation accretion 164 142 173
Realized risk management activities (2) 8 (843)
Gain on acquisition, disposition and revaluation of properties (379) (250) (739)
(Gain) loss from investments (38) (327) 50
Administration 319 345 390
Share-based compensation 134 355 (46)
Interest and other financing expense 631 383 322
Net unrealized risk management loss 37 25 374
Foreign exchange (gain) loss (787) (55) 761
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)
Inter–segment elimination and other      
Revenue [abstract]      
Product sales (82) (55) (75)
Less: royalties 0 0 0
Revenue (82) (55) (75)
Expenses      
Production (8) (7) (8)
Transportation, blending and feedstock (85) (68) (75)
Depletion, depreciation and amortization 0 0 0
Asset retirement obligation accretion 0 0 0
Realized risk management activities 0 0 0
Gain on acquisition, disposition and revaluation of properties 0 0 0
(Gain) loss from investments 0 0 0
Total Expenses (93) (75) (83)
Earnings (loss) before taxes 11 20 8
Non-segmented      
Expenses      
Administration 319 345 390
Share-based compensation 134 355 (46)
Interest and other financing expense 631 383 322
Net unrealized risk management loss 37 25 374
Foreign exchange (gain) loss (787) (55) 761
Total Expenses 334 1,053 1,801
Total Segments      
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
Asset retirement obligation accretion 164 142 173
Realized risk management activities (2) 8 (843)
Gain on acquisition, disposition and revaluation of properties (379) (250) (739)
(Gain) loss from investments (38) (327) 50
Total Expenses 13,444 10,533 11,229
Earnings (loss) before taxes 3,207 (10) 1,134
North America | Operating segments      
Revenue [abstract]      
Product sales 9,161 7,209 9,222
Less: royalties (809) (524) (732)
Revenue 8,352 6,685 8,490
Expenses      
Production 2,362 2,186 2,603
Transportation, blending and feedstock 2,291 1,941 2,309
Depletion, depreciation and amortization 3,243 3,465 4,248
Asset retirement obligation accretion 80 66 93
Realized risk management activities (2) 8 (843)
Gain on acquisition, disposition and revaluation of properties (35) (32) (739)
(Gain) loss from investments (7) (320) 6
Total Expenses 7,932 7,314 7,677
Earnings (loss) before taxes 420 (629) 813
North Sea | Operating segments      
Revenue [abstract]      
Product sales 784 570 638
Less: royalties (1) (1) (1)
Revenue 783 569 637
Expenses      
Production 400 403 544
Transportation, blending and feedstock 31 48 61
Depletion, depreciation and amortization 509 458 388
Asset retirement obligation accretion 27 35 39
Realized risk management activities 0 0 0
Gain on acquisition, disposition and revaluation of properties 0 0 0
(Gain) loss from investments 0 0 0
Total Expenses 967 944 1,032
Earnings (loss) before taxes (184) (375) (395)
Offshore Africa | Operating segments      
Revenue [abstract]      
Product sales 632 603 482
Less: royalties (41) (26) (22)
Revenue 591 577 460
Expenses      
Production 226 200 223
Transportation, blending and feedstock 1 2 2
Depletion, depreciation and amortization 205 262 273
Asset retirement obligation accretion 9 12 10
Realized risk management activities 0 0 0
Gain on acquisition, disposition and revaluation of properties 0 0 0
(Gain) loss from investments 0 0 0
Total Expenses 441 476 508
Earnings (loss) before taxes 150 101 (48)
Oil Sands Mining and Upgrading | Operating segments      
Revenue [abstract]      
Product sales 7,072 2,657 2,764
Less: royalties (167) (24) (49)
Revenue 6,905 2,633 2,715
Expenses      
Production 2,600 1,292 1,332
Transportation, blending and feedstock 679 80 82
Depletion, depreciation and amortization 1,220 662 562
Asset retirement obligation accretion 48 29 31
Realized risk management activities 0 0 0
Gain on acquisition, disposition and revaluation of properties (230) 0 0
(Gain) loss from investments 0 0 0
Total Expenses 4,317 2,063 2,007
Earnings (loss) before taxes 2,588 570 708
Midstream | Operating segments      
Revenue [abstract]      
Product sales 102 114 136
Less: royalties 0 0 0
Revenue 102 114 136
Expenses      
Production 16 25 32
Transportation, blending and feedstock 0 0 0
Depletion, depreciation and amortization 9 11 12
Asset retirement obligation accretion 0 0 0
Realized risk management activities 0 0 0
Gain on acquisition, disposition and revaluation of properties (114) (218) 0
(Gain) loss from investments (31) (7) 44
Total Expenses (120) (189) 88
Earnings (loss) before taxes $ 222 $ 303 $ 48