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Segmented Information - Operating Segments Earnings (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue [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
Asset retirement obligation accretion 205 190 186
Realized risk management (commodity derivatives) 32 64 (99)
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
Administration 391 344 325
Share-based compensation (82) 223 (146)
Interest and other financing expense 756 836 739
Net unrealized risk management (gain) loss (39) 13 (35)
Foreign exchange (gain) loss (275) (570) 827
Current income tax (recovery) expense (257) 434 374
Deferred income tax expense (recovery) (181) (894) 557
Net earnings (loss) (435) 5,416 2,591
Inter–segment elimination and other      
Revenue [abstract]      
Less: royalties 0 0 0
Revenue 105 496 558
Expenses      
Production 48 56 58
Transportation, blending and feedstock 27 437 491
Depletion, depreciation and amortization 0 0 0
Asset retirement obligation accretion 0 0 0
Realized risk management (commodity derivatives) 0 0 0
Gain on acquisition, disposition and revaluation 0 0 0
Loss from investments 0 0 0
Total expenses 75 493 549
Earnings (loss) before taxes 30 3 9
Inter–segment elimination and other | Other Income And Revenue      
Revenue [abstract]      
Revenue 31 0 0
Inter–segment elimination and other | Crude Oil, Natural Gas Liquids, Natural Gas, Other Income And Revenue      
Revenue [abstract]      
Revenue 105 496 558
Non-segmented      
Expenses      
Loss from investments 171 6 341
Total expenses 974 867 1,962
Administration 391 344 325
Share-based compensation (82) 223 (146)
Interest and other financing expense 756 836 739
Net unrealized risk management (gain) loss 13 28 (124)
Foreign exchange (gain) loss (275) (570) 827
Total Segments      
Revenue [abstract]      
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
Asset retirement obligation accretion 205 190 186
Realized risk management (commodity derivatives) (20) 49 (10)
Gain on acquisition, disposition and revaluation (217) 0 (452)
Loss from investments 0 287 5
Total expenses 16,792 17,048 15,543
Earnings (loss) before taxes 101 5,823 5,484
Total Segments | Other Income And Revenue      
Revenue [abstract]      
Revenue 434 25 0
Total Segments | Crude Oil, Natural Gas Liquids, Natural Gas, Other Income And Revenue      
Revenue [abstract]      
Revenue 17,491 24,394 22,282
North America | Operating segments      
Revenue [abstract]      
Less: royalties (503) (998) (723)
Revenue 8,260 9,837 7,787
Expenses      
Production 2,510 2,425 2,405
Transportation, blending and feedstock 3,393 2,935 2,587
Depletion, depreciation and amortization 3,780 3,326 3,132
Asset retirement obligation accretion 97 95 87
Realized risk management (commodity derivatives) (20) 49 (10)
Gain on acquisition, disposition and revaluation (217) 0 (277)
Loss from investments 0 0 0
Total expenses 9,543 8,830 7,924
Earnings (loss) before taxes (1,283) 1,007 (137)
North America | Operating segments | Other Income And Revenue      
Revenue [abstract]      
Revenue 41 6 0
North America | Operating segments | Crude Oil, Natural Gas Liquids, Natural Gas, Other Income And Revenue      
Revenue [abstract]      
Revenue 8,763 10,835 8,510
North Sea | Operating segments      
Revenue [abstract]      
Less: royalties (1) (2) (2)
Revenue 431 920 891
Expenses      
Production 321 391 405
Transportation, blending and feedstock 15 19 22
Depletion, depreciation and amortization 277 308 257
Asset retirement obligation accretion 30 28 29
Realized risk management (commodity derivatives) 0 0 0
Gain on acquisition, disposition and revaluation 0 0 (139)
Loss from investments 0 0 0
Total expenses 643 746 574
Earnings (loss) before taxes (212) 174 317
North Sea | Operating segments | Other Income And Revenue      
Revenue [abstract]      
Revenue 3 5 0
North Sea | Operating segments | Crude Oil, Natural Gas Liquids, Natural Gas, Other Income And Revenue      
Revenue [abstract]      
Revenue 432 922 893
Offshore Africa | Operating segments      
Revenue [abstract]      
Less: royalties (16) (42) (51)
Revenue 362 665 647
Expenses      
Production 103 109 208
Transportation, blending and feedstock 1 2 2
Depletion, depreciation and amortization 190 242 201
Asset retirement obligation accretion 6 6 9
Realized risk management (commodity derivatives) 0 0 0
Gain on acquisition, disposition and revaluation 0 0 (36)
Loss from investments 0 0 0
Total expenses 300 359 384
Earnings (loss) before taxes 62 306 263
Offshore Africa | Operating segments | Other Income And Revenue      
Revenue [abstract]      
Revenue 18 8 0
Offshore Africa | Operating segments | Crude Oil, Natural Gas Liquids, Natural Gas, Other Income And Revenue      
Revenue [abstract]      
Revenue 378 707 698
Oil Sands Mining and Upgrading | Operating segments      
Revenue [abstract]      
Less: royalties (78) (481) (479)
Revenue 7,450 10,865 11,042
Expenses      
Production 3,114 3,276 3,367
Transportation, blending and feedstock 881 1,306 1,087
Depletion, depreciation and amortization 1,784 1,656 1,557
Asset retirement obligation accretion 72 61 61
Realized risk management (commodity derivatives) 0 0 0
Gain on acquisition, disposition and revaluation 0 0 0
Loss from investments 0 0 0
Total expenses 5,851 6,299 6,072
Earnings (loss) before taxes 1,599 4,566 4,970
Oil Sands Mining and Upgrading | Operating segments | Other Income And Revenue      
Revenue [abstract]      
Revenue 139 6 0
Oil Sands Mining and Upgrading | Operating segments | Crude Oil, Natural Gas Liquids, Natural Gas, Other Income And Revenue      
Revenue [abstract]      
Revenue 7,528 11,346 11,521
Midstream and Refining | Operating segments      
Revenue [abstract]      
Less: royalties 0 0 0
Revenue 285 88 102
Expenses      
Production 184 20 21
Transportation, blending and feedstock 181 0 0
Depletion, depreciation and amortization 15 14 14
Asset retirement obligation accretion 0 0 0
Realized risk management (commodity derivatives) 0 0 0
Gain on acquisition, disposition and revaluation 0 0 0
Loss from investments 0 287 5
Total expenses 380 321 40
Earnings (loss) before taxes (95) (233) 62
Midstream and Refining | Operating segments | Other Income And Revenue      
Revenue [abstract]      
Revenue 202 0 0
Midstream and Refining | Operating segments | Crude Oil, Natural Gas Liquids, Natural Gas, Other Income And Revenue      
Revenue [abstract]      
Revenue 285 88 102
Crude Oil and NGLs | Inter–segment elimination and other      
Revenue [abstract]      
Product sales (108) 351 410
Crude Oil and NGLs | Total Segments      
Revenue [abstract]      
Product sales 15,579 22,950 20,668
Crude Oil and NGLs | North America | Operating segments      
Revenue [abstract]      
Product sales 7,480 9,679 7,254
Crude Oil and NGLs | North Sea | Operating segments      
Revenue [abstract]      
Product sales 417 860 753
Crude Oil and NGLs | Offshore Africa | Operating segments      
Revenue [abstract]      
Product sales 318 632 628
Crude Oil and NGLs | Oil Sands Mining and Upgrading | Operating segments      
Revenue [abstract]      
Product sales 7,389 11,340 11,521
Crude Oil and NGLs | Midstream and Refining | Operating segments      
Revenue [abstract]      
Product sales 83 88 102
Natural gas | Inter–segment elimination and other      
Revenue [abstract]      
Product sales 182 145 148
Natural gas | Total Segments      
Revenue [abstract]      
Product sales 1,478 1,419 1,614
Natural gas | North America | Operating segments      
Revenue [abstract]      
Product sales 1,242 1,150 1,256
Natural gas | North Sea | Operating segments      
Revenue [abstract]      
Product sales 12 57 140
Natural gas | Offshore Africa | Operating segments      
Revenue [abstract]      
Product sales 42 67 70
Natural gas | Oil Sands Mining and Upgrading | Operating segments      
Revenue [abstract]      
Product sales 0 0 0
Natural gas | Midstream and Refining | Operating segments      
Revenue [abstract]      
Product sales 0 $ 0 $ 0
Keystone XL Pipeline Project | Inter–segment elimination and other      
Expenses      
Transportation, blending and feedstock $ 143