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Description of Business and Segmented Disclosures - Schedule of Segment and Operational Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues |  |  |
Gross Sales | $ 13,591 | $ 21,353 | $ 21,389
Less: Royalties | 364 | 1,173 | 546
Revenue | 13,227 | 20,180 | 20,843
Expenses |  |  |
Purchased Product | 5,119 | 8,378 | 8,684
Transportation and Blending | 4,444 | 5,184 | 5,942
Operating | 1,930 | 2,088 | 2,184
Inventory Write-Down (Reversal) | 555 | 49 | 60
(Gain) Loss on Risk Management | 308 | 156 | 305
Depreciation, Depletion and Amortization | 3,464 | 2,249 | 2,131
Exploration Expense | 91 | 82 | 2,123
Segment Income (Loss) | (2,684) | 1,994 | (586)
General and Administrative | 292 | 331 | 1,020
Finance Costs | 536 | 511 | 627
Interest Income | (9) | (12) | (19)
Transaction Costs | 29 |  |
Foreign Exchange (Gain) Loss, Net | (181) | (404) | 854
Re-measurement of Contingent Payment | (80) | 164 | 50
(Gain) Loss on Divestiture of Assets | (81) | (2) | 795
Other (Income) Loss, Net | 40 | 9 | 13
Total Non-operating (Income) Expense | 546 | 597 | 3,340
Earnings (Loss) From Continuing Operations Before Income Tax | (3,230) | 1,397 | (3,926)
Income Tax Expense (Recovery) | (851) | (797) | (1,010)
Net Earnings (Loss) From Continuing Operations | (2,379) | 2,194 | (2,916)
Oil Sands [Member] |  |  |
Revenues |  |  |
Gross Sales | 7,514 | 10,838 | 10,026
Less: Royalties | 324 | 1,143 | 473
Revenue | 7,190 | 9,695 | 9,553
Expenses |  |  |
Transportation and Blending | 4,399 | 5,152 | 5,879
Operating | 1,094 | 1,039 | 1,037
Inventory Write-Down (Reversal) | 316 |  |
(Gain) Loss on Risk Management | 268 | 23 | 1,551
Operating Margin | 1,113 | 3,481 | 1,086
Depreciation, Depletion and Amortization | 1,684 | 1,543 | 1,439
Exploration Expense | 9 | 18 | 6
Segment Income (Loss) | (580) | 1,920 | (359)
Conventional [Member] |  |  |
Revenues |  |  |
Gross Sales | 635 | 691 | 904
Less: Royalties | 40 | 30 | 73
Revenue | 595 | 661 | 831
Expenses |  |  |
Transportation and Blending | 81 | 82 | 90
Operating | 318 | 337 | 403
(Gain) Loss on Risk Management |  |  | 26
Operating Margin | 196 | 242 | 312
Depreciation, Depletion and Amortization | 880 | 319 | 412
Exploration Expense | 82 | 64 | 2,117
Segment Income (Loss) | (766) | (141) | (2,217)
Refining and Marketing [Member] |  |  |
Revenues |  |  |
Gross Sales | 6,051 | 10,513 | 11,183
Revenue | 6,051 | 10,513 | 11,183
Expenses |  |  |
Purchased Product | 5,397 | 8,795 | 9,201
Operating | 824 | 948 | 927
Inventory Write-Down (Reversal) | 239 | 49 | 60
(Gain) Loss on Risk Management | (21) | (16) | (1)
Operating Margin | (388) | 737 | 996
Depreciation, Depletion and Amortization | 739 | 280 | 222
Segment Income (Loss) | (1,127) | 457 | 774
Corporate and Eliminations [Member] |  |  |
Revenues |  |  |
Gross Sales | (609) | (689) | (724)
Revenue | (609) | (689) | (724)
Expenses |  |  |
Purchased Product | (278) | (417) | (517)
Transportation and Blending | (36) | (50) | (27)
Operating | (306) | (236) | (183)
(Gain) Loss on Risk Management | 61 | 149 | (1,271)
Depreciation, Depletion and Amortization | 161 | 107 | 58
Segment Income (Loss) | (211) | (242) | 1,216
General and Administrative | 292 | 331 | 1,020
Finance Costs | 536 | 511 | 627
Interest Income | (9) | (12) | (19)
Transaction Costs | 29 |  |
Foreign Exchange (Gain) Loss, Net | (181) | (404) | 854
Re-measurement of Contingent Payment | (80) | 164 | 50
(Gain) Loss on Divestiture of Assets | (81) | (2) | 795
Other (Income) Loss, Net | 40 | 9 | 13
Total Non-operating (Income) Expense | $ 546 | $ 597 | $ 3,340

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