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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