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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenues      
Gross Sales $ 71,765 $ 48,811 [1] $ 13,914 [1]
Less: Royalties 4,868 2,454 [1] 371 [1]
Revenues 66,897 46,357 [1] 13,543 [1]
Expenses      
Purchased Product 33,801 23,326 [1] 5,681 [1]
Transportation and Blending 11,530 8,038 [1] 4,728 [1]
Operating 5,569 4,716 [1] 1,955 [1]
(Gain) Loss on Risk Management 1,636 995 [1] 308 [1]
Depreciation, Depletion and Amortization 4,679 5,886 [1] 3,464 [1]
Exploration Expense 101 18 [1] 91 [1]
(Income) Loss From Equity-Accounted Affiliates (15) (57) 0
Segment Income (Loss) 9,596 3,435 (2,684)
General and Administrative 865 849 [1] 292 [1]
Finance Costs 820 1,082 [1] 536 [1]
Interest Income (81) (23) [1] (9) [1]
Integration and Transaction Costs 106 349 [1] 29 [1]
Foreign Exchange (Gain) Loss, Net 343 (174) [1] (181) [1]
Revaluation (Gains) (549) 0 0
Re-measurement of Contingent Payment 162 575 [1] (80) [1]
Gains (losses) on disposals of non-current assets (269) (229) [1] (81) [1]
Other (Income) Loss, Net (532) (309) [1] 40 [1]
Total Non-operating (Income) Expense 865 2,120 546
Earnings (Loss) Before Income Tax 8,731 1,315 [1] (3,230) [1]
Income Tax Expense (Recovery) 2,281 728 [1] (851) [1]
Net Earnings (Loss) 6,450 587 [1] (2,379) [1]
Realized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 1,762 993 252
Unrealized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management (126) 2 56
Upstream      
Revenues      
Gross Sales 41,127 27,844 9,708
Less: Royalties 4,868 2,454 371
Revenues 36,259 25,390 9,337
Expenses      
Purchased Product 6,833 4,059 1,530
Transportation and Blending 12,194 8,714 4,764
Operating 3,789 3,241 1,476
Operating Margin 11,824 8,588 1,299
Depreciation, Depletion and Amortization 3,718 3,161 2,567
Exploration Expense 101 18 91
(Income) Loss From Equity-Accounted Affiliates (15) (52) 0
Segment Income (Loss) 8,075 5,442 (1,416)
Upstream | Realized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 1,619 788 268
Upstream | Unrealized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management (55) 19 57
Downstream      
Revenues      
Gross Sales 38,102 26,258 4,815
Less: Royalties 0 0 0
Revenues 38,102 26,258 4,815
Expenses      
Purchased Product 32,501 23,111 4,429
Transportation and Blending 0 0 0
Operating 3,050 2,258 785
Operating Margin 2,439 785 (378)
Depreciation, Depletion and Amortization 848 2,607 736
Exploration Expense 0 0 0
(Income) Loss From Equity-Accounted Affiliates 0 0 0
Segment Income (Loss) 1,573 (1,823) (1,113)
Downstream | Realized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 112 104 (21)
Downstream | Unrealized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 18 1 (1)
Oil Sands      
Expenses      
Purchased Product   2,404  
Transportation and Blending   8,625  
Oil Sands | Upstream      
Revenues      
Gross Sales 34,775 22,827 8,804
Less: Royalties 4,493 2,196 331
Revenues 30,282 20,631 8,473
Expenses      
Purchased Product 4,810 2,404 1,262
Transportation and Blending 12,036 8,625 4,683
Operating 2,930 2,451 1,156
Operating Margin 8,979 6,365 1,104
Depreciation, Depletion and Amortization 2,763 2,666 1,687
Exploration Expense 9 16 9
(Income) Loss From Equity-Accounted Affiliates 8 (5) 0
Segment Income (Loss) 6,267 3,670 (649)
Oil Sands | Upstream | Realized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 1,527 786 268
Oil Sands | Upstream | Unrealized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management (68) 18 57
Conventional | Upstream      
Revenues      
Gross Sales 4,332 3,235 904
Less: Royalties 298 150 40
Revenues 4,034 3,085 864
Expenses      
Purchased Product 2,023 1,655 268
Transportation and Blending 143 74 81
Operating 541 551 320
Operating Margin 1,235 803 195
Depreciation, Depletion and Amortization 370 3 880
Exploration Expense 1 (3) 82
(Income) Loss From Equity-Accounted Affiliates 0 0 0
Segment Income (Loss) 851 802 (767)
Conventional | Upstream | Realized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 92 2 0
Conventional | Upstream | Unrealized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 13 1 0
Offshore | Upstream      
Revenues      
Gross Sales 2,020 1,782 0
Less: Royalties 77 108 0
Revenues 1,943 1,674 0
Expenses      
Purchased Product 0 0 0
Transportation and Blending 15 15 0
Operating 318 239 0
Operating Margin 1,610 1,420 0
Depreciation, Depletion and Amortization 585 492 0
Exploration Expense 91 5 0
(Income) Loss From Equity-Accounted Affiliates (23) (47) 0
Segment Income (Loss) 957 970 0
Offshore | Upstream | Realized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 0 0 0
Offshore | Upstream | Unrealized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 0 0 0
Canadian Manufacturing      
Revenues      
Gross Sales   6,215  
Expenses      
Purchased Product   5,156  
Operating   486  
Depreciation, Depletion and Amortization   226  
Canadian Manufacturing | Downstream      
Revenues      
Gross Sales 7,792 6,215 82
Less: Royalties 0 0 0
Revenues 7,792 6,215 82
Expenses      
Purchased Product 6,389 5,156 0
Transportation and Blending 0 0 0
Operating 704 486 37
Operating Margin 699 573 45
Depreciation, Depletion and Amortization 208 226 8
Exploration Expense 0 0 0
(Income) Loss From Equity-Accounted Affiliates 0 0 0
Segment Income (Loss) 491 347 37
Canadian Manufacturing | Downstream | Realized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 0 0 0
Canadian Manufacturing | Downstream | Unrealized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 0 0 0
U.S. Manufacturing | Downstream      
Revenues      
Gross Sales 30,310 20,043 4,733
Less: Royalties 0 0 0
Revenues 30,310 20,043 4,733
Expenses      
Purchased Product 26,112 17,955 4,429
Transportation and Blending 0 0 0
Operating 2,346 1,772 748
Operating Margin 1,740 212 (423)
Depreciation, Depletion and Amortization 640 2,381 728
Exploration Expense 0 0 0
(Income) Loss From Equity-Accounted Affiliates 0 0
Segment Income (Loss) 1,082 (2,170) (1,150)
U.S. Manufacturing | Downstream | Realized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 112 104 (21)
U.S. Manufacturing | Downstream | Unrealized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 18 1 (1)
Corporate and Eliminations      
Revenues      
Gross Sales (7,464) (5,291) (609)
Less: Royalties 0 0 0
Revenues (7,464) (5,291) (609)
Expenses      
Purchased Product (5,533) (3,844) (278)
Transportation and Blending (664) (676) (36)
Operating (1,270) (783) (306)
Depreciation, Depletion and Amortization 113 118 161
Exploration Expense 0 0 0
(Income) Loss From Equity-Accounted Affiliates 0 (5) 0
Segment Income (Loss) (52) (184) (155)
General and Administrative 865 849 292
Finance Costs 820 1,082 536
Interest Income (81) (23) (9)
Integration and Transaction Costs 106 349 29
Foreign Exchange (Gain) Loss, Net 343 (174) (181)
Revaluation (Gains) (549) 0 0
Re-measurement of Contingent Payment 162 575 (80)
Gains (losses) on disposals of non-current assets (269) (229) (81)
Other (Income) Loss, Net (532) (309) 40
Total Non-operating (Income) Expense 865 2,120 546
Corporate and Eliminations | Realized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management 31 101 5
Corporate and Eliminations | Unrealized (Gain) Loss      
Expenses      
(Gain) Loss on Risk Management $ (89) $ (18) $ 0
[1] See Note 3X for revisions to prior period results.