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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, 2024
Dec. 31, 2023
Revenue [abstract]    
Gross Sales $ 57,726 $ 55,474
Royalties (3,449) (3,270)
Revenues [1] 54,277 52,204
Expenses    
Purchased Product 26,103 24,715
Transportation and Blending 10,538 10,141
Purchased product, transportation and blending [1] 36,641 34,856
Operating 6,841 6,352
(Gain) Loss on Risk Management 58 61
Depreciation, Depletion and Amortization 4,871 4,644
Exploration Expense 69 42
(Income) Loss From Equity-Accounted Affiliates (66) (51)
Segment Income (Loss) 5,863 6,300
General and Administrative 794 688
Finance Costs, Net [1] 514 538
Integration, Transaction and Other Costs 166 85
Foreign Exchange (Gain) Loss, Net 462 (67)
(Gain) Loss on Divestiture of Assets (119) 20
Re-measurement of Contingent Payments 30 59
Other (Income) Loss, Net (55) (63)
Total Non-operating (Income) Expense 1,792 1,260
Earnings (Loss) Before Income Tax 4,071 5,040
Income Tax Expense (Recovery) 929 931
Net Earnings (Loss) 3,142 4,109
Realized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 46 9
Unrealized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 12 52
Upstream    
Revenue [abstract]    
Gross Sales 33,078 31,082
Royalties (3,449) (3,270)
Revenues 29,629 27,812
Expenses    
Purchased Product 3,674 3,152
Transportation and Blending 11,331 11,088
Operating 3,489 3,690
Operating Margin 11,121 9,870
Depreciation, Depletion and Amortization 4,122 3,866
Exploration Expense 69 42
(Income) Loss From Equity-Accounted Affiliates (65) (51)
Segment Income (Loss) 7,007 6,017
Upstream | Realized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 14 12
Upstream | Unrealized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management (12) (4)
Downstream    
Revenue [abstract]    
Gross Sales 33,618 32,626
Royalties 0 0
Revenues 33,618 32,626
Expenses    
Purchased Product 30,252 28,273
Transportation and Blending 0 0
Operating 3,670 3,201
Operating Margin (312) 1,152
Depreciation, Depletion and Amortization 647 671
Exploration Expense 0 0
(Income) Loss From Equity-Accounted Affiliates 0 0
Segment Income (Loss) (967) 498
Downstream | Realized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 8 0
Downstream | Unrealized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 8 (17)
External Sales    
Revenue [abstract]    
Gross Sales 57,726 55,474
External Sales | Upstream    
Revenue [abstract]    
Gross Sales 24,640 23,713
External Sales | Downstream    
Revenue [abstract]    
Gross Sales 33,086 31,761
Intersegment Sales    
Revenue [abstract]    
Gross Sales 0 0
Intersegment Sales | Upstream    
Revenue [abstract]    
Gross Sales 8,438 7,369
Intersegment Sales | Downstream    
Revenue [abstract]    
Gross Sales 532 865
Oil Sands | Upstream    
Revenue [abstract]    
Gross Sales 28,447 26,192
Royalties (3,274) (3,059)
Revenues 25,173 23,133
Expenses    
Purchased Product 1,851 1,457
Transportation and Blending 11,000 10,774
Operating 2,511 2,716
Operating Margin 9,791 8,169
Depreciation, Depletion and Amortization 3,117 2,993
Exploration Expense 2 19
(Income) Loss From Equity-Accounted Affiliates (14) 6
Segment Income (Loss) 6,702 5,136
Oil Sands | Upstream | Realized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 20 17
Oil Sands | Upstream | Unrealized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management (16) 15
Oil Sands | External Sales | Upstream    
Revenue [abstract]    
Gross Sales 21,857 20,608
Oil Sands | Intersegment Sales | Upstream    
Revenue [abstract]    
Gross Sales 6,590 5,584
Conventional | Upstream    
Revenue [abstract]    
Gross Sales 3,059 3,273
Royalties (76) (112)
Revenues 2,983 3,161
Expenses    
Purchased Product 1,823 1,695
Transportation and Blending 320 298
Operating 555 590
Operating Margin 291 583
Depreciation, Depletion and Amortization 442 386
Exploration Expense 1 6
(Income) Loss From Equity-Accounted Affiliates 2 0
Segment Income (Loss) (158) 210
Conventional | Upstream | Realized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management (6) (5)
Conventional | Upstream | Unrealized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 4 (19)
Conventional | External Sales | Upstream    
Revenue [abstract]    
Gross Sales 1,211 1,488
Conventional | Intersegment Sales | Upstream    
Revenue [abstract]    
Gross Sales 1,848 1,785
Offshore | Upstream    
Revenue [abstract]    
Gross Sales 1,572 1,617
Royalties (99) (99)
Revenues 1,473 1,518
Expenses    
Purchased Product 0 0
Transportation and Blending 11 16
Operating 423 384
Operating Margin 1,039 1,118
Depreciation, Depletion and Amortization 563 487
Exploration Expense 66 17
(Income) Loss From Equity-Accounted Affiliates (53) (57)
Segment Income (Loss) 463 671
Offshore | Upstream | Realized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 0 0
Offshore | Upstream | Unrealized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 0 0
Offshore | External Sales | Upstream    
Revenue [abstract]    
Gross Sales 1,572 1,617
Offshore | Intersegment Sales | Upstream    
Revenue [abstract]    
Gross Sales 0 0
Canadian Refining | Downstream    
Revenue [abstract]    
Gross Sales 5,310 6,233
Royalties 0 0
Revenues 5,310 6,233
Expenses    
Purchased Product 4,483 4,919
Transportation and Blending 0 0
Operating 907 639
Operating Margin (80) 675
Depreciation, Depletion and Amortization 185 185
Exploration Expense 0 0
(Income) Loss From Equity-Accounted Affiliates 0 0
Segment Income (Loss) (265) 490
Canadian Refining | Downstream | Realized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 0 0
Canadian Refining | Downstream | Unrealized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 0 0
Canadian Refining | External Sales | Downstream    
Revenue [abstract]    
Gross Sales 4,787 5,385
Canadian Refining | Intersegment Sales | Downstream    
Revenue [abstract]    
Gross Sales 523 848
U.S. Refining | Downstream    
Revenue [abstract]    
Gross Sales 28,308 26,393
Royalties 0 0
Revenues 28,308 26,393
Expenses    
Purchased Product 25,769 23,354
Transportation and Blending 0 0
Operating 2,763 2,562
Operating Margin (232) 477
Depreciation, Depletion and Amortization 462 486
Exploration Expense 0 0
(Income) Loss From Equity-Accounted Affiliates 0 0
Segment Income (Loss) (702) 8
U.S. Refining | Downstream | Realized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 8 0
U.S. Refining | Downstream | Unrealized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 8 (17)
U.S. Refining | External Sales | Downstream    
Revenue [abstract]    
Gross Sales 28,299 26,376
U.S. Refining | Intersegment Sales | Downstream    
Revenue [abstract]    
Gross Sales 9 17
Corporate and Eliminations    
Revenue [abstract]    
Gross Sales (8,970) (8,234)
Royalties 0 0
Revenues (8,970) (8,234)
Expenses    
Purchased Product (7,823) (6,710)
Transportation and Blending (793) (947)
Purchased product, transportation and blending (8,616) (7,657)
Operating (318) (539)
Depreciation, Depletion and Amortization 102 107
Exploration Expense 0 0
(Income) Loss From Equity-Accounted Affiliates (1) 0
Segment Income (Loss) (177) (215)
General and Administrative 794 688
Finance Costs, Net 514 538
Integration, Transaction and Other Costs 166 85
Foreign Exchange (Gain) Loss, Net 462 (67)
(Gain) Loss on Divestiture of Assets (119) 20
Re-measurement of Contingent Payments 30 59
Other (Income) Loss, Net (55) (63)
Total Non-operating (Income) Expense 1,792 1,260
Corporate and Eliminations | Realized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 24 (3)
Corporate and Eliminations | Unrealized (Gain) Loss    
Expenses    
(Gain) Loss on Risk Management 16 73
Corporate and Eliminations | External Sales    
Revenue [abstract]    
Gross Sales 0 0
Corporate and Eliminations | Intersegment Sales    
Revenue [abstract]    
Gross Sales $ (8,970) $ (8,234)
[1]
(1)Revised presentation as of January 1, 2024. See Note 4.