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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.

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