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Summary of Accounting Policies - Revisions to Prior Periods (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Gross Sales |  | $ 55,474 | $ 71,765
Purchased Product | [1] | 24,715 | 33,958
Operating | [1] | 6,352 | 5,816
Transportation and Blending | [1] | 10,141 | 11,126
Depreciation, Depletion and Amortization |  | 4,644 | 4,679
Oil Sands |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Gross Sales |  |  | 34,683
Purchased Product |  |  | 4,718
Gross sales less purchased product |  |  | 29,965
Corporate and Eliminations |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Gross Sales |  | (8,234) | (7,387)
Purchased Product |  | (6,710) | (5,192)
Operating |  | (539) | (1,023)
Transportation and Blending |  | (947) | (1,175)
Depreciation, Depletion and Amortization |  | $ 107 | 113
Previously Reported |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Purchased Product |  |  | 33,801
Operating |  |  | 5,569
Transportation and Blending |  |  | 11,530
Previously Reported | Oil Sands |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Gross Sales |  |  | 34,775
Purchased Product |  |  | 4,810
Gross sales less purchased product |  |  | 29,965
Previously Reported | Corporate and Eliminations |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Gross Sales |  |  | (7,464)
Purchased Product |  |  | (5,533)
Operating |  |  | (1,270)
Transportation and Blending |  |  | (664)
Revisions |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Purchased Product |  |  | 157
Operating |  |  | 247
Transportation and Blending |  |  | (404)
Revisions | Oil Sands |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Gross Sales |  |  | (92)
Purchased Product |  |  | (92)
Gross sales less purchased product |  |  | 0
Revisions | Corporate and Eliminations |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Gross Sales |  |  | 77
Purchased Product |  |  | 341
Operating |  |  | 247
Transportation and Blending |  |  | $ (511)
[1] | Comparative periods reflect certain revisions. See Note 39.

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