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Summary of Significant Accounting Policies - Revisions to Prior Periods (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales | $ 71,765 | $ 48,811 | [1] | $ 13,914 | [1]
Purchased Product | 33,801 | 23,326 | [1] | 5,681 | [1]
Operating | 5,569 | 4,716 | [1] | 1,955 | [1]
Transportation and Blending | 11,530 | 8,038 | [1] | 4,728 | [1]
Depreciation, Depletion and Amortization | 4,679 | 5,886 | [1] | 3,464 | [1]
Purchased Product, Transportation and Blending |  | 31,364 |  |  |
Oil Sands |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Purchased Product |  | 2,404 |  |  |
Transportation and Blending |  | 8,625 |  |  |
Purchased Product, Transportation and Blending |  | 11,029 |  |  |
Canadian Manufacturing |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 6,215 |  |  |
Purchased Product |  | 5,156 |  |  |
Operating |  | 486 |  |  |
Depreciation, Depletion and Amortization |  | 226 |  |  |
Gross sales less purchased product |  | 347 |  |  |
Retail |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 0 |  |  |
Purchased Product |  | 0 |  |  |
Operating |  | 0 |  |  |
Depreciation, Depletion and Amortization |  | 0 |  |  |
Gross sales less purchased product |  | 0 |  |  |
Corporate and Eliminations |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales | (7,464) | (5,291) |  | (609) |
Purchased Product | (5,533) | (3,844) |  | (278) |
Operating | (1,270) | (783) |  | (306) |
Transportation and Blending | (664) | (676) |  | (36) |
Depreciation, Depletion and Amortization | $ 113 | 118 |  | $ 161 |
Gross sales less purchased product |  | (771) |  |  |
Previously Reported |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Purchased Product |  | 23,481 |  |  |
Transportation and Blending |  | 7,883 |  |  |
Purchased Product, Transportation and Blending |  | 31,364 |  |  |
Previously Reported | Oil Sands |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Purchased Product |  | 3,188 |  |  |
Transportation and Blending |  | 7,841 |  |  |
Purchased Product, Transportation and Blending |  | 11,029 |  |  |
Previously Reported | Canadian Manufacturing |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 4,472 |  |  |
Purchased Product |  | 3,552 |  |  |
Operating |  | 388 |  |  |
Depreciation, Depletion and Amortization |  | 167 |  |  |
Gross sales less purchased product |  | 365 |  |  |
Previously Reported | Retail |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 2,158 |  |  |
Purchased Product |  | 2,019 |  |  |
Operating |  | 98 |  |  |
Depreciation, Depletion and Amortization |  | 59 |  |  |
Gross sales less purchased product |  | (18) |  |  |
Previously Reported | Corporate and Eliminations |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | (5,706) |  |  |
Purchased Product |  | (4,888) |  |  |
Transportation and Blending |  | (47) |  |  |
Gross sales less purchased product |  | (771) |  |  |
Revisions |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Purchased Product |  | (155) |  |  |
Transportation and Blending |  | 155 |  |  |
Purchased Product, Transportation and Blending |  | 0 |  |  |
Revisions | Oil Sands |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Purchased Product |  | (784) |  |  |
Transportation and Blending |  | 784 |  |  |
Purchased Product, Transportation and Blending |  | 0 |  |  |
Revisions | Canadian Manufacturing |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 0 |  |  |
Purchased Product |  | 0 |  |  |
Operating |  | 0 |  |  |
Depreciation, Depletion and Amortization |  | 0 |  |  |
Gross sales less purchased product |  | 0 |  |  |
Revisions | Retail |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 0 |  |  |
Purchased Product |  | 0 |  |  |
Operating |  | 0 |  |  |
Depreciation, Depletion and Amortization |  | 0 |  |  |
Gross sales less purchased product |  | 0 |  |  |
Revisions | Corporate and Eliminations |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 0 |  |  |
Purchased Product |  | 629 |  |  |
Transportation and Blending |  | (629) |  |  |
Gross sales less purchased product |  | 0 |  |  |
Segment Aggregation |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Purchased Product |  | 0 |  |  |
Transportation and Blending |  | 0 |  |  |
Purchased Product, Transportation and Blending |  | 0 |  |  |
Segment Aggregation | Oil Sands |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Purchased Product |  | 0 |  |  |
Transportation and Blending |  | 0 |  |  |
Purchased Product, Transportation and Blending |  | 0 |  |  |
Segment Aggregation | Canadian Manufacturing |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 1,743 |  |  |
Purchased Product |  | 1,604 |  |  |
Operating |  | 98 |  |  |
Depreciation, Depletion and Amortization |  | 59 |  |  |
Gross sales less purchased product |  | (18) |  |  |
Segment Aggregation | Retail |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | (2,158) |  |  |
Purchased Product |  | (2,019) |  |  |
Operating |  | (98) |  |  |
Depreciation, Depletion and Amortization |  | (59) |  |  |
Gross sales less purchased product |  | 18 |  |  |
Segment Aggregation | Corporate and Eliminations |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 415 |  |  |
Purchased Product |  | 415 |  |  |
Transportation and Blending |  | 0 |  |  |
Gross sales less purchased product |  | $ 0 |  |  |
[1] | See Note 3X for revisions to prior period results.

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