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Summary of Significant Accounting Policies - Revisions to Prior Periods (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales | $ 48,811 | $ 13,914 | [1] | $ 21,715 | [1]
Purchased Product | $ 23,481 | 5,681 | [1] | 8,789 | [1]
Oil Sands |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 8,804 |  | 13,101 |
Purchased Product |  | 1,262 |  | 2,231 |
Gross sales less purchased product |  | 7,542 |  | 10,870 |
Previously Reported | Oil Sands |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 8,481 |  | 12,739 |
Purchased Product |  | 939 |  | 1,869 |
Gross sales less purchased product |  | 7,542 |  | 10,870 |
Revision | Oil Sands |  |  |  |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross Sales |  | 323 |  | 362 |
Purchased Product |  | 323 |  | 362 |
Gross sales less purchased product |  | $ 0 |  | $ 0 |
[1] | See Note 3(w) for revisions to comparative results.

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