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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Disclosure Of Summary Of Significant Accounting Policies [Abstract] |
Disclosure of Revisions to Prior Period | Year Ended December 31, 2021
Oil Sands Segment | Previously Reported |  | Revisions |  | Segment Aggregation |  | Revised |  |  |  |  |  |
Purchased Product | 3,188 |  | (784) |  | — |  | 2,404 |  |  |  |  |  |
Transportation and Blending | 7,841 |  | 784 |  | — |  | 8,625 |  |  |  |  |  |
| 11,029 |  | — |  | — |  | 11,029 |  |  |  |  |  |
Canadian Manufacturing | Previously Reported |  | Revisions |  | Segment Aggregation |  | Revised |  |  |  |  |  |
Gross Sales | 4,472 |  | — |  | 1,743 |  | 6,215 |  |  |  |  |  |
Purchased Product | 3,552 |  | — |  | 1,604 |  | 5,156 |  |  |  |  |  |
Operating | 388 |  | — |  | 98 |  | 486 |  |  |  |  |  |
Depreciation, Depletion and Amortization | 167 |  | — |  | 59 |  | 226 |  |  |  |  |  |
| 365 |  | — |  | (18) |  | 347 |  |  |  |  |  |
Retail | Previously Reported |  | Revisions |  | Segment Aggregation |  | Revised |  |  |  |  |  |
Gross Sales | 2,158 |  | — |  | (2,158) |  | — |  |  |  |  |  |
Purchased Product | 2,019 |  | — |  | (2,019) |  | — |  |  |  |  |  |
Operating | 98 |  | — |  | (98) |  | — |  |  |  |  |  |
Depreciation, Depletion and Amortization | 59 |  | — |  | (59) |  | — |  |  |  |  |  |
| (18) |  | — |  | 18 |  | — |  |  |  |  |  |
Corporate and Eliminations Segment | Previously Reported |  | Revisions |  | Segment Aggregation |  | Revised |  |  |  |  |  |
Gross Sales | (5,706) |  | — |  | 415 |  | (5,291) |  |  |  |  |  |
Purchased Product | (4,888) |  | 629 |  | 415 |  | (3,844) |  |  |  |  |  |
Transportation and Blending | (47) |  | (629) |  | — |  | (676) |  |  |  |  |  |
| (771) |  | — |  | — |  | (771) |  |  |  |  |  |
Consolidated | Previously Reported |  | Revision |  | Segment Aggregation |  | Revised |  |  |  |  |  |
Purchased Product | 23,481 |  | (155) |  | — |  | 23,326 |  |  |  |  |  |
Transportation and Blending | 7,883 |  | 155 |  | — |  | 8,038 |  |  |  |  |  |
| 31,364 |  | — |  | — |  | 31,364 |  |  |  |  |  |

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