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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2021
Classes of current inventories [abstract] |
Disclosure Of Detailed Information About Inventories Explanatory |
As at December 31, |  | 2021 |  |  |  | 2020 (1) |  |  |  |  |
Product |  |  |  |  |  |  |  |  |  |  |
Oil Sands |  | 1,419 |  |  |  | 382 |  |  |  |  |
Conventional |  | 78 |  |  |  | 1 |  |  |  |  |
Offshore |  | 39 |  |  |  | — |  |  |  |  |
Canadian Manufacturing |  | 88 |  |  |  | — |  |  |  |  |
U.S. Manufacturing |  | 2,001 |  |  |  | 613 |  |  |  |  |
Retail |  | 26 |  |  |  | — |  |  |  |  |
Parts and Supplies |  | 268 |  |  |  | 93 |  |  |  |  |
|  | 3,919 |  |  |  | 1,089 |  |  |  |  |

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