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Exploration and Evaluation Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Exploration And Evaluation Assets [Abstract] |
Summary of Exploration and Valuation Assets, Net |
| Total |
As at December 31, 2019 |  | 787 |
Additions |  | 48 |
Transfers to PP&E (Note 18) |  | (47) |
Exploration Expense |  | (91) |
Depletion |  | (18) |
Change in Decommissioning Liabilities |  | 5 |
Divestitures (Note 9) |  | (61) |
As at December 31, 2020 |  | 623 |
Acquisition (Note 5A) |  | 45 |
Additions |  | 55 |
Exploration Expense |  | (9) |
Change in Decommissioning Liabilities |  | 6 |
As at December 31, 2021 |  | 720 |

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