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Exploration and Evaluation Assets, Net (Tables) | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Exploration And Evaluation Assets [Abstract] |
Summary of Exploration and Valuation Assets, Net |
| Total |
As at December 31, 2020 |  | 623 |
Additions |  | 37 |
Exploration Expense |  | (12) |
Change in Decommissioning Liabilities |  | 8 |
Exchange Rate Movements and Other |  | (1) |
As at September 30, 2021 |  | 655 |

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