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Exploration and Evaluation Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Exploration And Evaluation Assets [Abstract] |
Summary of Exploration and Valuation Assets |
| Total |
As at December 31, 2018 |  | 785 |
Additions |  | 73 |
Exploration Expense (Note 10) |  | (82 | )
Change in Decommissioning Liabilities |  | 9 |
Exchange Rate Movements and Other |  | 2 |
As at December 31, 2019 |  | 787 |
Additions |  | 48 |
Transfers to PP&E (Note 18) (1) |  | (47 | )
Exploration Expense (Note 10) |  | (91 | )
Depletion |  | (18 | )
Change in Decommissioning Liabilities |  | 5 |
Divestitures (Note 8) |  | (61 | )
As at December 31, 2020 |  | 623 |
(1)Includes the $41 million reclassification of the GORR retained in the sale of the Marten Hills assets (see Note 8).

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