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Decommissioning Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2021
Provision for decommissioning, restoration and rehabilitation costs [abstract] |
Summary of Decommissioning Provision | The aggregate carrying amount of the obligation is:
| Total |
As at December 31, 2020 |  | 1,248 |
Acquisitions (Note 4) |  | 2,719 |
Liabilities Incurred |  | 12 |
Liabilities Acquired |  | 5 |
Liabilities Settled |  | (97) |
Liabilities Disposed |  | (128) |
Change in Estimated Future Cash Flows |  | 8 |
Unwinding of Discount on Decommissioning Liabilities (Note 6) |  | 143 |
Foreign Currency Translation |  | 4 |
As at September 30, 2021 |  | 3,914 |

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