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Decommissioning Liabilities (Tables)
9 Months Ended
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, 20201,248
Acquisitions (Note 4)2,719
Liabilities Incurred12
Liabilities Acquired5
Liabilities Settled(97)
Liabilities Disposed(128)
Change in Estimated Future Cash Flows8
Unwinding of Discount on Decommissioning Liabilities (Note 6)143
Foreign Currency Translation4
As at September 30, 20213,914