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Decommissioning Liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Provision For Decommissioning Restoration And Rehabilitation Costs [Abstract]  
Summary of Decommissioning Provision The aggregate carrying amount of the obligation is:

 

2020

 

 

2019

 

Decommissioning Liabilities, Beginning of Year

 

1,235

 

 

 

875

 

Liabilities Incurred

 

14

 

 

 

3

 

Liabilities Settled

 

(42

)

 

 

(52

)

Liabilities Disposed

 

(2

)

 

 

(8

)

Change in Estimated Future Cash Flows

 

13

 

 

 

21

 

Change in Discount Rate

 

(28

)

 

 

339

 

Unwinding of Discount on Decommissioning Liabilities (Note 6)

 

57

 

 

 

58

 

Foreign Currency Translation

 

1

 

 

 

(1

)

Decommissioning Liabilities, End of Year

 

1,248

 

 

 

1,235

 

 
Summary of Changes to the Credit-Adjusted Risk-Free Rate or the Inflation Rate Impact on the Decommissioning Liabilities

Changes to the credit-adjusted risk-free rate or the inflation rate would have the following impact on the decommissioning liabilities:

 

 

 

2020

 

 

2019

 

As at December 31,

Sensitivity Range

 

Increase

 

 

Decrease

 

 

Increase

 

 

Decrease

 

Credit-Adjusted Risk-Free Rate

± one percent

 

 

(228

)

 

 

313

 

 

 

(236

)

 

 

332

 

Inflation Rate

± one percent

 

 

321

 

 

 

(235

)

 

 

340

 

 

 

(243

)