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Decommissioning Liabilities (Tables) | 12 Months Ended
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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 | )

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