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Decommissioning Liabilities | 12 Months Ended
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Dec. 31, 2020
Provision For Decommissioning Restoration And Rehabilitation Costs [Abstract] |
Decommissioning Liabilities | 27. DECOMMISSIONING LIABILITIES The decommissioning provision represents the present value of the expected future costs associated with the retirement of upstream crude oil and natural gas assets, refining facilities and the crude-by-rail terminal. 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 |
As at December 31, 2020, the undiscounted amount of estimated future cash flows required to settle the obligation is $4,953 million (2019 – $5,173 million), which has been discounted using a credit-adjusted risk-free rate of 5.0 percent (2019 – 4.9 percent) and an inflation rate of two percent (2019 – two percent). Most of these obligations are not expected to be paid for several years, or decades, and are expected to be funded from general resources at that time. The Company expects to settle approximately $40 million to $45 million of decommissioning liabilities over the next year. Revisions in estimated future cash flows resulted from a change in the timing of decommissioning liabilities over the estimated life of the reserves and an increase in cost estimates. Sensitivities 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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- Definition The entire disclosure for other provisions, contingent liabilities and contingent assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&doctype=Standard&dita_xref=IAS37_g84-92_TI -URIDate 2020-01-01 + Details
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