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ASSET RETIREMENT OBLIGATIONS (Details) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of movements in the Company's ARO |  |  |  |
Obligations at beginning of year | $ 520 | $ 989 |  |
Liabilities disposed | 0 | (59) |  |
Liabilities incurred | 0 | 15 |  |
Liabilities settled | (30) | (12) |  |
Change in estimate and other | 0 | (417) |  |
Foreign currency translation adjustment | (6) | (18) |  |
Accretion expense | 12 | 22 |  |
Obligations at end of year | 496 | 520 |  |
Accounts payable and other |  |  | $ 56 | $ 7
Other long-term liabilities |  |  | 440 | 513
Asset retirement obligations | $ 496 | $ 520 | $ 496 | $ 520
Minimum |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |
Discount rate (as a percent) | 1.80% |  |  |
Maximum |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |
Discount rate (as a percent) | 9.00% |  |  |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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