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ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliation of movements in the Company's ARO | A reconciliation of movements in our ARO liabilities is as follows:
December 31, | 2020 | 2019
(millions of Canadian dollars) |  |
Obligations at beginning of year | 520 |  | 989 |
Liabilities disposed | — |  | (59) |
Liabilities incurred | — |  | 15 |
Liabilities settled | (30) |  | (12) |
Change in estimate and other | — |  | (417) |
Foreign currency translation adjustment | (6) |  | (18) |
Accretion expense | 12 |  | 22 |
Obligations at end of year | 496 |  | 520 |
Presented as follows: |  |
Accounts payable and other | 56 |  | 7 |
Other long-term liabilities | 440 |  | 513 |
| 496 |  | 520 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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