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ASSET RETIREMENT OBLIGATIONS (Details) - CAD CAD in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of movements in the Company's ARO |  |  |  |  |
Obligations at beginning of year | CAD 198 | CAD 185 |  |  |
Liabilities incurred | 2 | 2 | CAD 177 |  |
Liabilities settled | (33) | (45) |  |  |
Change in estimate | 63 | 30 |  |  |
Foreign currency translation adjustment | (5) | 21 |  |  |
Accretion expense | 7 | 5 |  |  |
Obligations at end of year | 232 | 198 | 185 |  |
Presented as follows: |  |  |  |  |
Asset retirement obligations, current |  |  |  | CAD 2 | CAD 9
Asset retirement obligations, non-current |  |  |  | 230 | 189
Total obligations | CAD 198 | CAD 185 | 185 | 232 | 198
Minimum |  |  |  |  |
Discount rate | 1.70% | 1.70% |  |  |
Maximum |  |  |  |  |
Discount rate | 11.00% | 9.40% |  |  |
Accounts payable and other |  |  |  |  |
Presented as follows: |  |  |  |  |
Asset retirement obligations, current |  |  |  | 2 | 9
Other long-term liabilities |  |  |  |  |
Presented as follows: |  |  |  |  |
Asset retirement obligations, non-current |  |  |  | CAD 230 | CAD 189
Decommissioning of certain portions of Line 6B Lakehead System |  |  |  |  |
Reconciliation of movements in the Company's ARO |  |  |  |  |
Liabilities incurred |  |  | 74 |  |
Line 3 Replacement Program |  |  |  |  |
Reconciliation of movements in the Company's ARO |  |  |  |  |
Liabilities incurred |  |  | CAD 103 |  |

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 35 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846 + Details
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