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PROPERTY, PLANT AND EQUIPMENT - IMPAIRMENT (Details) - CAD CAD in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 29, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
IMPAIRMENT |  |  |  |
Impairment loss |  | CAD 1,376 | CAD 96 |
Northern Gateway Pipeline Project |  |  |  |
IMPAIRMENT |  |  |  |
Impairment loss | CAD 373 |  |  |
Impairment loss, net of tax | CAD 272 |  |  |
Sandpiper Project |  |  |  |
IMPAIRMENT |  |  |  |
Impairment loss |  | 992 |  |
Impairment loss, net of tax |  | 81 |  |
Estimated remaining fair value |  |  |  | CAD 71
Enbridge Energy Partners, L.P. |  |  |  |
IMPAIRMENT |  |  |  |
Impairment charges |  |  | 96 |
Land | Sandpiper Project |  |  |  |
IMPAIRMENT |  |  |  |
Estimated remaining fair value |  | 3 |  |
Non-core trucking assets and related facilities | Enbridge Energy Partners, L.P. |  |  |  |
IMPAIRMENT |  |  |  |
Impairment charges |  | CAD 11 |  |
Berthold rail facility | Enbridge Energy Partners, L.P. |  |  |  |
IMPAIRMENT |  |  |  |
Impairment charges |  |  | 80 |
Louisiana propylene pipeline | Enbridge Energy Partners, L.P. |  |  |  |
IMPAIRMENT |  |  |  |
Impairment charges |  |  | CAD 16 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68048823&loc=d3e92212-112881 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 + Details
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