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ACQUISITION AND DISPOSITIONS - ASSETS HELD FOR SALE (Details) CAD in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2017 CAD | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD
ASSETS HELD FOR SALE |  |  |  |
Assets held for sale |  |  |  | CAD 278
Assets of Ozark Pipeline | Liquids Pipelines |  |  |  |
ASSETS HELD FOR SALE |  |  |  |
Assets held for sale |  |  | $ 207 | CAD 278
Assets of Ozark Pipeline | Liquids Pipelines | Forecast |  |  |  |
ASSETS HELD FOR SALE |  |  |  |
Cash proceeds | $ 219 | CAD 294 |  |
Reimbursable capital costs included in cash proceeds | $ 10 | CAD 13 |  |

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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2510-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230 + Details
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