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OTHER LONG-TERM ASSETS - Schedule of other long-term assets (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Subclassifications of assets, liabilities and equities [abstract] |  |
Investment in North West Redwater Partnership | $ 292 | $ 261
North West Redwater Partnership subordinated debt | 510 | 385
Risk Management (note 18) | 204 | 489
Other | 241 | 168
Other assets | 1,247 | 1,303
Current portion of other long-term assets | 79 | 283
Other long-term assets | $ 1,168 | $ 1,020

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