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OTHER LONG-TERM ASSETS - Summary of Assets, Liabilities, Partners' Equity and Equity (Income) Loss (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of joint ventures [line items] |  |  |
Current assets | $ 4,897 | $ 4,336 |
Current liabilities | 6,261 | 5,092 |
Equity | 31,653 | 26,267 | $ 27,381
Equity income | (2,397) | 204 | $ 637
North West Redwater Partnership |  |  |
Disclosure of joint ventures [line items] |  |  |
Current assets | 165 | 48 |
Non-current assets | 5,270 | 4,129 |
Current liabilities | 1,238 | 286 |
Non-current liabilities | 3,905 | 3,630 |
Equity | 292 | 261 |
Equity income | (31) | (7) |
North West Redwater Partnership |  |  |
Disclosure of joint ventures [line items] |  |  |
Current assets | 330 | 96 |
Non-current assets | 10,540 | 8,258 |
Current liabilities | 2,476 | 572 |
Non-current liabilities | 7,810 | 7,260 |
Equity | 584 | 522 |
Equity income | $ (62) | $ (14) |

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