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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Financial Instruments at Fair Value (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly-traded companies | CAD 1,465 | CAD 1,047 |
Derivative financial assets | 1,094 | 1,659 | CAD 2,080
Total financial assets | 2,839 | 2,846 |
Total financial liabilities | 280 | 140 |
Long-term debt | 14,448 | 16,080 | 16,870
Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,129 | 1,683 |
Derivative financial liabilities | 23 | 0 |
Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 68 | 8 | (15)
Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,152 | 1,683 | 2,028
Derivative financial liabilities | 149 | 68 |
Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets |  | 19 | CAD 158
Derivative financial liabilities | 44 | 21 |
Cash flow hedges | Bond forward |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | 64 | 51 |
At fair value [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 16,134 | 17,628 |
Level 1 of fair value hierarchy [member] | At fair value [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly-traded companies | 1,465 | 1,047 |
Total financial assets | 1,465 | 1,047 |
Total financial liabilities | 0 | 0 |
Level 1 of fair value hierarchy [member] | At fair value [member] | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | 0 | 0 |
Level 1 of fair value hierarchy [member] | At fair value [member] | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Level 1 of fair value hierarchy [member] | At fair value [member] | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities | 0 | 0 |
Level 1 of fair value hierarchy [member] | At fair value [member] | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities | 0 | 0 |
Level 1 of fair value hierarchy [member] | At fair value [member] | Cash flow hedges | Bond forward |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | 0 | 0 |
Level 2 of fair value hierarchy [member] | At fair value [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly-traded companies | 0 | 0 |
Total financial assets | 1,374 | 1,799 |
Total financial liabilities | 280 | 140 |
Level 2 of fair value hierarchy [member] | At fair value [member] | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | 23 | 0 |
Level 2 of fair value hierarchy [member] | At fair value [member] | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 68 | 8 |
Level 2 of fair value hierarchy [member] | At fair value [member] | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,301 | 1,751 |
Derivative financial liabilities | 149 | 68 |
Level 2 of fair value hierarchy [member] | At fair value [member] | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 5 | 40 |
Derivative financial liabilities | 44 | 21 |
Level 2 of fair value hierarchy [member] | At fair value [member] | Cash flow hedges | Bond forward |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | CAD 64 | CAD 51 |

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