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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Balance Sheet Classification (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] |  |  |
Current portion of derivative instruments | CAD 421 | CAD 91 |
Derivative instruments | 953 | 1,708 |
Derivative financial assets | 1,094 | 1,659 | CAD 2,080
Current portion of derivative instruments | (133) | (22) |
Derivative instruments | (147) | (118) |
Before Offset Amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current portion of derivative instruments | 421 | 91 |
Derivative instruments | 953 | 1,708 |
Derivative financial assets | 1,374 | 1,799 |
Current portion of derivative instruments | (133) | (22) |
Derivative instruments | (147) | (118) |
Derivative financial liabilities | CAD (280) | CAD (140) |

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