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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Net Cash Payments on Debt Derivatives (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items] |  |
Total payments on debt derivatives and forward contracts | CAD (13,321) | CAD (12,237)
Net payments on settlement of debt derivatives and forward contracts | (79) | (45)
Debt derivatives and forward contracts |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 12,002 | 11,167
Total payments on debt derivatives and forward contracts | (12,081) | (11,212)
Net payments on settlement of debt derivatives and forward contracts | (79) | (45)
Debt derivatives | US commercial paper |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 9,692 | 0
Total payments on debt derivatives and forward contracts | (9,754) | 0
Debt derivatives | Bank credit facilities |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 2,310 | 11,167
Total payments on debt derivatives and forward contracts | (2,327) | (11,159)
Bond forward |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total payments on debt derivatives and forward contracts | CAD 0 | CAD (53)

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