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FINANCIAL INSTRUMENTS - Counterparty credit risk management (Details) - 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] |  |  |
Derivative financial asset (liability), net | $ 101 | $ 489 | $ 854
Credit risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial asset (liability), net | $ 187 | $ 489 |

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- Details
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