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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Interest Rate Risk (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Equity price risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Impact on net income | CAD 0 | CAD 0
Impact on other comprehensive income | 14 | 14
Currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Impact on net income | 0 | 0
Impact on other comprehensive income | 9 | 9
Interest rate risk | Short-term borrowings |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Impact on net income | 12 | 6
Impact on other comprehensive income | 0 | 0
Interest rate risk | Senior notes |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Impact on net income | 0 | 2
Impact on other comprehensive income | 0 | 0
Interest rate risk | Bank credit facilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Impact on net income | 0 | 2
Impact on other comprehensive income | CAD 0 | CAD 0
Fixed interest rate | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Percent of borrowings | 89.50% | 91.20%
Cost prior to impairment losses | Floating interest rate | Senior Notes Due 2017 |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount | CAD 250 |

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