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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Interest Rate Risk (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Equity price risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Share price of publicly traded investments, change | $ 1 |
Impact on net income | 0 | $ 0
Impact on other comprehensive income | $ 14,000,000 | 14,000,000
Currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Expenditure derivatives - change in foreign exchange rate, change in Cdn% relative to US$ (in dollars per share) | $ 0.01 |
Impact on net income | $ 0 | 0
Impact on other comprehensive income | $ 12,000,000 | 7,000,000
Interest rate risk | Short-term borrowings |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Short-term borrowings, percent change in interest rates | 1.00% |
Impact on net income | $ 9,000,000 | 17,000,000
Impact on other comprehensive income | $ 0 | $ 0
Fixed interest rate | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Percent of borrowings | 93.60% | 87.20%
Floating interest rate | Interest rate risk | Senior Notes Due 2022 |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Short-term borrowings, percent change in interest rates | 1.00% |
Impact on net income | $ 7,000,000 | $ 0
Impact on other comprehensive income | $ 0 | $ 0

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