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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Interest Rate Risk (Details) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
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 | 9
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 | $ 22 | 13
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] |  |
Short-term borrowings, percent change in interest rates | 1.00% |
Impact on net income | $ 7 | 32
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 (as a percent) | 90.80% | 85.60%

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