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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Interest Rate Risk (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
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 | $ 17,000,000 | 17,000,000
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 | 7,000,000 | 8,000,000
Interest rate risk | Interest rate derivatives |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Impact on net income | 0 | 0
Impact on other comprehensive income | 0 | 76,000,000
Interest rate risk | Debt derivatives |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Impact on net income | 0 | 0
Impact on other comprehensive income | $ 0 | 46,000,000
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 | $ 22,000,000 | 16,000,000
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 (as a percent) | 91.20% | 89.30%
Fixed 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 | 0.10% |
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 | $ 0 | $ 7,000,000
Impact on other comprehensive income | $ 0 | $ 0

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