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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - OTHER FINANCIAL INSTRUMENTS (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Fair Value of Other Financial Instruments |  |
Realized gain (loss) associated with the settlement of United Stated dollar denominated debt that matured | $ 0 | $ 0
Equity investments at carrying value | 52 | 52
Restricted long-term investments | 630 | 553
Long-term debt | 82,000 | 75,100
Long-term loans receivable from affiliates | 1,000 | 1,100
Net Investment Hedges |  |
Fair Value of Other Financial Instruments |  |
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt | 49 | 117
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts | 0 | 13
Realized loss associated with the settlement of foreign exchange forward contracts | 0 | 15
Carrying value |  |
Fair Value of Other Financial Instruments |  |
Long-term debt | $ 74,400 | $ 66,100

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