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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair Value of Other Financial Instruments |  |
Equity investments at carrying value | $ 187 | $ 173
Long-term debt | 98,900 | 78,100
Equity Funds And Debt Securities |  |
Fair Value of Other Financial Instruments |  |
Unrealized gain (loss) on investments | (16) | 34
Level 1 | Equity funds |  |
Fair Value of Other Financial Instruments |  |
Fair value of investments | 114 | 287
Level 2 |  |
Fair Value of Other Financial Instruments |  |
Investment owned restricted cost | 1,100 | 279
Level 2 | Debt Securities |  |
Fair Value of Other Financial Instruments |  |
Fair value of investments | 1,100 | 284
Carrying value |  |
Fair Value of Other Financial Instruments |  |
Long-term debt | 101,600 | 81,200
Foreign exchange contracts |  |
Fair Value of Other Financial Instruments |  |
Amount of unrealized gain/(loss) recognized in OCI | 0 | 0
Realized gain on AOCI | 0 | 0
Net investment hedges |  |
Fair Value of Other Financial Instruments |  |
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt | (1,185) | 645
Realized loss associated with the settlement of foreign exchange forward contracts | $ 120 | $ 236

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