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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Fair Value of Other Financial Instruments |  |  |  |  |
Transfer into or out of level 3 |  |  | $ 0 |  | $ 0
FMVA investments | $ 185,000,000 |  | 185,000,000 |  | 187,000,000
Long-term debt | 98,700,000,000 |  | 98,700,000,000 |  | 98,900,000,000
Equity Funds And Debt Securities |  |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |  |
Unrealized gain on investment | 1,000,000 | $ 5,000,000 | 1,000,000 | $ 21,000,000 |
Level 1 | Equity Funds |  |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |  |
Fair value of investments | 0 |  | 0 |  | 114,000,000
Level 2 |  |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |  |
Restricted long-term investments, cost basis | 1,100,000,000 |  | 1,100,000,000 |  | 1,100,000,000
Level 2 | Debt Securities |  |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |  |
Fair value of investments | 1,100,000,000 |  | 1,100,000,000 |  | 1,100,000,000
Carrying Value |  |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |  |
Long-term debt | $ 100,600,000,000 |  | 100,600,000,000 |  | $ 101,600,000,000
Net investment hedges |  |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |  |
Unrealized foreign exchange (loss) gain on translation of United States dollar denominated debt |  |  | 494,000,000 | (425,000,000) |
Realized loss associated with the settlement of foreign exchange forward contracts |  |  | $ 81,000,000 | $ 113,000,000 |

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