Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Restricted Long-Term Investments (Details) - CAD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Long-Lived Assets Held-for-sale [Line Items]
Purchase of restricted long-term investments			$ 1,100	$ 319
Sale of restricted long-term investments			995	240
Level 1
Long-Lived Assets Held-for-sale [Line Items]
Restricted long-term investments and cash	$ 838		838		$ 491
Level 2
Long-Lived Assets Held-for-sale [Line Items]
Restricted long-term investments and cash	407		407		507
Debt securities, available-for-sale, amortized cost	408		408		$ 540
Fair Value \| Restricted Long-Term Investments and Cash Held in Trust
Long-Lived Assets Held-for-sale [Line Items]
Unrealized holding gains (losses)	$ 50	$ 46	$ 96	$ 45