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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Fair Value of Other Financial Instruments
FMVA investments	$ 180		$ 180		$ 173
Restricted long-term investments	756		756		717
Long-term debt, carrying value	92,300		92,300		81,200
Long-term debt	88,700		88,700		78,100
Debt Securities
Fair Value of Other Financial Instruments
Debt securities, available-for-sale, amortized cost	274		274		279
Equity Funds And Debt Securities
Fair Value of Other Financial Instruments
Unrealized gain on investment	5	$ 7	21	$ 22
Level 1
Fair Value of Other Financial Instruments
Restricted long-term investments	302		302		263
Level 1 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	321		321		287
Level 2
Fair Value of Other Financial Instruments
Restricted long-term investments	454		454		454
Restricted long-term investments, cost basis	501		501		486
Level 2 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	281		281		284
Fair Value
Fair Value of Other Financial Instruments
Restricted long-term investments	756		756		$ 717
Unrealized holding gains (losses)	$ 12	$ 3	(1)	37
Net investment hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt			(425)	444
Realized losses associated with settlement of debt			$ 113	$ 44