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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Fair Value of Other Financial Instruments
FMVA investments	$ 178		$ 178		$ 173
Restricted long-term investments and cash	959		959		717
Long-term debt, carrying value	94,800		94,800		81,200
Long-term debt	94,500		94,500		78,100
Debt Securities
Fair Value of Other Financial Instruments
Debt securities, available-for-sale, amortized cost	248		248		279
Equity Funds And Debt Securities
Fair Value of Other Financial Instruments
Unrealized gain on investment	14	$ (8)	35	$ 14
Level 1
Fair Value of Other Financial Instruments
Restricted long-term investments and cash	447		447		263
Level 1 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	334		334		287
Level 2
Fair Value of Other Financial Instruments
Restricted long-term investments and cash	512		512		454
Restricted long-term investments, cost basis	529		529		486
Level 2 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	255		255		284
Fair Value
Fair Value of Other Financial Instruments
Restricted long-term investments and cash	959		959		$ 717
Unrealized holding gains (losses)	$ 46	$ (44)	45	(7)
Net investment hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange (loss) gain on translation of United States dollar denominated debt			(244)	86
Realized losses associated with settlement of debt			$ 113	$ 44