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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Fair Value of Other Financial Instruments
Unrealized gains (losses) on the change in fair value of foreign exchange foreign contracts			$ 0	$ 0
Realized gain (loss) recognized in OCI associated with settlement of foreign exchange forward contracts			0	0
FMVA investments	$ 207,000,000		207,000,000		$ 102,000,000
Restricted long-term investments	664,000,000		664,000,000		593,000,000
Long-term debt, carrying value	78,700,000,000		78,700,000,000		79,300,000,000
Long-term debt	73,800,000,000		73,800,000,000		73,500,000,000
Debt Securities
Fair Value of Other Financial Instruments
Debt securities, available-for-sale, amortized cost	314,000,000		314,000,000		295,000,000
Equity Funds And Debt Securities
Fair Value of Other Financial Instruments
Unrealized gain (loss) on lnvestments	7,000,000	$ (19,000,000)	22,000,000	(27,000,000)
Net investment hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt			444,000,000	(257,000,000)
Realized loss associated with the settlement of foreign exchange forward contracts			44,000,000	0
Level 1
Fair Value of Other Financial Instruments
Restricted long-term investments	252,000,000		252,000,000		236,000,000
Level 1 | Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	354,000,000		354,000,000		335,000,000
Level 2
Fair Value of Other Financial Instruments
Restricted long-term investments	412,000,000		412,000,000		357,000,000
Restricted long-term investments, cost basis	463,000,000		463,000,000		437,000,000
Level 2 | Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	323,000,000		323,000,000		298,000,000
Fair Value
Fair Value of Other Financial Instruments
Restricted long-term investments	664,000,000		664,000,000		593,000,000
Unrealized holding gains (losses)	3,000,000	$ (71,000,000)	37,000,000	$ (131,000,000)
Fair value note receivable	680,000,000		680,000,000		752,000,000
Carrying value
Fair Value of Other Financial Instruments
Non-current notes receivable	$ 680,000,000		$ 680,000,000		$ 752,000,000

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The cost of the restricted investment.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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