RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Fair Value of Other Financial Instruments
Equity investments at carrying value	$ 173	$ 102
Long-term debt	78,100	73,500
Foreign exchange contracts
Fair Value of Other Financial Instruments
Amount of unrealized gain/(loss) recognized in OCI	0	0
Realized gain on AOCI	0	0
Equity Funds And Debt Securities
Fair Value of Other Financial Instruments
Unrealized gain (loss) on investments	34	(26)
Level 1 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	287	335
Level 2
Fair Value of Other Financial Instruments
Investment owned restricted cost	279	295
Level 2 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	284	298
Net investment hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt	645	(954)
Realized loss associated with the settlement of foreign exchange forward contracts	236	21
Carrying value
Fair Value of Other Financial Instruments
Long-term debt	81,200	79,300
Long-term loans receivable from affiliates	53	752
Fair Value
Fair Value of Other Financial Instruments
Fair value note receivable	$ 53	$ 752

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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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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount, after allowance for credit loss, of financing receivable, classified as noncurrent.

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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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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Amount, before adjustments, of tax expense (benefit) for gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from derivative designated and qualifying as net investment hedge.

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Amount of unrealized gain (loss) on investment.

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