RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Fair Value of Other Financial Instruments
Equity investments at carrying value	$ 187	$ 173
Long-term debt	98,900	78,100
Equity Funds And Debt Securities
Fair Value of Other Financial Instruments
Unrealized gain (loss) on investments	(16)	34
Level 1 \| Equity funds
Fair Value of Other Financial Instruments
Fair value of investments	114	287
Level 2
Fair Value of Other Financial Instruments
Investment owned restricted cost	1,100	279
Level 2 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	1,100	284
Carrying value
Fair Value of Other Financial Instruments
Long-term debt	101,600	81,200
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
Net investment hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt	(1,185)	645
Realized loss associated with the settlement of foreign exchange forward contracts	$ 120	$ 236

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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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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