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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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Amount of unrealized gain (loss) on investment.

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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Fair Value of Other Financial Instruments
FMVA investments	$ 186		$ 187
Long-term debt	101,400		98,900
Equity Funds And Debt Securities
Fair Value of Other Financial Instruments
Unrealized gain on investment	1	$ 16
Level 1 \| Equity Funds
Fair Value of Other Financial Instruments
Fair value of investments	0		114
Level 2
Fair Value of Other Financial Instruments
Restricted long-term investments, cost basis	1,100		1,100
Level 2 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	1,100		1,100
Carrying Value
Fair Value of Other Financial Instruments
Long-term debt	102,700		$ 101,600
Net investment hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange (loss) gain on translation of United States dollar denominated debt	47	(377)
Realized loss associated with the settlement of foreign exchange forward contracts	$ 81	$ 0