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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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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 tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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The aggregate value of all restricted investments.

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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, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value of Other Financial Instruments
FMVA investments	$ 176		$ 173
Restricted long-term investments	743		717
Long-term debt, carrying value	87,600		81,200
Long-term debt	84,600		78,100
Debt Securities
Fair Value of Other Financial Instruments
Debt securities, available-for-sale, amortized cost	247		279
Equity Funds And Debt Securities
Fair Value of Other Financial Instruments
Unrealized gain on investment	16	$ 15
Level 1
Fair Value of Other Financial Instruments
Restricted long-term investments	293		263
Level 1 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	312		287
Level 2
Fair Value of Other Financial Instruments
Restricted long-term investments	450		454
Restricted long-term investments, cost basis	507		486
Level 2 \| Debt Securities
Fair Value of Other Financial Instruments
Fair value of investments	251		284
Fair Value
Fair Value of Other Financial Instruments
Restricted long-term investments	743		717
Unrealized holding gains (losses)	(13)	34
Fair value note receivable	53		53
Carrying value
Fair Value of Other Financial Instruments
Non-current notes receivable	53		$ 53
Net investment hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt	(377)	59
Realized loss associated with the settlement of foreign exchange forward contracts	$ 0	$ 44