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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 54B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482134/820-10-35-54B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition 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. + References No definition available. + Details
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