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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Fair Value of Other Financial Instruments |  |  |
FMVA investments | $ 52 |  | $ 52
Long-term debt, carrying value | 67,000 |  | 66,100
Long-term debt | 72,500 |  | 75,100
Net Investment Hedges |  |  |
Fair Value of Other Financial Instruments |  |  |
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt | 105 | $ (708) |
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts | 0 | $ (7) |
Preferred share investment |  |  |
Fair Value of Other Financial Instruments |  |  |
Held to maturity investment at amortized cost | $ 566 |  | 567
Cumulative dividends based on average yield of Government of Canada bonds, maturity period of bonds | 10 years |  |
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent) | 4.38% |  |
Held to maturity investment, fair value | $ 566 |  | 567
Fair Value |  |  |
Fair Value of Other Financial Instruments |  |  |
Restricted long-term investments held in trust | 529 |  | 553
Carrying value |  |  |
Fair Value of Other Financial Instruments |  |  |
Noncurrent notes receivable | $ 1,000 |  | $ 1,100

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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