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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Fair Value of Other Financial Instruments |  |  |  |
FMVA investments | $ 52 | $ 52 |  | $ 52
Long-term debt, carrying value | 70,000 | 70,000 |  | 66,100
Long-term debt | 76,500 | 76,500 |  | 75,100
PennEast Pipeline Company, L.L.C. |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Carrying value of investment | $ 11 | $ 11 |  | 116
Ownership interest (percent) | 20.00% | 20.00% |  |
Southeast Supply Header, LLC |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Carrying value of investment | $ 83 | $ 83 |  | 84
Ownership interest (percent) | 50.00% | 50.00% |  |
Steckman Ridge, LP |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Carrying value of investment | $ 88 | $ 88 |  | 90
Ownership interest (percent) | 50.00% | 50.00% |  |
Noverco |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Ownership interest (percent) | 38.90% | 38.90% |  |
Net investment hedges |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt |  | $ 18 | $ (226) |
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts |  | 0 | 13 |
Realized loss associated with the settlement of foreign exchange forward contracts |  | 0 | $ 15 |
Preferred share investment |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Available-for-sale investment, fair value | $ 580 | 580 |  |
Held to maturity investment, fair value |  |  |  | 567
Gains (losses) recognized in OCI upon reclassification | 0 |  |  |
Fair Value |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Restricted long-term investments held in trust | 575 | 575 |  | 553
Carrying value |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Noncurrent notes receivable | $ 1,000 | $ 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=123874694&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=122636397&loc=SL7495116-110257 + Details
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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=120253306&loc=d3e28129-110885 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32022-110900 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123602790&loc=d3e30304-110892 + Details
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