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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - OTHER FINANCIAL INSTRUMENTS (Details) - CAD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value of Other Financial Instruments |  |  |  |
Equity investments at carrying value |  | $ 52,000,000 | $ 99,000,000 |
Impairment of equity investments |  | 2,351,000,000 | 0 | $ 0
Restricted long-term investments |  | 553,000,000 | 434,000,000 |
Long-term debt |  | 75,100,000,000 | 70,500,000,000 |
Long-term loans receivable from affiliates |  | 1,100,000,000 | 1,000,000,000.0 |
Net Investment Hedges |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt |  | (117,000,000) | 317,000,000 |
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts |  | 13,000,000 | 2,000,000 |
Realized loss associated with the settlement of foreign exchange forward contracts |  | 15,000,000 | 0 |
Realized gain (loss) associated with the settlement of United Stated dollar denominated debt that matured |  | 0 | 0 |
Carrying value |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Long-term debt |  | 66,100,000,000 | 64,400,000,000 |
Preference shares (Note 21) |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Held-to-maturity securities |  | $ 567,000,000 | 580,000,000 |
Cumulative dividends based on average yield of Government of Canada bonds, maturity period of bonds |  | 10 years |  |
Held to maturity preferred share investment |  | $ 567,000,000 | 580,000,000 |
Noverco Common Shares | Preference shares (Note 21) |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent) |  | 4.38% |  |
DCP Midstream, LP |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Impairment of equity investments | $ 1,700,000,000 |  |  |
Equity investment |  | $ 331,000,000 |  |
Southeast Supply Header L.L.C. |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Impairment of equity investments |  | 394,000,000 |  |
Equity investment |  | $ 84,000,000 | 484,000,000 |
Southeast Supply Header L.L.C. | Measurement Input, Weighted Average Cost of Capital [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Equity Method Investment, Measurement Input |  | 8.00% |  |
Southeast Supply Header L.L.C. | Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Equity Method Investment, Measurement Input |  | 0.50% |  |
Steckman Ridge, LP |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Impairment of equity investments |  | $ 221,000,000 |  |
Equity investment |  | $ 90,000,000 | $ 222,000,000 |
Steckman Ridge, LP | Measurement Input, Weighted Average Cost of Capital [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Equity Method Investment, Measurement Input |  | 9.00% |  |
Steckman Ridge, LP | Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Equity Method Investment, Measurement Input |  | 1.00% |  |

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