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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Fair Value of Other Financial Instruments |  |  |  |
FMVA investments |  | $ 56 |  | $ 99
Long-term debt, carrying value |  | 66,900 |  | 64,400
Long-term debt |  | 74,100 |  | 70,500
Southeast Supply Header, LLC |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Carrying value of investment |  | $ 87 |  | 484
Southeast Supply Header, LLC | Weighted Average Cost of Capital | Discounted Cash Flow Model |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Fair value measurement input (percent) |  | 8.00% |  |
Southeast Supply Header, LLC | Long-term Revenue Growth Rate | Discounted Cash Flow Model |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Fair value measurement input (percent) |  | 0.50% |  |
Steckman Ridge, LP |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Carrying value of investment |  | $ 96 |  | 222
Steckman Ridge, LP | Weighted Average Cost of Capital | Discounted Cash Flow Model |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Fair value measurement input (percent) |  | 9.00% |  |
Steckman Ridge, LP | Long-term Revenue Growth Rate | Discounted Cash Flow Model |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Fair value measurement input (percent) |  | 1.00% |  |
Net Investment Hedges |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt |  | $ (226) | $ 166 |
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts | $ 13 |  | 1 |
Net Investment Hedges | Foreign exchange contracts |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Realized gain (loss) associated with the settlement of United Stated dollar denominated debt that matured |  | (15) | 0 |
Net Investment Hedges | United States Dollar Denominated Debt |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Realized gain (loss) associated with the settlement of United Stated dollar denominated debt that matured |  | 0 | $ 0 |
Preferred share investment |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Held to maturity investment at amortized cost |  | $ 566 |  | 580
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 |  | 580
Fair Value |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Restricted long-term investments held in trust |  | 527 |  | 434
Carrying value |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Noncurrent notes receivable |  | $ 1,100 |  | $ 1,000

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