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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 CAD ($) | Sep. 30, 2018 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($)
Fair Value of Other Financial Instruments |  |  |  |
FMVA investments | $ 98,000,000 |  | $ 102,000,000 |
Long-term debt, carrying value | 65,700,000,000 |  | 63,900,000,000 |
Long-term debt | 71,800,000,000 |  | 64,400,000,000 |
Net Investment Hedges |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt | 166,000,000 | $ (209,000,000) |  |
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts | 1,000,000 |  |  |
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts |  | 36,000,000 |  |
Realized gain (loss) associated with the settlement of foreign exchange forward contracts | 0 |  |  |
Realized gain (loss) associated with the settlement of foreign exchange forward contracts |  | (46,000,000) |  |
Realized gain (loss) associated with the settlement of United Stated dollar denominated debt that matured | 0 | $ (13,000,000) |  |
Preferred share investment |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Held to maturity investment at amortized cost | $ 580,000,000 |  | 478,000,000 |
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 | $ 580,000,000 |  |  | $ 580
Fair Value |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Restricted long-term investments held in trust | 413,000,000 |  | 323,000,000 |
Noncurrent notes receivable | 94,000,000 |  | 97,000,000 |
Carrying value |  |  |  |
Fair Value of Other Financial Instruments |  |  |  |
Noncurrent notes receivable | $ 94,000,000 |  | $ 97,000,000 |

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