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LONG-TERM INVESTMENTS - Narrative (Details) shares in Millions, $ in Millions, $ in Billions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 CAD ($) shares | Feb. 29, 2016 shares | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Goodwill of investee | $ 2,200 |  | $ 2,200 | $ 2,000 |  |
Amortizable assets of investee | $ 706 |  | 706 | 643 |  |
Dividends received from equity investments |  |  | $ 2,800 | 1,400 | $ 825 |
Gas Transmission and Midstream | Sabal Trail |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |  |  |
Equity Method Investments, fair value |  |  |  | $ 2,300 |  | $ 1.9
Common shares | Noverco |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) | 38.90% |  | 38.90% | 38.90% |  | 38.90%
Reciprocal shareholding (as a percent) | 1.40% |  | 1.40% | 1.90% |  | 1.90%
Equity Method Investment, number of shares sold (in shares) | shares | 4.4 |  |  |  |  |
Equity Method Investment, number of shares purchased (in shares) | shares |  | 1.2 |  |  |  |
Indirect pro-rata interest (as a percent) | 0.50% |  | 0.50% | 0.70% |  | 0.70%
Reduction from reciprocal shareholding |  |  | $ 88 | $ 102 |  |
Preference shares | Noverco |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Maturity period |  |  | 10 years |  |  |
Margin (as a percent) | 4.38% |  | 4.38% |  |  |

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