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ACQUISITIONS AND DISPOSITIONS - Other Acquisitions (Narrative) (Details) $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 02, 2016 CAD ($) | Nov. 02, 2016 USD ($) | Sep. 09, 2016 CAD ($) MW | Sep. 09, 2016 USD ($) MW | Feb. 27, 2015 CAD ($) | Feb. 27, 2015 USD ($) | Nov. 30, 2015 CAD ($) MW | Nov. 30, 2015 USD ($) MW | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Nov. 02, 2016 USD ($) | Sep. 09, 2016 USD ($) | Nov. 30, 2015 USD ($) | Feb. 27, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 644,000,000 |  |  |  |
Chapman Ranch |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  | 100.00% |  |  |  |  |  |  |  |  |  | 100.00% |  |
Capacity acquired (in megawatts) | MW |  |  | 249 | 249 |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 40,000,000 | $ 30 | $ 65,000,000 | $ 50 |  |  |  |  |  |  |  |  |  |  |
Purchase price allocated to property, plant and equipment | 23,000,000 |  | $ 62,000,000 |  |  |  |  |  |  |  |  | $ 17 | $ 48 |  |
Pro forma effect on earnings | $ | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Creek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  | 100.00% |
Capacity acquired (in megawatts) | MW |  |  |  |  |  |  | 103 | 103 |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 48,000,000 | $ 36 |  |  |  |  |  |  |
Purchase price allocated to property, plant and equipment |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |  | $ 26 |
Midstream Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 106,000,000 | $ 85 |  |  |  |  |  |  |  |  |
Purchase price allocated to property, plant and equipment |  |  |  |  | 69,000,000 |  |  |  |  |  |  |  |  |  | $ 55
Contingent future payment (up to) |  |  |  |  | $ 21,000,000 |  |  |  |  |  |  |  |  |  | $ 17

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- Definition The pro forma earnings before interest and income taxes for the period as if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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