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ACQUISTION AND DIVESTITURE ACTIVITY - Sempra Renewables (Details) - Sempra Renewables [Member] $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Jul. 10, 2017 USD ($) | Jul. 01, 2016 USD ($) MW | Dec. 31, 2016 USD ($)
Great Valley Solar [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration (fair value of total consideration) | $ 124 |  |
Huron County, Michigan [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration (fair value of total consideration) |  | $ 18 | $ 4
Ownership percentage in consolidated entity |  | 100.00% |
Generating capacity (in mw) | MW |  | 100 |
Power purchase agreement term |  | 15 years |
Consideration transferred |  | $ 22 |

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