v3.6.0.2

SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - AFFILIATES REVENUE AND COST OF SALES (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2016 | Dec. 31, 2016 USD ($) MW | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Related party revenue |  | $ 25 | $ 26 | $ 13
Related party cost of sales |  | 72 | 107 | 78
San Diego Gas and Electric Company [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party revenue |  | 7 | 10 | 13
Related party cost of sales |  | $ 64 | 49 | 17
San Diego Gas and Electric Company [Member] | Energia Sierra Juarez Wind Project [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Power purchase agreement term | 20 years |  |  |
Generating capacity (in mw) | MW |  | 155 |  |
Southern California Gas Company [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party revenue |  | $ 76 | $ 75 | $ 69
Minimum [Member] | Federal Funds Rate [Member] | California Utilities [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Variable percentage rate |  | 13.00% |  |
Maximum [Member] | Federal Funds Rate [Member] | California Utilities [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Variable percentage rate |  | 20.00% |  |

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