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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - AFFILIATES REVENUE AND COST OF SALES (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) MW | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |
Related party revenue | $ 64 | $ 43 | $ 25
Related party cost of sales | 46 | 47 | 72
San Diego Gas and Electric Company [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related party revenue | 5 | 8 | 7
Related party cost of sales | 73 | 71 | 64
Southern California Gas Company [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related party revenue | $ 64 | $ 74 | $ 76
Energia Sierra Juarez Wind Project [Member] | San Diego Gas and Electric Company [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Power purchase agreement term | 20 years |  |
Generating capacity (in mw) | MW | 155 |  |
Minimum [Member] | Federal Funds Rate [Member] | California Utilities [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Variable percentage rate | 0.13% |  |
Maximum [Member] | Federal Funds Rate [Member] | California Utilities [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Variable percentage rate | 0.20% |  |

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