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REGULATORY MATTERS - GENERAL RATE CASE (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Oct. 06, 2017 | Apr. 30, 2018 | Mar. 31, 2019
San Diego Gas and Electric Company [Member] |  |  |
General Rate Case [Line Items] |  |  |
GRC requested revenue requirement | $ 2,203 | $ 1,918 |
GRC requested revenue requirement adjustment | 221 | $ 64 |
Tax Cuts and Jobs Act, change in tax rate, change in revenue requirement |  |  | $ 58
Proposed annual attrition percentage |  | 4.00% |
San Diego Gas and Electric Company [Member] | General Rate Case [Member] |  |  |
General Rate Case [Line Items] |  |  |
Tracked income tax expense liability |  |  | 90
San Diego Gas and Electric Company [Member] | Future Refund of Rates to Customers [Member] |  |  |
General Rate Case [Line Items] |  |  |
Regulatory liability |  |  | 95
San Diego Gas and Electric Company [Member] | Future Refund of Rates to Customers - FERC [Member] |  |  |
General Rate Case [Line Items] |  |  |
Regulatory liability |  |  | 85
Southern California Gas Company [Member] |  |  |
General Rate Case [Line Items] |  |  |
GRC requested revenue requirement | 2,937 | $ 2,695 |
GRC requested revenue requirement adjustment | $ 481 | $ 239 |
Tax Cuts and Jobs Act, change in tax rate, change in revenue requirement |  |  | 58
Southern California Gas Company [Member] | General Rate Case [Member] |  |  |
General Rate Case [Line Items] |  |  |
Tracked income tax expense liability |  |  | 95
Southern California Gas Company [Member] | Future Refund of Rates to Customers [Member] |  |  |
General Rate Case [Line Items] |  |  |
Regulatory liability |  |  | $ 91
Minimum [Member] | San Diego Gas and Electric Company [Member] |  |  |
General Rate Case [Line Items] |  |  |
GRC requested revenue requirement adjustment percentage | 5.00% |  |
Minimum [Member] | Southern California Gas Company [Member] |  |  |
General Rate Case [Line Items] |  |  |
GRC requested revenue requirement adjustment percentage | 6.00% |  |
Proposed annual attrition percentage |  | 4.00% |
Maximum [Member] | San Diego Gas and Electric Company [Member] |  |  |
General Rate Case [Line Items] |  |  |
GRC requested revenue requirement adjustment percentage | 7.00% |  |
Maximum [Member] | Southern California Gas Company [Member] |  |  |
General Rate Case [Line Items] |  |  |
GRC requested revenue requirement adjustment percentage | 8.00% |  |
Proposed annual attrition percentage |  | 5.00% |
Otay Mesa Energy Center [Member] | San Diego Gas and Electric Company [Member] |  |  |
General Rate Case [Line Items] |  |  |
Owning and operating costs |  | $ 68 |

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