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DEBT AND CREDIT FACILITIES - WEIGHTED-AVERAGE INTEREST RATES AND INTEREST RATE SWAPS (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2018
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Sempra Energy Consolidated [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate on total short-term debt outstanding | 3.07% |  | 2.99%
San Diego Gas and Electric Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate on total short-term debt outstanding | 2.80% |  | 2.97%
Southern California Gas Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate on total short-term debt outstanding | 2.49% |  | 2.58%
Interest Rate Swap, maturing in March 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notional amount of derivative |  | $ 850 |
Fixed interest rate |  | 3.069% |

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