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DERIVATIVE FINANCIAL INSTRUMENTS - COMMODITY VOLUMES (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 MWh MMBTU | Dec. 31, 2017 MWh MMBTU
Natural Gas Derivative [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount, Energy Measure | MMBTU | 35 | 46
Electric Energy Derivative [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount, Energy Measure | 2 | 3
Congestion Revenue Rights Derivative [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount, Energy Measure | 52 | 59
SDG&E [Member] | Natural Gas Derivative [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount, Energy Measure | MMBTU | 33 | 39
SDG&E [Member] | Electric Energy Derivative [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount, Energy Measure | 2 | 3
SDG&E [Member] | Congestion Revenue Rights Derivative [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount, Energy Measure | 52 | 59

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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