DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE COMMODITY VOLUMES (Details) MWh in Millions, MMBTU in Millions |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2018
MWh
MMBTU
|
Dec. 31, 2017
MWh
MMBTU
|
|
| SDG&E [Member] | Natural gas [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Net derivative energy volumes | 33 | 39 |
| SDG&E [Member] | Electricity [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Net derivative energy volumes | MWh | 3 | 3 |
| SDG&E [Member] | Congestion revenue rights [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Net derivative energy volumes | MWh | 57 | 59 |
| Sempra LNG & Midstream [Member] | Natural gas [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Net derivative energy volumes | 5 | 3 |
| Sempra Mexico [Member] | Natural gas [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Net derivative energy volumes | 17 | 4 |