DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE COMMODITY VOLUMES (Details) MWh in Millions, MMBTU in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017 MWh MMBTU	Dec. 31, 2016 MWh MMBTU
SDG&E [Member] | Natural gas [Member]
Derivatives, Fair Value [Line Items]
Net derivative energy volumes	44	48
SDG&E [Member] | Electricity [Member]
Derivatives, Fair Value [Line Items]
Net derivative energy volumes | MWh	4	4
SDG&E [Member] | Congestion revenue rights [Member]
Derivatives, Fair Value [Line Items]
Net derivative energy volumes | MWh	42	48
SoCalGas [Member] | Natural gas [Member]
Derivatives, Fair Value [Line Items]
Net derivative energy volumes	0	1
Sempra LNG & Midstream [Member] | Natural gas [Member]
Derivatives, Fair Value [Line Items]
Net derivative energy volumes	14	31
Sempra Mexico [Member] | Natural gas [Member]
Derivatives, Fair Value [Line Items]
Net derivative energy volumes	3	0