COMMITMENTS AND CONTINGENCIES - CONTRACTUAL COMMITMENTS (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
SoCalGas [Member] | Natural Gas Minimum Purchase Obligation Contracts [Member]
Loss Contingencies [Line Items]
Increase in contractual commitments	$ 54
Change in 2020	11
Change in 2021	43
SoCalGas [Member] | Natural Gas Interstate Pipeline Capacity Agreements [Member]
Loss Contingencies [Line Items]
Increase in contractual commitments	597
Change in 2020	(90)
Change in 2021	17
Change in 2022	88
Change in 2023	100
Change in 2024	90
Change thereafter	392
Sempra LNG [Member] | Natural Gas Storage and Transportation Contracts [Member]
Loss Contingencies [Line Items]
Increase in contractual commitments	567
Change in 2020	(44)
Change in 2021	73
Change in 2022	38
Change in 2023	34
Change in 2024	30
Change thereafter	436
Sempra LNG [Member] | Liquefied Natural Gas Contracts [Member]
Loss Contingencies [Line Items]
Change in 2020	(238)
Change in 2021	94
Change in 2022	40
Change in 2023	7
Change in 2024	(12)
Change thereafter	$ (56)