QUARTERLY FINANCIAL DATA (UNAUDITED) - Narrative (Details) - USD ($) $ in Millions		1 Months Ended			12 Months Ended
	Apr. 22, 2019	Apr. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Significant Items Affecting Quarterly Results [Line Items]
Gain on sale of assets			$ 513		$ 63	$ 513	$ 2
Gain on sale of assets, net of tax			367
Disposal Group Held-for-sale [Member]
Significant Items Affecting Quarterly Results [Line Items]
Asset impairment charges				$ (1,500)
Asset impairment charges, net of taxes and noncontrolling interests				(900)
Disposal Group Held-for-sale [Member] | Sempra Renewables [Member]
Significant Items Affecting Quarterly Results [Line Items]
Asset impairment charges				(200)
Asset impairment charges, net of taxes and noncontrolling interests				(145)
Disposal Group Held-for-sale [Member] | Sempra LNG [Member]
Significant Items Affecting Quarterly Results [Line Items]
Asset impairment charges			183	(1,300)		(1,100)
Asset impairment charges, net of taxes and noncontrolling interests			$ 126	$ (755)		$ (629)
Disposal Group Held-for-sale [Member] | Wind Generation Projects [Member] | Sempra Renewables [Member]
Significant Items Affecting Quarterly Results [Line Items]
Gain on sale of assets	$ 61	$ 61
Gain on sale of assets, after tax	$ 45	$ 45
R B S Sempra Commodities [Member]
Significant Items Affecting Quarterly Results [Line Items]
Investment in RBS Sempra Commodities								$ 65