INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 2,301	$ 2,398	$ 7,199	$ 6,808
Net income (loss)	421	909	3,673	1,862
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	1,232	1,211	3,394	3,268
Operating expenses	(819)	(787)	(2,387)	(2,319)
Operating income	413	424	1,007	949
Interest expense	(102)	(97)	(305)	(276)
Income tax expense	(50)	(53)	(115)	(106)
Net income (loss)	255	261	557	511
Noncontrolling interest held by TTI	(50)	(52)	(111)	(102)
Earnings attributable to Sempra Energy	$ 205	$ 209	$ 446	$ 409