INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 2,560	$ 2,301	$ 7,839	$ 7,199
Other (expense) income, net	(55)	29	52	(163)
Net income (loss)	(632)	421	751	3,673
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	1,286	1,232	3,572	3,394
Operating expenses	(866)	(819)	(2,531)	(2,387)
Operating income	420	413	1,041	1,007
Interest expense	(104)	(102)	(308)	(305)
Income tax expense	(54)	(50)	(124)	(115)
Net income (loss)	255	255	587	557
Noncontrolling interest held by TTI	(51)	(50)	(118)	(111)
Earnings attributable to Sempra Energy	$ 204	$ 205	$ 469	$ 446