INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 2,233	$ 1,895	$ 4,898	$ 4,410
Net income (loss)	2,305	435	3,252	953
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	1,090	1,041	2,162	2,057
Operating expenses	(767)	(757)	(1,568)	(1,532)
Operating income	323	284	594	525
Interest expense	(102)	(93)	(203)	(179)
Income tax expense	(37)	(30)	(65)	(53)
Net income (loss)	173	136	302	250
Noncontrolling interest held by TTI	(35)	(27)	(61)	(50)
Earnings attributable to Sempra Energy	$ 138	$ 109	$ 241	$ 200