INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 2,434	$ 2,233	$ 5,279	$ 4,898
Other income (expense), net	72	62	107	(192)
Net income (loss)	455	2,305	1,383	3,252
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	1,147	1,090	2,286	2,162
Operating expenses	(836)	(767)	(1,665)	(1,568)
Operating income	311	323	621	594
Interest expense	(102)	(102)	(204)	(203)
Income tax expense	(34)	(37)	(70)	(65)
Net income (loss)	167	173	332	302
Noncontrolling interest held by TTI	(34)	(35)	(67)	(61)
Earnings attributable to Sempra Energy	$ 133	$ 138	$ 265	$ 241