INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 1,072	$ 1,016
Operating expense	(801)	(775)
Income from operations	271	241
Interest expense	(101)	(86)
Income tax expense	(28)	(23)
Net income / Earnings	129	114
Noncontrolling interest held by TTI	(26)	(23)
Earnings attributable to Sempra Energy	103	91
IMG [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	122	0
Operating expense	(33)	0
Income from operations	89	0
Other income, net	364	41
Interest expense	(43)	(46)
Income tax expense	10	(4)
Net income / Earnings	$ 420	$ (8)