INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - Oncor Holdings [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 236	$ 1,016
Operating expense	(185)	(775)
Income from operations	51	241
Interest expense	(22)	(86)
Income tax expense	(7)	(23)
Net income / Earnings	19	114
Noncontrolling interest held by TTI	(4)	(23)
Earnings attributable to Sempra Energy	$ 15	$ 91