INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - Oncor Holdings [Member] - USD ($) $ in Millions	3 Months Ended		4 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 1,041	$ 1,021	$ 1,257	$ 2,057
Operating expense	(757)	(730)	(915)	(1,532)
Income from operations	284	291	342	525
Interest expense	(93)	(87)	(109)	(179)
Income tax expense	(30)	(45)	(52)	53
Net income / Earnings	136	141	160	250
Noncontrolling interest held by TTI	(27)	(28)	(32)	(50)
Earnings attributable to Sempra Energy	$ 109	$ 113	$ 128	$ 200