INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - Oncor Holdings [Member] - USD ($) $ in Millions	3 Months Ended		4 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 1,211	$ 1,095	$ 2,352	$ 3,268
Operating expense	(787)	(748)	(1,663)	(2,319)
Income from operations	424	347	689	949
Interest expense	(97)	(89)	(198)	(276)
Income tax expense	(53)	(53)	(105)	(106)
Net income / Earnings	261	191	351	511
Noncontrolling interest held by TTI	(52)	(38)	(70)	(102)
Earnings attributable to Sempra Energy	$ 209	$ 153	$ 281	$ 409