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INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - USD ($) $ in Millions			12 Months Ended
	Nov. 15, 2017	Sep. 26, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 13, 2018	Nov. 14, 2017	Sep. 25, 2016	May 31, 2016	May 09, 2016	Mar. 31, 2016	Mar. 29, 2016
Oncor Holdings Electric Delivery Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Gross revenue			$ 3,347
Operating expense			(2,434)
Income from operations			913
Interest expense			(285)
Income tax expense			(119)
Net income/earnings			455
Noncontrolling interest held by TTI			(94)
Earnings attributable to Sempra Energy			360
Current assets			772
Noncurrent assets			21,980
Current liabilities			2,217
Noncurrent liabilities			11,756
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Gross revenue			727	$ 846	$ 1,079
Operating expense			(614)	(590)	(726)
Income from operations			113	256	353
Interest expense			(330)	(217)	(127)
Net income/earnings			(33)	116	$ 252
Current assets			625	974
Noncurrent assets			14,803	14,087
Current liabilities			813	797
Noncurrent liabilities			$ 10,226	$ 9,809
Sempra LNG & Midstream [Member] | Rockies Express [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee									25.00%	25.00%	25.00%	25.00%
Sempra Renewables [Member] | Broken Bow 2 Wind [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee						50.00%
IEnova [Member] | Ductos Energéticos del Norte [Member] | Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee							50.00%
Ownership percentage before acquisition							50.00%
Acquired percentage interest	50.00%
Ownership percentage in consolidated entity	100.00%
IEnova [Member] | IEnova Pipelines [Member] | Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage before acquisition								50.00%
Acquired percentage interest		50.00%
Ownership percentage in consolidated entity		100.00%

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