INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2017	Mar. 31, 2017	Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equitization of note receivable due from unconsolidated affiliate		$ 19	$ 0	[1]
Maximum exposure under guarantor obligations		4,400
Aggregate carrying value of guarantor obligations		48
Sempra Mexico [Member] | Infraestructura Marina del Golfo [Member]
Schedule of Equity Method Investments [Line Items]
Investments made during period		46
Joint Venture [Member] | Sempra South American Utilities [Member] | Eletrans [Member]
Schedule of Equity Method Investments [Line Items]
Equitization of note receivable due from unconsolidated affiliate	$ 19
Joint Venture [Member] | Sempra Renewables [Member]
Schedule of Equity Method Investments [Line Items]
Investments made during period			15
Joint Venture [Member] | Sempra LNG & Midstream [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Investments made during period		1
Capitalized interest		$ 11	$ 12

[1] As adjusted for the adoption of ASU 2016-09 as of January 1, 2016.