SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - GOODWILL (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,397	$ 2,364
Acquisition of business – measurement period adjustment		(13)
Acquisition of business	38
Foreign currency translation	(62)	46
Goodwill, ending balance	2,373	2,397
Sempra South American Utilities [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	795	749
Acquisition of business – measurement period adjustment		0
Acquisition of business	38
Foreign currency translation	(62)	46
Goodwill, ending balance	771	795
Sempra Mexico [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	1,602	1,615
Acquisition of business – measurement period adjustment		(13)
Acquisition of business	0
Foreign currency translation	0	0
Goodwill, ending balance	$ 1,602	$ 1,602