OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	$ 7	$ 6
AFUDC related to equity	27	27
Other capitalized financing costs	18	17
Total capitalized financing costs	52	50
San Diego Gas and Electric Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	4	3
AFUDC related to equity	11	8
Total capitalized financing costs	15	11
Southern California Gas Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	3	3
AFUDC related to equity	10	9
Total capitalized financing costs	$ 13	$ 12