OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	$ 6	$ 5	$ 19	$ 15
AFUDC related to equity	26	28	84	77
Other capitalized financing costs	18	6	52	22
Total capitalized financing costs	50	39	155	114
San Diego Gas and Electric Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	3	3	10	10
AFUDC related to equity	9	8	27	26
Total capitalized financing costs	12	11	37	36
Southern California Gas Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	3	2	9	5
AFUDC related to equity	10	7	29	18
Other capitalized financing costs	1	0	1	0
Total capitalized financing costs	$ 14	$ 9	$ 39	$ 23