OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	$ 7	$ 4	$ 13	$ 10
AFUDC related to equity	31	24	58	49
Other capitalized financing costs	17	8	34	16
Total capitalized financing costs	55	36	105	75
San Diego Gas and Electric Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	4	3	7	7
AFUDC related to equity	10	7	18	18
Total capitalized financing costs	14	10	25	25
Southern California Gas Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	3	1	6	3
AFUDC related to equity	10	6	19	11
Total capitalized financing costs	$ 13	$ 7	$ 25	$ 14