OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	$ 8	$ 7	$ 15	$ 13
AFUDC related to equity	30	31	57	58
Other capitalized financing costs	20	17	38	34
Total capitalized financing costs	58	55	110	105
San Diego Gas and Electric Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	4	4	8	7
AFUDC related to equity	13	10	24	18
Total capitalized financing costs	17	14	32	25
Southern California Gas Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	4	3	7	6
AFUDC related to equity	10	10	20	19
Total capitalized financing costs	$ 14	$ 13	$ 27	$ 25