OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	$ 5	$ 13	$ 11	$ 27
AFUDC related to equiity	15	32	30	67
Other capitalized financing costs	8	16	13	27
Total capitalized financing costs	28	61	54	121
San Diego Gas and Electric Company and Subsidiary [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	4	11	8	23
AFUDC related to equiity	10	26	20	55
Total capitalized financing costs	14	37	28	78
Southern California Gas Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	1	2	3	4
AFUDC related to equiity	5	6	10	12
Total capitalized financing costs	$ 6	$ 8	$ 13	$ 16