OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	$ 6	$ 5	$ 17	$ 32
AFUDC related to equiity	14	13	44	80
Other capitalized financing costs	9	13	22	40
Total capitalized financing costs	29	31	83	152
San Diego Gas and Electric Company and Subsidiary [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	4	3	12	26
AFUDC related to equiity	10	6	30	61
Total capitalized financing costs	14	9	42	87
Southern California Gas Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	2	2	5	6
AFUDC related to equiity	4	7	14	19
Total capitalized financing costs	$ 6	$ 9	$ 19	$ 25