OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	$ 6	$ 14
AFUDC related to equiity	15	35
Other capitalized financing costs	5	11
Total capitalized financing costs	26	60
San Diego Gas and Electric Company and Subsidiary [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	4	12
AFUDC related to equiity	10	29
Total capitalized financing costs	14	41
Southern California Gas Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	2	2
AFUDC related to equiity	5	6
Total capitalized financing costs	$ 7	$ 8