OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	$ 14	$ 8
AFUDC related to equiity	35	19
Other capitalized financing costs	11	6
Total capitalized financing costs	60	33
San Diego Gas and Electric Company and Subsidiary [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	12	6
AFUDC related to equiity	29	15
Total capitalized financing costs	41	21
Southern California Gas Company [Member]
Capitalized Financing Costs Disclosure [Line Items]
AFUDC related to debt	2	2
AFUDC related to equiity	6	4
Total capitalized financing costs	$ 8	$ 6