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OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Capitalized Financing Costs Disclosure [Line Items]        
AFUDC related to debt $ 4 $ 5 $ 10 $ 11
AFUDC related to equity 24 15 49 30
Other capitalized financing costs 8 8 16 13
Total capitalized financing costs 36 28 75 54
San Diego Gas and Electric Company and Subsidiary [Member]
       
Capitalized Financing Costs Disclosure [Line Items]        
AFUDC related to debt 3 4 7 8
AFUDC related to equity 7 10 18 20
Total capitalized financing costs 10 14 25 28
Southern California Gas Company [Member]
       
Capitalized Financing Costs Disclosure [Line Items]        
AFUDC related to debt 1 1 3 3
AFUDC related to equity 6 5 11 10
Total capitalized financing costs $ 7 $ 6 $ 14 $ 13