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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Property, plant and equipment related to VIE $ 445 $ 466
Long-term debt related to VIE 327 335
Shareholders' equity:    
Preferred stock, shares authorized 50 50
Preferred stock, shares issued 0 0
Common stock, shares authorized 750 750
Common stock, shares outstanding 244 242
San Diego Gas and Electric Company and Subsidiary [Member]
   
Property, plant and equipment related to VIE 445 466
Long-term debt related to VIE $ 327 $ 335
Shareholders' equity:    
Common stock, shares authorized 255 255
Common stock, shares outstanding 117 117
Southern California Gas Company [Member]
   
Shareholders' equity:    
Common stock, shares authorized 100 100
Common stock, shares outstanding 91 91