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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Property, plant and equipment related to VIE $ 482 $ 494
Long-term debt related to VIE 340 345
Shareholders' equity:    
Preferred stock, shares authorized 50 50
Common stock, shares authorized 750 750
Common stock, shares outstanding 242 240
San Diego Gas and Electric Company and Subsidiary [Member]
   
Property, plant and equipment related to VIE 482 494
Long-term debt related to VIE $ 340 $ 345
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