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OTHER FINANCIAL DATA - GOODWILL (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Goodwill by Segment, Sempra Energy Consolidated [Member]
   
Goodwill [Line Items]    
Goodwill, Beginning Balance   $ 1,036
Foreign currency translation 21 [1]  
Acquisition of subsidiary 10  
Goodwill, Ending Balance 1,067  
Goodwill By Segment, Sempra South American Utilities [Member]
   
Goodwill [Line Items]    
Goodwill, Beginning Balance   949
Foreign currency translation 21 [1]  
Goodwill, Ending Balance 970  
Goodwill By Segment, Sempra Mexico [Member]
   
Goodwill [Line Items]    
Goodwill, Beginning Balance   25
Goodwill, Ending Balance 25  
Goodwill By Segment, Sempra Natural Gas [Member]
   
Goodwill [Line Items]    
Goodwill, Beginning Balance   62
Acquisition of subsidiary 10  
Goodwill, Ending Balance $ 72  
[1] We record the offset of this fluctuation to other comprehensive income.