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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
S D G E Segment [Member]
   
Schedule Of Commodity Derivative Volumes [Line Items]    
Commodity derivative volumes, natural gas (in millions of million British thermal units) $ 29 [1] $ 35 [1]
Commodity derivative volumes, congestion revenue rights (in millions of megawatt hours) 14 [2] 19 [2]
Sempra Mexico Segment [Member]
   
Schedule Of Commodity Derivative Volumes [Line Items]    
Commodity derivative volumes, natural gas (in millions of million British thermal units) 1 [1] 1 [1]
Sempra Natural Gas Segment [Member]
   
Schedule Of Commodity Derivative Volumes [Line Items]    
Commodity derivative volumes, natural gas (in millions of million British thermal units) 21 [1] 20 [1]
Commodity derivative volumes, electric power (in millions of megawatt hours) $ 4 [2] $ 5 [2]
[1] Million British thermal units
[2] Megawatt hours