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Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]    
Accumulated depreciation $ (7,424) $ (6,894)
Total utility property, plant and equipment 30,200 27,569
Southern California Edison
   
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]    
Transmission 7,059 6,109
Distribution 16,872 15,938
Generation 4,455 4,063
General plant and other 4,358 3,951
Accumulated depreciation (7,424) (6,894)
Total utility property, plant and equipment, Gross 25,320 23,167
Construction work in progress 4,271 3,922
Nuclear fuel, at amortized cost 609 480
Total utility property, plant and equipment 30,200 27,569
Southern California Edison | Eldorado
   
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]    
Construction work in progress 11  
Nuclear fuel, at amortized cost 0  
Plant in Service 73  
Accumulated Depreciation 14  
Net Book Value 70  
Ownership Interest 60.00%  
Southern California Edison | Pacific Intertie
   
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]    
Construction work in progress 6  
Nuclear fuel, at amortized cost 0  
Plant in Service 189  
Accumulated Depreciation 70  
Net Book Value 125  
Ownership Interest 50.00%  
Southern California Edison | Four Corners Unit 4 And 5 (coal)
   
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]    
Construction work in progress 17  
Nuclear fuel, at amortized cost 0  
Plant in Service 589  
Accumulated Depreciation 545  
Net Book Value 61  
Ownership Interest 48.00%  
Southern California Edison | Mohave (coal)
   
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]    
Construction work in progress 32  
Nuclear fuel, at amortized cost 0  
Plant in Service 327  
Accumulated Depreciation 292  
Net Book Value 67  
Ownership Interest 56.00%  
Southern California Edison | Palo Verde (nuclear)
   
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]    
Construction work in progress 67  
Nuclear fuel, at amortized cost 142  
Plant in Service 1,819  
Accumulated Depreciation 1,480  
Net Book Value 548  
Ownership Interest 16.00%  
Southern California Edison | San Onofre (nuclear)
   
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]    
Construction work in progress 223  
Nuclear fuel, at amortized cost 467  
Plant in Service 5,300  
Accumulated Depreciation 4,017  
Net Book Value 1,973  
Ownership Interest 78.21%  
Southern California Edison | Aggregate Jointly Owned Utility Projects
   
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]    
Construction work in progress 356  
Nuclear fuel, at amortized cost 609  
Plant in Service 8,297  
Accumulated Depreciation 6,418  
Net Book Value $ 2,844