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Summary of Significant Accounting Policies (Deferred Financing Costs) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Regulatory assets $ 6,422 $ 5,466  
Unamortized debt issuance expense   63  
Southern California Edison
     
Regulatory assets 6,422 5,815  
Unamortized debt issuance expense 67 60  
Amortization of deferred financing costs 29 33 30
Southern California Edison | Loss on Reacquired Debt
     
Regulatory assets 228 249  
Edison International
     
Unamortized debt issuance expense 73    
Amortization of deferred financing costs $ 30 $ 34 $ 30