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Variable Interest Entities (Details) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
SCE Trust I
Sep. 30, 2012
SCE Trust I
May 31, 2012
SCE Trust I
Trust Securities
Sep. 30, 2012
SCE Trust I
Trust Securities
Jun. 30, 2012
SCE Trust I
Series F
Sep. 30, 2012
SCE Trust I
Series F
May 31, 2012
SCE Trust I
Series F
Sep. 30, 2012
Variable Interest Entity, Not Primary Beneficiary
SCE Power Purchase Contracts
agreements
contracts
MW
Sep. 30, 2011
Variable Interest Entity, Not Primary Beneficiary
SCE Power Purchase Contracts
Sep. 30, 2012
Variable Interest Entity, Not Primary Beneficiary
SCE Power Purchase Contracts
agreements
contracts
MW
Sep. 30, 2011
Variable Interest Entity, Not Primary Beneficiary
SCE Power Purchase Contracts
Details of projects or entities                          
Number of projects                   17   17  
Power purchase agreement with tolling agreement (in agreements)                   7   7  
Power purchase agreement with qualified facilities (in contracts)                   10   10  
Power generating capacity for majority interest (in megawatts)                   3,900   3,900  
Payments to unconsolidated VIEs, power purchase contracts                   $ 158,000,000 $ 178,000,000 $ 292,000,000 $ 347,000,000
Unconsolidated Trust                          
Trust securities, percentage rate         5.625%   5.625%            
Trust securities, liquidation preference (in dollars per share)         $ 25   $ 2,500   $ 2,500        
Trust securities, liquidation preference         475,000,000                
Common stock 2,168,000,000 2,168,000,000 10,000 10,000 10,000                
Common stock, percentage issued to Southern California Edison         100.00%                
Preferred and preference stock 1,795,000,000 1,045,000,000       475,000,000   475,000,000 475,000,000        
Dividend income and accrued dividend payments     $ 7,000,000 $ 10,000,000