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Discontinued Operations (Textual) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Homer City
Sep. 30, 2012
Homer City
Dec. 31, 2011
Homer City
Dec. 31, 2012
Pension Plans
Dec. 31, 2011
Pension Plans
Dec. 31, 2012
Edison Mission Energy
Dec. 31, 2012
Edison Mission Energy
Pension Plans
Dec. 31, 2012
Plan Support Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of days after bankruptcy filing for settlement transaction (days)               150 days    
Number of days for completion of settlement transaction agreement from petition date (days)               210 days    
Impairment and other charges     $ 89 $ 113 $ 1,030          
Other charges to write down assets held for sale to net realizable value, net of tax     53 68            
Investments in subsidiaries 2 2           0    
Retirement liabilities for EME employees 2,614 2,715       1,387 1,329   80  
Joint tax liability               183    
Receivables from EME 207             229    
Deconsolidated charges recorded in other comprehensive income           34 [1] 0 [1]   34  
Net receivable under plan support agreement                   46
Retirement liabilities assumed under plan support agreement                   104
Estimated loss under plan support agreement                   $ 150
[1] The retirement plan liabilities of EME have been deconsolidated as a result of the bankruptcy filing by EME, except for qualified pension plans that Edison International is jointly liable with EME under the Internal Revenue Code. See Note 17 for further information.