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Discontinued Operations (Textual) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2014
installment
Apr. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Cash portion of settlement payment                     $ 176 $ 225 $ 0
Income (loss) from discontinued operations, net of tax     $ (8) $ 43 $ 0 $ 0 $ 39 $ (16) $ 184 $ (22) 35 185 36
Loss before income taxes                     15 (525)  
Edison International                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Income (loss) from discontinued operations, net of tax                     35 185 36
Loss before income taxes                       $ 525  
Edison Mission Energy                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Cash portion of settlement payment   $ 225                      
Number of Installments | installment 2                        
Installment one, tax attribute settlement       $ 204                  
Installment two, tax attribute settlement     $ 214               $ 214    
Homer City                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Impairment and other charges, after tax                         $ 36