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Income Taxes (Textual) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Southern California Edison      
Income Tax Disclosure [Line Items]      
Reduction in base revenue requirement balancing account $ 234    
IRS Examination | Tax Years 2010 to 2012      
Income Tax Disclosure [Line Items]      
Income tax benefits     $ 94
IRS Examination | Southern California Edison | Tax Years 2012 to 2014      
Income Tax Disclosure [Line Items]      
Income tax benefits, pre tax   $ 133  
Income tax benefits   $ 79  
IRS Examination | Southern California Edison | Tax Years 2010 to 2012      
Income Tax Disclosure [Line Items]      
Income tax benefits     $ 100