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Income Taxes (Textual) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Line Items]      
Income tax benefit $ (88) $ 0 $ 466
Unrecognized tax benefits that would impact the effective tax rate 192    
California Franchise Tax Board | Tax Years 1994 to 2006      
Income Tax Disclosure [Line Items]      
Refund of tax and interest   65  
Capistrano Wind | Affiliated Entity | Tax Allocation Agreement      
Income Tax Disclosure [Line Items]      
Due to affiliate under tax allocation agreements 212    
SCE      
Income Tax Disclosure [Line Items]      
Income tax benefit (88) $ 0 $ 33
Unrecognized tax benefits that would impact the effective tax rate $ 104