Income Taxes (Textual) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2019
Income Tax Disclosure [Line Items]
Unrecognized tax benefits that would impact the effective tax rate	$ 446
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	218	$ 212
SCE
Income Tax Disclosure [Line Items]
Unrecognized tax benefits that would impact the effective tax rate	$ 87