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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 |  |

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