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Income Taxes (Textual) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016
Income Tax Disclosure [Line Items] |  |  |  |
Accumulated deferred income net income tax liabilities |  | $ 4,500 |  |
Re-measurement of federal net operating loss carryforwards |  | 466 |  |
Unrecognized tax benefits that would impact the effective tax rate |  | 308 | $ 197 | $ 347
Tax Years 2007 To 2012 |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Expected refund |  | 7 |  |
Tax Years 1994 to 2006 |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Expected refund |  |  | 103 |
California Franchise Tax Board | Tax Years 1994 to 2006 |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Expected refund |  |  | 65 |
Capistrano Wind | Affiliated Entity | Tax Allocation Agreement |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Due to affiliate under tax allocation agreements |  | 199 | 212 |
SCE |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Accumulated deferred income net income tax liabilities |  | 5,000 |  |
Changes to earnings charge |  | 33 |  |
Unrecognized tax benefits that would impact the effective tax rate |  | $ 167 | 95 | $ 243
SCE | Tax Years 1994 to 2006 |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Expected refund |  |  | 70 |
EME | Tax Years 1994 to 2006 |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Expected refund |  |  | $ 34 |
Forecast | SCE |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Changes to earnings charge | $ (70) |  |  |

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