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Income Taxes (Textual) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Less valuation allowance |  |  |  | $ 24 |  |
Valuation allowance for assets |  |  |  | 8 |  |
Unrecognized tax benefits that would impact the effective tax rate |  |  | $ 440 | 347 | $ 440 |
IRS Examination | Tax Years 2010 to 2012 |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Federal tax liability |  |  |  |  | (94) |
Disallowance of Repair Allowance Deduction |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Federal tax liability |  |  |  |  |  | $ (133)
Base rate offset |  |  | 324 |  | $ 324 |
Rate base offset amortization period (years) |  |  |  |  | 27 years |
Capistrano Wind | Affiliated Entity | Tax Allocation Agreement |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Due to affiliate under tax allocation agreements |  |  | 210 | 242 | $ 210 |
SCE |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Granted BRRBA reduction | $ 234 |  |  |  |  |
Refund |  | $ 133 |  |  |  |
After tax refund |  | $ 79 |  |  |  |
Unrecognized tax benefits that would impact the effective tax rate |  |  | 256 | $ 243 | 256 |
SCE | IRS Examination | Tax Years 2010 to 2012 |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Federal tax liability |  |  |  |  | (100) |
SCE | Disallowance of Repair Allowance Deduction |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Federal tax liability |  |  | 382 |  | 382 |
Retained Earnings | Accounting standards update to simplify the accounting for share-based payments | Early adoption using modified retrospective approach |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  |  | 42 |  | 42 |
Retained Earnings | Accounting standards update to simplify the accounting for share-based payments | Early adoption using modified retrospective approach | SCE |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  |  | $ 6 |  | $ 6 |

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