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Income Taxes (Textual) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Line Items] |  |  |  |  |
Loss Carryforwards | [1] | $ 1,136 | $ 1,136 |  |
Less valuation allowance |  | 32 | $ 32 | $ 29 |
Rate Base Offset Amortization Period |  |  | 27 years |  |
Unrecognized tax benefits that would impact the effective tax rate |  | 440 | $ 440 | 503 |
Southern California Edison |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Loss Carryforwards | [1] | 39 | 39 |  |
Less valuation allowance |  | 0 | 0 | 0 |
Unrecognized tax benefits that would impact the effective tax rate |  | 256 | 256 | 370 |
Disallowance of Repair Allowance Deduction |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal tax liability |  |  |  | $ (133) | $ (89)
Disallowance of Repair Allowance Deduction | Southern California Edison |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal tax liability |  | (382) |  |  |
Deferred Tax Rate Base Offset |  | 324 | 324 |  |
Tax Years 2007 to 2009 | Disallowance of Repair Allowance Deduction | Southern California Edison | IRS Examination |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal tax liability |  |  | 64 |  |
Tax Years 2010 to 2012, Federal | IRS Examination |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal tax liability |  |  | 94 |  |
Tax Years 2010 to 2012, Federal | Disallowance of Repair Allowance Deduction | Southern California Edison | IRS Examination |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal tax liability |  |  | 9 |  |
Tax Years 2010 to 2012, State | IRS Examination |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal tax liability |  |  | 100 |  |
Stock Compensation Plan |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Loss Carryforwards |  | 42 | 42 |  |
Stock Compensation Plan | Southern California Edison |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Loss Carryforwards |  | $ 6 | $ 6 |  |
[1] | Deferred tax assets for net operating loss and tax credit carryforwards are reduced by unrecognized tax benefits of $211 million and $100 million for Edison International and SCE, respectively.

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