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Income Taxes (Operating Loss and Tax Carryforward) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Tax Credit Carryforward [Line Items] |  |  |  |  |
Unrecognized tax benefits |  | $ 529 | $ 576 | $ 815 | $ 812
Loss Carryforwards, Expiring 2021 to 2034 |  | 1,136 |  |  |
Loss Carryforwards, No expiration date |  | 0 |  |  |
Loss Carryforwards | [1] | 1,136 |  |  |
Credit Carryforward, Expiring 2021 to 2034 |  | 409 |  |  |
Credit Carryforward, No expiration date |  | 54 |  |  |
Credit Carryforwards | [1] | 463 |  |  |
Loss and credit carryforwards |  | 1,388 | 1,657 | 2,200 |
Southern California Edison |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Unrecognized tax benefits |  | 353 | 441 | $ 532 | $ 571
Loss Carryforwards, Expiring 2021 to 2034 |  | 39 |  |  |
Loss Carryforwards | [1] | 39 |  |  |
Credit Carryforward, Expiring 2021 to 2034 |  | 22 |  |  |
Credit Carryforward, No expiration date |  | 39 |  |  |
Credit Carryforwards | [1] | 61 |  |  |
Loss and credit carryforwards |  | 0 | $ 205 |  |
Capistrano Wind [Member] |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Loss and credit carryforwards |  | 210 |  |  |
Loss And Credit Carryforwards [Member] |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Unrecognized tax benefits |  | 211 |  |  |
Loss And Credit Carryforwards [Member] | Southern California Edison |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Unrecognized tax benefits |  | $ 100 |  |  |
[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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