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Income Taxes (Textual) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2015 Tax Years 2003 to 2006 IRS Examination Scenario, Forecast | Jun. 30, 2014 Southern California Edison | Jun. 30, 2014 Southern California Edison Tax Years 2003 to 2006 IRS Examination Proposed Adjustment to Taxable Gain | Jun. 30, 2014 Southern California Edison Tax Years 2003 to 2006 IRS Examination Disallowance of Repair Allowance Deduction | Jun. 30, 2014 Southern California Edison Tax Years 2007 to 2009 IRS Examination Disallowance of Repair Allowance Deduction
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Reduction to revenue from repair deductions, before tax |  |  | $ 231 |  |  |
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment |  |  |  | 210 | 102 | 75
Deposit against IRS tax dispute adjustment | 189 |  |  |  |  |
Estimated tax benefits |  | $ 50 |  |  |  |

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