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Income Taxes (Textual) (Details) - IRS Examination - Disallowance of Repair Allowance Deduction - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Jun. 30, 2015
Tax Years 2010 to 2012 |  |
Income Tax Disclosure [Line Items] |  |
Tax liability |  | $ 94
Southern California Edison | Tax Years 2007 to 2009 |  |
Income Tax Disclosure [Line Items] |  |
Tax liability | $ 64 |
Southern California Edison | Tax Years 2010 to 2012 |  |
Income Tax Disclosure [Line Items] |  |
Tax liability |  | $ 100
Southern California Edison | Tax Years 2010 to 2012, Federal [Member] |  |
Income Tax Disclosure [Line Items] |  |
Tax liability | $ (9) |

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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28511-109314 + Details
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