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