Income Taxes (Textual) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2015
Income Tax Disclosure [Line Items]
Amount of unrecognized tax benefits expected to decrease by the end of the year		$ 124
Tax Years 2010 to 2012 | IRS Examination | Disallowance of Repair Allowance Deduction
Income Tax Disclosure [Line Items]
Federal tax liability	$ 94
Amount of unrecognized tax benefits expected to decrease by the end of the year		99
Southern California Edison
Income Tax Disclosure [Line Items]
Revisions to taxes		18
Southern California Edison | Tax Years 2007 to 2009 | IRS Examination | Disallowance of Repair Allowance Deduction
Income Tax Disclosure [Line Items]
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment		80
Federal tax liability		$ 17
Southern California Edison | Tax Years 2010 to 2012 | IRS Examination | Disallowance of Repair Allowance Deduction
Income Tax Disclosure [Line Items]
Federal tax liability	$ 100