Income Taxes (Textual) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Line Items]
Amount of unrecognized tax benefits expected to decrease by the end of the year	$ 123		$ 123
Disallowance of Repair Allowance Deduction
Income Tax Disclosure [Line Items]
Federal tax liability	8	$ 24	15	$ 49
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		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			79
Federal tax liability			$ 16
Southern California Edison | Tax Years 2010 to 2012 | IRS Examination | Disallowance of Repair Allowance Deduction
Income Tax Disclosure [Line Items]
Federal tax liability	$ 100