Income Taxes (Textual) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Line Items]
Tax credit carryforwards	$ 399
Operating loss carryforwards	1,900
Deferred tax assets, loss and credit carryforwards	2,228	1,515
Earnings benefit from change in prior year tax deductions	231
Unrecognized tax benefits that would impact the effective tax rate	653	622
Federal statutory income tax rate (percent)	35.00%	35.00%	35.00%
Tax Credit Carryforward, expire between 2029 - 2033
Income Tax Disclosure [Line Items]
Tax credit carryforwards	376
Net Operating Loss, expire between 2015 - 2025
Income Tax Disclosure [Line Items]
Operating loss carryforwards	36
Southern California Edison
Income Tax Disclosure [Line Items]
Tax credit carryforwards	55
Operating loss carryforwards	371
Deferred tax assets, loss and credit carryforwards	427	125
Unrecognized tax benefits that would impact the effective tax rate	374	388
Southern California Edison | Tax Credit Carryforward, expire between 2030 - 2033
Income Tax Disclosure [Line Items]
Tax credit carryforwards	41
Southern California Edison | Net Operating Loss, expire between 2015 -2017
Income Tax Disclosure [Line Items]
Operating loss carryforwards	18
Edison Mission Energy
Income Tax Disclosure [Line Items]
Deferred tax assets, loss and credit carryforwards	1,600
Deferred Tax Assets No Longer Available Due to Deconsolidation	220
Tax basis in stock	544
Tax Years 2003 to 2006 [Member] | Proposed Adjustment to Taxable Gain [Member] | Southern California Edison | IRS Examination
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	206
Tax Years 2003 to 2006 [Member] | Disallowance of Repair Allowance Deduction [Member] | Southern California Edison | IRS Examination
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	100
Tax Years 2007 to 2009 [Member] | Disallowance of Repair Allowance Deduction [Member] | Southern California Edison | IRS Examination
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	$ 74