Income Taxes (Textual) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Line Items]
Reduction to revenue from repair deductions, before tax	$ 231
Tax Years 2003 to 2006 | Proposed Adjustment to Taxable Gain | 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	208
Tax Years 2003 to 2006 | Disallowance of Repair Allowance Deduction | 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	101
Tax Years 2007 to 2009 | Disallowance of Repair Allowance Deduction | 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	$ 75