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Income Taxes (Textual) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Line Items]
Loss Carryforwards	$ 1,216us-gaap_OperatingLossCarryforwards
Less valuation allowance	29	1,380
Unrecognized tax benefits that would impact the effective tax rate	503	653
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	96
Southern California Edison
Income Tax Disclosure [Line Items]
Loss Carryforwards	146
Less valuation allowance	0	0
Unrecognized tax benefits that would impact the effective tax rate	370	374
Disallowance of Repair Allowance Deduction
Income Tax Disclosure [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	(133)	(89)	(115)
Disallowance of Repair Allowance Deduction \| Southern California Edison
Income Tax Disclosure [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions			(231)
Tax Years 2007 to 2009 \| Disallowance of Repair Allowance Deduction \| Southern California Edison \| IRS Examination
Income Tax Disclosure [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	16
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment	76
Stock Compensation Plan
Income Tax Disclosure [Line Items]
Loss Carryforwards	42
Stock Compensation Plan \| Southern California Edison
Income Tax Disclosure [Line Items]
Loss Carryforwards	$ 22