Income Taxes (Textual) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Line Items]
Operating Loss Carryforwards	$ 1,300
Income tax expense from discontinued operations	25
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	205
Penalty for understatement of tax liability (as a percent)	40.00%
Southern California Edison
Income Tax Disclosure [Line Items]
Estimated federal tax payment as a result of the proposed adjustment to adjust repair allowance deduction	74
Operating Loss Carryforwards	177
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	99
General Business Tax Credit Carryforward [Member] | IRS Examination
Income Tax Disclosure [Line Items]
Tax Credit Carryforward, Amount	311
General Business Tax Credit Carryforward [Member] | Southern California Edison | IRS Examination
Income Tax Disclosure [Line Items]
Tax Credit Carryforward, Amount	44
2029-2032 | General Business Tax Credit Carryforward [Member] | IRS Examination
Income Tax Disclosure [Line Items]
Tax Credit Carryforwards, Subject to Expiration	289
2015-2024
Income Tax Disclosure [Line Items]
Operating Loss Carryforwards, Subject to Expiration	32
2030-2032 | General Business Tax Credit Carryforward [Member] | Southern California Edison | IRS Examination
Income Tax Disclosure [Line Items]
Tax Credit Carryforwards, Subject to Expiration	30
2015-2016 | Southern California Edison
Income Tax Disclosure [Line Items]
Operating Loss Carryforwards, Subject to Expiration	$ 18