Income Taxes (Interest and Penalties Related to Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Line Items]
Accrued interest and penalties	$ 406	$ 278
Net after-tax interest and penalties tax benefit (expense)	(3)	(10)	(8)
Southern California Edison
Income Tax Disclosure [Line Items]
Accrued interest and penalties	88	87
Net after-tax interest and penalties tax benefit (expense)	$ 2	$ (11)	$ (8)