Income Taxes (Tax Rate Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Effective Tax Rate
Income from continuing operations before income taxes	$ 205	$ 384
Provision for income tax at federal statutory rate of 35%	71	134
State tax, net of federal benefit	1	3
Property-related	(51)	(41)
Change related to uncertain tax positions	7	7
San Onofre settlement	(40)	0
Other	(7)	(5)
Total income tax expense (benefit) from continuing operations	(19)	98
Federal statutory rate (as a percent)	35.00%	35.00%
Effective tax rate	(9.30%)	25.50%
Southern California Edison
Effective Tax Rate
Income from continuing operations before income taxes	222	395
Provision for income tax at federal statutory rate of 35%	78	138
State tax, net of federal benefit	1	14
Property-related	(51)	(42)
Change related to uncertain tax positions	7	7
San Onofre settlement	(40)	0
Other	(7)	(5)
Total income tax expense (benefit) from continuing operations	$ (12)	$ 112
Federal statutory rate (as a percent)	35.00%	35.00%
Effective tax rate	(5.40%)	28.40%