Compensation and Benefit Plans (Textual) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Pension Plans
Pension and Other Postretirement Benefits
Employer contributions	$ 54
Estimated future contributions in remainder of 2013	153
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Employer contributions	5
Estimated future contributions in remainder of 2013	25
Southern California Edison | Pension Plans
Pension and Other Postretirement Benefits
Employer contributions	45
Estimated future contributions in remainder of 2013	137
Southern California Edison | Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Employer contributions	5
Estimated future contributions in remainder of 2013	$ 25