Compensation and Benefit Plans (Textual) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Pension Plans
Pension and Other Postretirement Benefits
Employer contributions	$ 6
Estimated future contributions in remainder of 2014	202
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Employer contributions	4
Estimated future contributions in remainder of 2014	11
Southern California Edison | Pension Plans
Pension and Other Postretirement Benefits
Estimated future contributions in remainder of 2014	185
Employee severance | Southern California Edison
Pension and Other Postretirement Benefits
Estimated cash severance payments	$ 213