Compensation and Benefit Plans (Textual) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Pension Plans
Pension and Other Postretirement Benefits
Employer contributions	$ 4
Estimated future contributions in remainder of year	117
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Employer contributions	15
Estimated future contributions in remainder of year	44
Southern California Edison | Pension Plans
Pension and Other Postretirement Benefits
Employer contributions	1
Estimated future contributions in remainder of year	91
Employee severance | Southern California Edison
Pension and Other Postretirement Benefits
Estimated cash severance payments	$ 215