Compensation and Benefit Plans (Textual) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Pension Plans
Pension and Other Postretirement Benefits
Employer contributions	$ 5
Estimated future contributions in remainder of year	115
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Employer contributions	7
Estimated future contributions in remainder of year	26
Southern California Edison | Pension Plans
Pension and Other Postretirement Benefits
Employer contributions	1
Estimated future contributions in remainder of year	$ 94