Compensation and Benefit Plans (Textual) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 67
Estimated future contributions in remainder of year	2
PBOP Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	9
Estimated future contributions in remainder of year	3
Southern California Edison | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	52
Estimated future contributions in remainder of year	$ 1