Compensation and Benefit Plans (Textual) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 100
Estimated future contributions in remainder of year	15
PBOP Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	16
Estimated future contributions in remainder of year	5
Southern California Edison | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	64
Estimated future contributions in remainder of year	$ 1