Compensation and Benefit Plans (Textual) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 23
Estimated future contributions in remainder of year	43
PBOP Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	6
Estimated future contributions in remainder of year	6
Southern California Edison | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	14
Estimated future contributions in remainder of year	$ 36