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Compensation and Benefit Plans (Textual) (Details) $ in Millions | 9 Months Ended
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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

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