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Compensation and Benefit Plans (Textual) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Employer contributions | $ 18
Estimated future contributions in remainder of year | 48
PBOP Plan |
Defined Benefit Plan Disclosure [Line Items] |
Employer contributions | 3
Estimated future contributions in remainder of year | 9
Southern California Edison | Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Employer contributions | 13
Estimated future contributions in remainder of year | $ 37

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