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Summary of Significant Accounting Policies (New Accounting Guidance) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 | Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Cumulative effect of accounting changes |  |  |  |  | $ 5 |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit income - non-service cost components |  |  |  | $ 8 |  | $ 15
ASU 2014-09 | Difference between revenue guidance in effect before and after topic 606 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Cumulative effect of accounting changes |  | $ 5 |  |  |  |
Cumulative effect of accounting changes, before tax |  | 7 |  |  |  |
ASU 2016-07 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Cumulative effect of accounting changes |  | 5 |  |  |  |
Cumulative effect of accounting changes, before tax |  | $ 8 |  |  |  |
ASU 2018-02 | Forecast |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Reclassification of stranded tax effects | $ 10 |  |  |  |  |
Southern California Edison |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Cumulative effect of accounting changes |  |  |  |  | 0 |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit income - non-service cost components |  |  | $ 26 | $ 9 | $ 79 | $ 27
Southern California Edison | ASU 2018-02 | Forecast |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Reclassification of stranded tax effects | $ 5 |  |  |  |  |

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