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Summary of Significant Accounting Policies (New Accounting Guidance) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings |  | $ 9,286 |  | $ 9,286 |  | $ 9,188
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit income - non-service cost components |  |  | $ (1) |  | $ 7 |
Southern California Edison |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings |  | 9,878 |  | 9,878 |  | $ 9,607
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit income - non-service cost components |  | $ 27 | $ 9 | $ 53 | $ 18 |
ASU 2014-09 | Difference between revenue guidance in effect before and after topic 606 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings | $ 5 |  |  |  |  |
Retained earnings, before tax | 7 |  |  |  |  |
ASU 2016-07 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings | 5 |  |  |  |  |
Retained earnings, before tax | $ 8 |  |  |  |  |

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