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Summary of Significant Accounting Policies (New Accounting Guidance) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Restricted cash |  | $ 41 | $ 18
Service cost |  | 169 |
Non-service costs |  | 72 |
SCE |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Restricted cash |  | 1 |
Service cost |  | 164 |
Non-service costs |  | $ 84 |
SCE | Sales |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Sales from tariff offerings, percentage of total operating revenues | 95.00% |  |

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