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Summary of Significant Accounting Policies (Revenue Recognition) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020
Public Utilities, General Disclosures [Line Items] |  |
Requested revenue requirement year one | $ 5,534 |
Decrease in revenue requirement | 106 |
Requested |  |
Public Utilities, General Disclosures [Line Items] |  |
Rate period |  | 3 years
Requested revenue requirement year one | 5,965 |
Requested revenue requirement year two | $ 6,468 |

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