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Summary of Significant Accounting Policies (Revenue Recognition) (Details) - SCE - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jul. 31, 2019 | Mar. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested increase (decrease) in revenue requirement | $ 214 |  | $ 505 |
Approved regulatory increase (decrease) in revenue |  | $ 505 |  |
2021 General Rate Case |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested test year revenue requirement |  |  |  | $ 7,600
Requested increase (decrease) in revenue requirement |  |  |  | $ 1,300

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