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Summary of Significant Accounting Policies (Revenue) (Details) - SCE - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2021
Public Utilities, General Disclosures [Line Items] |  |  |
Asset retirement obligation increase (decrease) |  | $ (131) |
Approved regulatory increase (decrease) | $ 505 |  |
2021 General Rate Case |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved rate amount |  |  | $ 6,900
Approved regulatory increase (decrease) |  | $ 404 | $ 1,000

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