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Summary of Significant Accounting Policies (Regulatory Proceedings) (Details) - Southern California Edison - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019
CPUC | 2018 GRC |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Impact of decision non-core impairment of utility core earnings, net of tax |  |  |  | $ 66 | $ 65 | $ 131
Reduction in revenue |  |  |  |  |  | $ 265
Reduction in authorized revenue |  |  |  |  | $ 289 |
Increase in approved revenue |  |  |  | $ 24 |  |
Impact of decision non-core impairment of utility property, plant and equipment |  |  | $ 170 |  |  |
Impact of decision non-core impairment of utility property, plant and equipment, net of tax |  |  | $ 123 |  |  |
FERC | 2019 Formula Rate Settlement |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Approved ROE |  | 10.30% |  |  |  |
Alternative ROE |  | 47.50% |  |  |  |
Settlement period base ROE | 11.97% |  |  |  |  |

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