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Regulatory Assets and Liabilities (Schedule of Net Regulatory Balancing and Memorandum Accounts) (Details) - Southern California Edison - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Regulatory balancing and memorandum accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ (264) | $ (23)
Regulatory balancing and memorandum accounts | Portfolio allocation balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 684 | 537
Regulatory balancing and memorandum accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 25 | 85
Refunds of excess revenue | Net regulatory balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 657 | (365)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,221) | (1,244)
Refunds of excess revenue | Base revenue requirement balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 420 | (328)
Refunds of excess revenue | Greenhouse gas auction revenue and low carbon fuel standard revenue |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (104) | (196)
Refunds of excess revenue | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (33) | (127)
Refunds of excess revenue | Wildfire-related memorandum accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 1,061 | 868
Refunds of excess revenue | COVID 19-related memorandum accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 107 | 0
Refunds of excess revenue | Other |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ (18) | $ 63

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