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Regulatory Assets and Liabilities (Schedule of Net Regulatory Balancing and Memorandum Accounts) (Details) - Southern California Edison - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Regulatory balancing and memorandum accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ (120) | $ (23)
Regulatory balancing and memorandum accounts | Portfolio allocation balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 599 | 537
Regulatory balancing and memorandum accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 75 | 85
Refunds of excess revenue | Net regulatory balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 17 | (365)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,330) | (1,235)
Refunds of excess revenue | Tax accounting memorandum account and pole loading balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (7) | 17
Refunds of excess revenue | Base revenue requirement balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 101 | (328)
Refunds of excess revenue | DOE litigation memorandum account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (35) | (35)
Refunds of excess revenue | Greenhouse gas auction revenue and low carbon fuel standard revenue |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (234) | (196)
Refunds of excess revenue | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (58) | (127)
Refunds of excess revenue | Wildfire-related memorandum accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 947 | 868
Refunds of excess revenue | Other |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ 79 | $ 72

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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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