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Regulatory Assets and Liabilities (Regulatory Balancing Accounts) (Details) - SCE - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Regulatory balancing accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | $ (89) | $ (23)
Regulatory balancing accounts | Portfolio allocation balancing account |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 497 | 537
Regulatory balancing accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (10) | 85
Revenue subject to refund | Significant components |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 1,388 | (365)
Revenue subject to refund | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (1,130) | (1,244)
Revenue subject to refund | Base revenue requirement balancing account |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 622 | (328)
Revenue subject to refund | Greenhouse gas auction revenue and low carbon fuel standard revenue |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (125) | (196)
Revenue subject to refund | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 12 | (127)
Revenue subject to refund | Wildfire and drought restoration account |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 361 | 120
Revenue subject to refund | Wildfire expense memorandum account |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 1,104 | 748
Revenue subject to refund | COVID-19-related memorandum accounts |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 176 | 0
Revenue subject to refund | Other |  |
Regulatory Assets and Liabilities |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | $ (30) | $ 63

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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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