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Regulatory Assets and Liabilities (Schedule of Net Regulatory Balancing and Memorandum Accounts) (Details) - Southern California Edison - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Nov. 30, 2018 | Sep. 30, 2019
Regulatory Assets and Liabilities |  |  |
Asset (liability) |  |  | $ 107
Wildfire-specific insurance coverage | $ 1,000 | $ 300 |
Regulatory balancing accounts | Energy resource recovery account |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | 815 |  | 205
Regulatory balancing accounts | Portfolio allocation balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | 0 |  | 341
Regulatory balancing accounts | New system generation balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | (74) |  | 102
Refunds of excess revenue | Net regulatory balancing accounts |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | (1,250) |  | (1,074)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | (1,200) |  | (1,260)
Refunds of excess revenue | Tax accounting memorandum account and pole loading balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | 28 |  | (18)
Refunds of excess revenue | Base revenue requirement balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | (628) |  | (595)
Refunds of excess revenue | DOE litigation memorandum account |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | (69) |  | (70)
Refunds of excess revenue | Greenhouse gas auction revenue and low carbon fuel standard revenue |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | (81) |  | (222)
Refunds of excess revenue | FERC balancing accounts |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | (180) |  | (96)
Refunds of excess revenue | Wildfire-related memorandum accounts |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | 272 |  | 506
Refunds of excess revenue | Other |  |  |
Regulatory Assets and Liabilities |  |  |
Asset (liability) | $ (133) |  | $ 33

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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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