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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 801 | $ 972
Long-term regulatory liabilities | 8,089 | 8,385
Southern California Edison |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 801 | 972
Long-term regulatory liabilities | 8,089 | 8,385
Total regulatory liabilities | 8,890 | 9,357
Southern California Edison | Regulatory balancing and memorandum accounts |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 744 | 883
Long-term regulatory liabilities | 1,047 | 1,261
Southern California Edison | Energy derivatives |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 45 | 80
Southern California Edison | Other |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 12 | 9
Long-term regulatory liabilities | 35 | 41
Southern California Edison | Cost of removal |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,585 | 2,674
Southern California Edison | Re-measurement of deferred taxes |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,318 | 2,424
Southern California Edison | Recoveries in excess of ARO liabilities |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 1,677 | 1,569
Southern California Edison | Other postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | $ 427 | $ 416

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