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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 1,599 | $ 1,121
Long-term regulatory liabilities | 8,463 | 8,614
Southern California Edison |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1,599 | 1,121
Long-term regulatory liabilities | 8,463 | 8,614
Total regulatory liabilities | 10,062 | 9,735
Southern California Edison | Regulatory balancing accounts |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1,273 | 1,009
Long-term regulatory liabilities | 1,333 | 1,316
Southern California Edison | Energy derivatives |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 41 | 74
Southern California Edison | Other |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 285 | 38
Long-term regulatory liabilities | 36 | 64
Southern California Edison | Costs of removal |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,802 | 2,741
Southern California Edison | Re-measurement of deferred taxes |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,796 | 2,892
Southern California Edison | Recoveries in excess of ARO liabilities |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 1,470 | 1,575
Southern California Edison | Other postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | $ 26 | $ 26

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