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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 1,532 | $ 1,121
Long-term regulatory liabilities | 8,329 | 8,614
SCE |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1,532 | 1,121
Long-term regulatory liabilities | 8,329 | 8,614
Total regulatory liabilities | 9,861 | 9,735
SCE | Regulatory balancing accounts |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1,080 | 1,009
Long-term regulatory liabilities | 1,344 | 1,316
SCE | Energy derivatives |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 158 | 74
SCE | Other |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 294 | 38
Long-term regulatory liabilities | 125 | 64
SCE | Costs of removal |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,769 | 2,741
SCE | Re-measurement of deferred taxes |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,776 | 2,892
SCE | Recoveries in excess of ARO liabilities |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 1,130 | 1,575
SCE | Other postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | $ 185 | $ 26

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