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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 1,341 | $ 1,121
Long-term regulatory liabilities | 8,659 | 8,614
Southern California Edison |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1,341 | 1,121
Long-term regulatory liabilities | 8,659 | 8,614
Total regulatory liabilities | 10,000 | 9,735
Southern California Edison | Regulatory balancing accounts |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1,004 | 1,009
Long-term regulatory liabilities | 1,539 | 1,316
Southern California Edison | Energy derivatives |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 50 | 74
Southern California Edison | San Onofre |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 96 | 5
Long-term regulatory liabilities | 26 | 26
Southern California Edison | Other |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 191 | 33
Long-term regulatory liabilities | 37 | 64
Southern California Edison | Costs of removal |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,804 | 2,741
Southern California Edison | Re-measurement of deferred taxes |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,815 | 2,892
Southern California Edison | Recoveries in excess of ARO liabilities |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | $ 1,438 | $ 1,575

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