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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 972 | $ 1,532
Long-term regulatory liabilities | 8,385 | 8,329
SCE |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 972 | 1,532
Long-term regulatory liabilities | 8,385 | 8,329
Total regulatory liabilities | 9,357 | 9,861
SCE | Regulatory balancing and memorandum accounts |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 883 | 1,080
Long-term regulatory liabilities | 1,261 | 1,344
SCE | Energy derivatives |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 80 | 158
SCE | 2018 GRC |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 274
SCE | Other |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 9 | 20
Long-term regulatory liabilities | 41 | 125
SCE | Costs of removal |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,674 | 2,769
SCE | Re-measurement of deferred taxes |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,424 | 2,776
SCE | Recoveries in excess of ARO liabilities |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 1,569 | 1,130
SCE | Other postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | $ 416 | $ 185

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