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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Regulatory Liabilities [Line Items] |  |  |  |  |
Current regulatory liabilities | $ 1,010 |  | $ 1,010 |  | $ 1,532
Long-term regulatory liabilities | 8,544 |  | 8,544 |  | 8,329
Deferred tax re-measurement | 0 | $ 0 | 69 | $ 0 |
Southern California Edison |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Current regulatory liabilities | 1,010 |  | 1,010 |  | 1,532
Long-term regulatory liabilities | 8,544 |  | 8,544 |  | 8,329
Total regulatory liabilities | 9,554 |  | 9,554 |  | 9,861
Deferred tax re-measurement | 0 | $ 0 | 69 | $ 0 |
Southern California Edison | Regulatory balancing accounts |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Current regulatory liabilities | 957 |  | 957 |  | 1,080
Long-term regulatory liabilities | 1,490 |  | 1,490 |  | 1,344
Southern California Edison | Energy derivatives |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Current regulatory liabilities | 41 |  | 41 |  | 158
Southern California Edison | 2018 GRC |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Current regulatory liabilities | 0 |  | 0 |  | 274
Southern California Edison | Other |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Current regulatory liabilities | 12 |  | 12 |  | 20
Long-term regulatory liabilities | 167 |  | 167 |  | 125
Southern California Edison | Cost of removal |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Long-term regulatory liabilities | 2,721 |  | 2,721 |  | 2,769
Southern California Edison | Re-measurement of deferred taxes |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Long-term regulatory liabilities | 2,474 |  | 2,474 |  | 2,776
Southern California Edison | Recoveries in excess of ARO liabilities |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Long-term regulatory liabilities | 1,494 |  | 1,494 |  | 1,130
Southern California Edison | Other postretirement benefits |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Long-term regulatory liabilities | $ 198 |  | $ 198 |  | $ 185

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