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Related-Party Transactions (Details) - Southern California Edison - Subsidiary of Common Parent - Wildfire Liability Insurance - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Wildfire insurance premiums |  |  | $ 260 |  |
Long-term insurance receivable due from affiliate | $ 1,000 |  | 1,000 |  | $ 1,000
Prepaid insurance | 42 |  | 42 |  | 13
Current payables due to affiliate | 0 |  | 0 |  | $ 4
Wildfire insurance expense | $ 51 | $ 35 | $ 123 | $ 106 |

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