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Related-Party Transactions (Details) - Southern California Edison - Subsidiary of Common Parent - Wildfire Liability Insurance - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Wildfire insurance premiums | $ 186 |  |
Long-term insurance receivable due from affiliate | 1,000 |  | $ 1,000
Prepaid insurance | 169 |  | 13
Current payables due to affiliate | 62 |  | $ 4
Wildfire insurance expense | $ 31 | $ 36 |

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