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Related-Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |
Wildfire Insurance Fund expense | $ 84 | $ 0 |
Southern California Edison |  |  |
Related Party Transaction [Line Items] |  |  |
Wildfire Insurance Fund expense | 84 | 0 |
Southern California Edison | Subsidiary of Common Parent | Wildfire Liability Insurance |  |  |
Related Party Transaction [Line Items] |  |  |
Wildfire insurance premiums |  | 186 |
Long-term insurance receivable due from affiliate | 803 |  | $ 803
Prepaid insurance | 32 |  | $ 10
Wildfire Insurance Fund expense | $ 50 | $ 31 |

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