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Related-Party Transactions (Details) - Southern California Edison - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Current insurance receivable due from affiliate | $ 448 |  |  |  |  | $ 448 |  | $ 0
Subsidiary of Common Parent | Wildfire Liability Insurance |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Wildfire insurance premiums |  | $ 176 |  | $ 74 | $ 186 |  |  |
Current insurance receivable due from affiliate | 448 |  |  |  |  | 448 |  | 0
Long-term insurance receivable due from affiliate | 354 |  |  |  |  | 354 |  | 803
Prepaid insurance | 85 |  |  |  |  | 85 |  | $ 10
Wildfire-related insurance premiums | $ 45 |  | $ 51 |  |  | $ 145 | $ 123 |

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