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Related-Party Transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Related party transactions |  |  |  |  |  |  |  |
Long-term insurance receivable due from affiliate |  | $ 549 |  | $ 549 |  |  |  | $ 465
SCE |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |
Wildfire insurance expense |  |  |  |  |  | $ 450 | $ 437 |
SCE | Wildfire liability insurance | Edison Insurance Services-EIS |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |
Wildfire-related insurance premiums | $ 273 |  |  |  |  |  |  |
Insurance purchased but not reinsured | $ 93 |  |  |  |  |  |  |
Insurance income and related expense |  |  |  | 44 |  |  |  |
Prepaid insurance |  |  |  |  |  |  |  | 106
Long-term insurance receivable due from affiliate |  | 431 |  | 431 |  |  |  | $ 334
Wildfire insurance expense |  | $ 0 | $ 67 | $ 132 | $ 146 |  |  |

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