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Related-Party Transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2023 | Jun. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023
Related party transactions |  |  |  |  |  |
Long-term insurance receivable due from affiliate |  |  |  |  | $ 496 | $ 501
SCE |  |  |  |  |  |
Related party transactions |  |  |  |  |  |
Wildfire insurance expense |  |  |  | $ 450 |  |
SCE | Wildfire liability insurance | Edison Insurance Services-EIS |  |  |  |  |  |
Related party transactions |  |  |  |  |  |
Wildfire-related insurance premiums | $ 273 |  |  |  |  |
Long-term insurance receivable due from affiliate |  |  |  |  | $ 365 | $ 355
Wildfire insurance expense |  | $ 66 | $ 132 |  |  |

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