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Related-Party Transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2025 | Jul. 31, 2022 | Mar. 31, 2025 | Jun. 30, 2023 | Sep. 30, 2025 | Dec. 31, 2024
Related party transactions |  |  |  |  |  |
Long-term insurance receivable due from affiliate |  |  |  |  | $ 307 | $ 418
SCE |  |  |  |  |  |
Related party transactions |  |  |  |  |  |
Wildfire insurance expense | $ 50 |  | $ 50 | $ 450 |  |
SCE | Wildfire Liability Insurance | Subsidiary of Common Parent |  |  |  |  |  |
Related party transactions |  |  |  |  |  |
Wildfire-related insurance premiums |  | $ 273 |  |  |  |
Long-term insurance receivable due from affiliate |  |  |  |  | $ 226 | $ 303

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