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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Nov. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 shares | Sep. 30, 2025 USD ($) mi² shares | Sep. 30, 2024 shares
Organization |  |  |  |  |  |
Coverage period |  |  |  |  | 20 years |
Antidilutive awards excluded from earnings per share (in shares) | shares |  |  | 9,956,033 | 20,371 | 9,346,533 | 2,040,879
Revenue not yet approved |  | $ 1,300 |  |  |  |
Requested increase revenue requirement |  | $ 220 |  |  |  |
Requested increase revenue requirement (as a percent) |  | 20.00% |  |  |  |
SCE |  |  |  |  |  |
Organization |  |  |  |  |  |
Supply of electricity area covered (in square miles) | mi² |  |  |  |  | 50,000 |
Initial fixed contribution amount |  |  |  |  | $ 2,400 |
Additional aggregate contribution |  |  |  |  | 1,900 |
Revenue not yet approved | $ 9,700 |  | $ 9,700 |  | 9,700 |
Requested increase revenue requirement | 1,100 |  |  |  |  |
Increase in authorized revenues |  |  |  |  | $ 902 |
Impairment of utility property, plant and equipment | $ 88 |  |  |  |  |

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