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Fair Value Measurements - Schedule of Significant Unobservable Inputs Used to Determine Fair Value for Level 3 (Details) - SCE - Level 3 - Valuation, Market Approach $ in Millions | Sep. 30, 2025 USD ($) $ / MWh | Dec. 31, 2024 USD ($) $ / MWh
--- | --- | ---
CRRs |  |
Fair Value Measurements |  |
Fair value, assets | $ | $ 135 | $ 212
Fair value, liabilities | $ | $ 3 | $ 0
CRRs | Minimum |  |
Fair Value Measurements |  |
Unobservable inputs (in dollars per MWh) | (19.88) | (4.64)
CRRs | Maximum |  |
Fair Value Measurements |  |
Unobservable inputs (in dollars per MWh) | 28,322.72 | 50,048.16
CRRs | Weighted Average |  |
Fair Value Measurements |  |
Unobservable inputs (in dollars per MWh) | 27.79 | 27.20
Fin Toll arrangements |  |
Fair Value Measurements |  |
Fair value, assets | $ | $ 5 |
Fair value, liabilities | $ | $ 0 |
Fin Toll arrangements | Minimum |  |
Fair Value Measurements |  |
Unobservable inputs (in dollars per MWh) | 0.00 |
Fin Toll arrangements | Maximum |  |
Fair Value Measurements |  |
Unobservable inputs (in dollars per MWh) | 89.95 |
Fin Toll arrangements | Weighted Average |  |
Fair Value Measurements |  |
Unobservable inputs (in dollars per MWh) | 33.40 |

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