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Investments - Schedule of Gains and Losses for the Trust Investments (Details) - SCE - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Investments |  |  |  |
Gross realized gains | $ 22 | $ 47 | $ 46 | $ 102
Gross realized losses | (5) | (5) | (6) | (14)
Net unrealized gains/(losses) for equity securities | $ 146 | $ (10) | $ 86 | $ 85

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