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Investments - Summarizes of Gains and Losses (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investments |  |  |
Gross realized gains | $ 326 | $ 323 | $ 150
Gross realized losses | (24) | (73) | (127)
Net unrealized (losses) gains for equity securities | $ (19) | $ 103 | $ (369)

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