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Investments - Schedule of Gains and Losses for the Trust Investments (Details) - SCE - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investments
Gross realized gains	$ 36	$ 84	$ 82	$ 186
Gross realized losses	(8)	(8)	(14)	(22)
Net unrealized gains for equity securities	$ 104	$ 31	$ 190	$ 116

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