Investments (Trust gain loss) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments
Gross realized gains	$ 150	$ 339	$ 255
Gross realized losses	(127)	(24)	(6)
Net unrealized (losses) gains for equity securities	$ (369)	$ 103	$ 176

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