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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Nov. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 shares	Sep. 30, 2025 USD ($) mi² shares	Sep. 30, 2024 shares
Organization
Coverage period					20 years
Antidilutive awards excluded from earnings per share (in shares) | shares			9,956,033	20,371	9,346,533	2,040,879
Revenue not yet approved		$ 1,300
Requested increase revenue requirement		$ 220
Requested increase revenue requirement (as a percent)		20.00%
SCE
Organization
Supply of electricity area covered (in square miles) | mi²					50,000
Initial fixed contribution amount					$ 2,400
Additional aggregate contribution					1,900
Revenue not yet approved	$ 9,700		$ 9,700		9,700
Requested increase revenue requirement	1,100
Increase in authorized revenues					$ 902
Impairment of utility property, plant and equipment	$ 88

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