Income Taxes - Interest and Penalties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Line Items]
Accrued interest and penalties	$ 0	$ 0
Net after-tax interest and penalties tax expense	0	0	$ 0
SCE
Income Tax Disclosure [Line Items]
Accrued interest and penalties	36	28
Net after-tax interest and penalties tax expense	$ 7	$ 4	$ 2