Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Federal	$ 1	$ 0	$ 2
State	7	0	13
Total current	8	0	15
Deferred:
Federal	59	101	(103)
State	(50)	7	(74)
Total deferred	9	108	(177)
Total	17	108	(162)
SCE
Current:
Federal	3	0	0
State	48	5	2
Total current	51	5	2
Deferred:
Federal	118	149	(44)
State	(49)	30	(67)
Total deferred	69	179	(111)
Total	$ 120	$ 184	$ (109)