Income Taxes (Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 0	$ 2	$ 0
State	0	13	(179)
Total current	0	15	(179)
Deferred:
Federal	101	(103)	83
State	7	(74)	(40)
Total deferred	108	(177)	43
Total income tax expense (benefit)	108	(162)	(136)
SCE
Current:
Federal	0	0	0
State	5	2	(45)
Total current	5	2	(45)
Deferred:
Federal	149	(44)	83
State	30	(67)	(21)
Total deferred	179	(111)	62
Total income tax expense (benefit)	$ 184	$ (109)	$ 17