Income Taxes (Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 0	$ 13	$ 0
State	(179)	(22)	6
Total current	(179)	(9)	6
Deferred:
Federal	83	(230)	(243)
State	(40)	(66)	(41)
Total deferred	43	(296)	(284)
Total income tax (benefit) expense	(136)	(305)	(278)
SCE
Current:
Federal	0	12	0
State	(45)	(26)	14
Total current	(45)	(14)	14
Deferred:
Federal	83	(207)	(206)
State	(21)	(56)	(37)
Total deferred	62	(263)	(243)
Total income tax (benefit) expense	$ 17	$ (277)	$ (229)