Income Taxes, Benefit From (Provision For) Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current portion of income tax provision:
Federal	$ (2)	$ (12)	$ (2)
State	(18)	(20)	(18)
Foreign	0	0	(2)
Total current portion	(20)	(32)	(22)
Deferred portion of income tax provision:
Federal	(16)	17	(20)
State	(28)	(29)	(40)
Foreign	(1)	0	0
Total deferred portion	(45)	(12)	(60)
Total provision for income taxes	$ (65)	$ (44)	$ (82)