Income Taxes - Components of (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
U.S. Federal	$ 5	$ 1	$ 5
State	19	1	(2)
Total current	24	2	3
Deferred:
U.S. Federal	4	0	(1)
State	10	(2)	0
Total deferred	14	(2)	(1)
Total provision for income taxes	$ 38	$ 0	$ 2