Income Taxes - Provision (Benefit) for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
—Federal	$ 3	$ 3	$ 1
—State	3	2	1
—Foreign	4	1	0
Current income tax expense (benefit), total	10	6	2
Deferred
—Federal	15	13	(66)
—State	10	5	(24)
—Foreign	1	2	(3)
Deferred income tax (benefit)	26	20	(93)
Income tax provision (benefit) – continuing operations	$ 36	$ 26	$ (91)