Income Taxes - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Schedule Of Income Tax [Line Items]
Income tax expense (benefit)	$ 1	$ (9)	$ 1	$ (4)
Federal
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards					$ 1,800
State
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards					$ 63