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Income Taxes - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule Of Income Tax [Line Items]
Income tax expense (benefit)	$ 0	$ 3	$ 1	$ (1)
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

X

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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