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Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)	(150.00%)		(80.00%)	0.00%	(87.50%)
Discrete income tax expense (benefit)	$ (5)	$ 4		$ (5)
Pre-tax net loss	$ (4)		$ (10)	$ 1	$ (8)
Income tax benefit			$ 7		$ 7
Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)						300.00%
Tax expense related to GILTI included in forecasted marginal effective tax rate for 2019						$ 1

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

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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