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Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Discrete income tax item	$ 4		$ 4
Income tax expense	6	$ 2	6	$ 1
Pre-tax net loss	$ (5)	$ (6)	$ 5	$ 2
Effective tax rate (percentage)	120.00%	33.30%	(120.00%)	(50.00%)
Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)					21.00%

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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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