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Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net loss attributable to common stockholders	$ (10)	$ (7)
Weighted average outstanding shares of common stock (in shares)	117.1	121.4
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares)	0.0	0.0
Diluted (in shares)	117.1	121.4
Net loss per share:
Basic (in dollars per share)	$ (0.09)	$ (0.06)
Diluted (in dollars per share)	$ (0.09)	$ (0.06)
Weighted average number of shares outstanding, diluted and anti-dilutive	118.7	123.4
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares)	2.1	2.7

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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