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Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net (loss) income attributable to common stockholders	$ (1)	$ 4	$ (11)	$ (3)
Weighted average outstanding shares of common stock (in shares)	115.5	119.5	116.3	120.4
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares)	0.0	2.0	0.0	0.0
Common stock and common stock equivalents (in shares)	115.5	121.5	116.3	120.4
Net loss (income) per share:
Basic (in dollars per share)	$ (0.01)	$ 0.03	$ (0.09)	$ (0.02)
Diluted (in dollars per share)	$ (0.01)	$ 0.03	$ (0.09)	$ (0.02)
Weighted average number of shares outstanding, diluted and anti-dilutive (in shares)	116.7		117.7	122.5
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares)	1.6	2.5	1.8	2.6

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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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