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Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to common stockholders	$ 10	$ 18	$ (1)	$ 15
Weighted average outstanding shares of common stock (in shares)	113.2	118.7	115.2	119.9
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares)	1.0	2.0	0.0	1.9
Common stock and common stock equivalents (in shares)	114.2	120.7	115.2	121.8
Net income (loss) per share:
Basic (in dollars per share)	$ 0.09	$ 0.15	$ (0.01)	$ 0.13
Diluted (in dollars per share)	$ 0.09	$ 0.15	$ (0.01)	$ 0.12
Weighted average number of shares outstanding, diluted and anti-dilutive (in shares)			116.6
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares)	1.6	2.5	1.6	2.5

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