Description of Business, Basis of Presentation and Significant Accounting Policies - Components of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Description of Business, Basis of Presentation and Significant Accounting Policies [Abstract]
Net (loss) income attributable to common stockholders	$ (19)	$ 10	$ (1)	$ (10)	$ 15	$ 18	$ 4	$ (7)	$ (20)	$ 30	$ (67)
Weighted average outstanding shares of common stock (in shares)									114.2	119.2	125.8
Dilutive effect of employee stock options, restricted shares and other stock awards (in shares)									0.0	2.0	0.0
Common stock and common stock equivalents (in shares)									114.2	121.2	125.8
(Loss) earnings per share:
Basic (in usd per share)	$ (0.17)	$ 0.09	$ (0.01)	$ (0.09)	$ 0.13	$ 0.15	$ 0.03	$ (0.06)	$ (0.18)	$ 0.25	$ (0.53)
Diluted (in usd per share)	$ (0.17)	$ 0.09	$ (0.01)	$ (0.09)	$ 0.13	$ 0.15	$ 0.03	$ (0.06)	$ (0.18)	$ 0.25	$ (0.53)