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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Description of Business, Basis of Presentation and Significant Accounting Policies [Abstract]
Net income (loss) attributable to common stockholders	$ 15	$ 18	$ 4	$ (7)	$ (74)	$ 13	$ (4)	$ (2)	$ 30	$ (67)	$ 125
Weighted average outstanding shares of common stock									119.2	125.8	129.7
Dilutive effect of employee stock options, restricted shares and other stock awards									2.0	0.0	1.8
Common stock and common stock equivalents									121.2	125.8	131.5
Earnings (loss) per share:
Basic (in usd per share)	$ 0.13	$ 0.15	$ 0.03	$ (0.06)	$ (0.61)	$ 0.11	$ (0.03)	$ (0.02)	$ 0.25	$ (0.53)	$ 0.96
Diluted (in usd per share)	$ 0.13	$ 0.15	$ 0.03	$ (0.06)	$ (0.61)	$ 0.10	$ (0.03)	$ (0.02)	$ 0.25	$ (0.53)	$ 0.95

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Description of Business, Basis of Presentation and Significant Accounting Policies [Abstract]

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