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Earnings per Share - Components of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 13	$ 49	$ 7	$ 67
Weighted average outstanding shares of common stock (in shares)	123.7	129.7	127.3	129.6
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares)	2.1	1.9	1.8	1.7
Common stock and common stock equivalents (in shares)	125.8	131.6	129.1	131.3
Net income per share:
Basic (in dollars per share)	$ 0.11	$ 0.38	$ 0.05	$ 0.52
Diluted (in dollars per share)	$ 0.10	$ 0.37	$ 0.05	$ 0.51

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Earning Per Share: Basic and Diluted [Abstract]

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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