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Earnings Per Share - Weighted Average Number of Anti-Dilutive Shares (Detail) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities [Line Items]
Anti-dilutive potential common shares	4	6
Stock options
Antidilutive Securities [Line Items]
Anti-dilutive potential common shares	3	5
Restricted stock units and awards
Antidilutive Securities [Line Items]
Anti-dilutive potential common shares	1	1

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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