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Earnings Per Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share Disclosure
Incremental Common Shares Attributable to Accelerated Share Repurchase Agreements		1
Stock Appreciation Rights
Earnings Per Share Disclosure
Anti-dilutive securities	11	27
Stock Options
Earnings Per Share Disclosure
Anti-dilutive securities		3

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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