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Earnings Per Share - Additional Information (Detail) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share Disclosure [Line Items]
Incremental Common Shares Attributable to Accelerated Share Repurchase Agreements	5	1
Stock Appreciation Rights
Earnings Per Share Disclosure [Line Items]
Anti-dilutive securities	24	36	29
Stock option
Earnings Per Share Disclosure [Line Items]
Anti-dilutive securities	1	5	8

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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