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Earnings Per Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Appreciation Rights
Earnings Per Share Disclosure
Anti-dilutive securities	24	39	25	36
Stock Options
Earnings Per Share Disclosure
Anti-dilutive securities		3	1	5
May 21, 2013 ASR
Earnings Per Share Disclosure
Incremental Common Shares Attributable to Accelerated Share Repurchase Agreements	4
August 23, 2012 ASR
Earnings Per Share Disclosure
Incremental Common Shares Attributable to Accelerated Share Repurchase Agreements		2

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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