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Earnings Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Stock Appreciation Rights
       
Earnings Per Share Disclosure        
Anti-dilutive securities 13 25 12 26
Stock Options
       
Earnings Per Share Disclosure        
Anti-dilutive securities       2
May 1, 2014 ASR
       
Earnings Per Share Disclosure        
Incremental Common Shares Attributable to Accelerated Share Repurchase Agreements     1  
May 21, 2013 ASR
       
Earnings Per Share Disclosure        
Incremental Common Shares Attributable to Accelerated Share Repurchase Agreements       5