Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Parenthetical) (Detail)

v2.4.0.8
Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Parenthetical) (Detail)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Market condition awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding SARs 1.5 1.5
Exercisable SARs 1.5  
Market and performance condition awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding SARs 0.9 0.9