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Stock-Based Awards - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
May 31, 2013
Jul. 31, 2012
Nov. 30, 2013
Dec. 01, 2012
Nov. 30, 2013
Dec. 01, 2012
Apr. 30, 2012
RSAs [Member]
2012 Stock Plan [Member]
Nov. 30, 2013
RSAs [Member]
2012 Stock Plan [Member]
Nov. 30, 2013
Stock Options And Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Pre-tax stock-based compensation expense related to stock-based awards     $ 3 $ 2 $ 18 $ 11      
Accelerated Stock Compensation resulted by deemed change-in-control                 $ 9
Award units grant to certain employees 9 8         1    
Fair value of the options at grand date $ 2.78 $ 0.98              
Share granted to certain employees at a fair value             $ 6.15    
Term for payout of awards over achievement of financial goals               3 years