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Stock-Based Awards - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended
May 31, 2013
Jun. 15, 2013
Jun. 16, 2012
Apr. 30, 2012
RSAs [Member]
2012 Stock Plan [Member]
Jun. 15, 2013
RSAs [Member]
2012 Stock Plan [Member]
Jun. 15, 2013
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Pre-tax stock-based compensation expense related to stock-based awards   $ 12 $ 5     $ 12
Accelerated Stock Compensation resulted by deemed change-in-control           $ 9
Award units grant to certain employees 9     1    
Fair value of the options at grand date $ 2.78          
Share granted to certain employees at a fair value       $ 6.15    
Term for payout of awards over achievement of financial goals         3 years