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Schedule of Amortization Expense for Finite-Lived Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2013
Jan. 31, 2012
Goodwill And Intangible Assets [Abstract]    
2014 $ 44  
2015 35  
2016 32  
2017 27  
2018 18  
2019 and thereafter 17  
Net carrying value $ 173 $ 159