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Leases (Schedule of Rental Expense for Facilities and Equipment) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Leases [Abstract]      
Gross rental expense $ 181 $ 154 $ 158
Less lease and sublease income (6) (4) (6)
Net rental expense $ 175 $ 150 $ 152