v2.4.0.6
Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2010
Commitments and Contingencies Disclosure [Line Items]      
Expiration date of operating lease, lower limit 1    
Expiration date of operating lease, upper limit 23    
Rent expense $ 494 $ 446 $ 416
Minimum rental commitments, 2013 408    
Minimum rental commitments, 2014 387    
Minimum rental commitments, 2015 271    
Minimum rental commitments, 2016 224    
Minimum rental commitments, 2017 186    
Minimum rental commitments, thereafter 662    
Letters of credit outstanding $ 138 $ 99