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Identified Intangible Assets and Goodwill - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2010
Goodwill and Intangible Assets Disclosure [Line Items]      
Decrease in unamortized intangible assets due to the effect of foreign exchange fluctuations $ 2    
Amortization expense, which is included in selling and administrative expense 22 16 14
Estimated amortization expense for intangible assets subject to amortization, 2013 21    
Estimated amortization expense for intangible assets subject to amortization, 2014 19    
Estimated amortization expense for intangible assets subject to amortization, 2015 15    
Estimated amortization expense for intangible assets subject to amortization, 2016 14    
Estimated amortization expense for intangible assets subject to amortization, 2017 $ 13