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Operating Segments and Related Information - Additional Information (Detail) (USD $)
In Millions
12 Months Ended
May 31, 2011
May 31, 2010
May 31, 2009
Segment Reporting Disclosure [Line Items]      
Property, Plant and Equipment, net $ 2,115 $ 1,932  
U.S. operations
     
Segment Reporting Disclosure [Line Items]      
Revenues 8,956 7,914 8,020
Property, Plant and Equipment, net 1,115 1,070 1,143
Japan
     
Segment Reporting Disclosure [Line Items]      
Property, Plant and Equipment, net 363 336 322
BELGIUM
     
Segment Reporting Disclosure [Line Items]      
Property, Plant and Equipment, net 182 164 191
China
     
Segment Reporting Disclosure [Line Items]      
Property, Plant and Equipment, net $ 175 $ 144 $ 76