v2.4.0.6
Short Term Investments Classified as Available for Sale (Detail) (USD $)
In Millions, unless otherwise specified
Nov. 30, 2012
May 31, 2012
Available-for-sale investments:    
Available-for-sale investments $ 1,234 $ 1,440
U.S. Treasury and Agencies
   
Available-for-sale investments:    
Available-for-sale investments 930 1,157
Commercial paper and bonds
   
Available-for-sale investments:    
Available-for-sale investments $ 304 $ 283