v2.4.0.6
Short-Term Investments Classified as Available-For-Sale (Detail) (USD $)
In Millions, unless otherwise specified
May 31, 2012
May 31, 2011
Available-for-sale investments:    
Available-for-sale investments $ 1,440 $ 2,583
U.S. Treasury and Agencies
   
Available-for-sale investments:    
Available-for-sale investments 1,157 1,781
Corporate commercial paper and bonds
   
Available-for-sale investments:    
Available-for-sale investments $ 283 $ 802