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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2015
May. 31, 2015
Assets [Abstract]    
U.S. Treasury securities $ 615 $ 668
Commercial paper debt securities 10,170 9,203
Corporate debt securities and other 31,349 28,844
Derivative financial instruments 75 74
Total assets 42,209 38,789
Liabilities [Abstract]    
Derivative financial instruments $ 222 244
Marketable security investments maturity information [Abstract]    
Maturity of marketable security investments

As of August 31, 2015 and May 31, 2015, approximately 35% and 28%, respectively, of our marketable securities investments mature within one year and 65% and 72%, respectively, mature within one to six years.

  
Long Term Debt [Abstract]    
Total debt $ 42,000 42,000
Fair Value Measurements Using Input Types Level 1 [Member]    
Assets [Abstract]    
U.S. Treasury securities 615 668
Corporate debt securities and other 153 190
Total assets 768 858
Fair Value Measurements Using Input Types Level 2 [Member]    
Assets [Abstract]    
Commercial paper debt securities 10,170 9,203
Corporate debt securities and other 31,196 28,654
Derivative financial instruments 75 74
Total assets 41,441 37,931
Liabilities [Abstract]    
Derivative financial instruments 222 244
Total debt fair value $ 43,300 $ 44,100