v3.7.0.1
FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions
Aug. 31, 2017
May 31, 2017
Assets [Abstract]    
Corporate debt securities and other $ 43,580 $ 41,618
Commercial paper debt securities 4,210 5,053
Money market funds 1,502 3,302
Derivative financial instruments 40 40
Total assets 49,332 50,013
Liabilities [Abstract]    
Derivative financial instruments 106 191
Fair Value Measurements Using Input Types Level 1 [Member]    
Assets [Abstract]    
Corporate debt securities and other 427 580
Commercial paper debt securities 0 0
Money market funds 1,502 3,302
Derivative financial instruments 0 0
Total assets 1,929 3,882
Liabilities [Abstract]    
Derivative financial instruments 0 0
Fair Value Measurements Using Input Types Level 2 [Member]    
Assets [Abstract]    
Corporate debt securities and other 43,153 41,038
Commercial paper debt securities 4,210 5,053
Money market funds 0 0
Derivative financial instruments 40 40
Total assets 47,403 46,131
Liabilities [Abstract]    
Derivative financial instruments $ 106 $ 191