FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2013	May 31, 2013
Assets [Abstract]
Commercial paper debt securities	$ 14,544	$ 14,043
Corporate debt securities and other	10,077	4,935
Derivative financial instruments	88	41
Total assets	24,709	19,019
Liabilities [Abstract]
Total debt	24,200	18,500
Marketable security investments maturity information [Abstract]
Maturity of marketable security investments	As of November 30, 2013 and May 31, 2013, approximately 77% and 91%, respectively, of our marketable securities investments mature within one year and 23% and 9%, respectively, mature within one to four years.
Fair Value Measurements Using Input Types Level 1 [Member]
Assets [Abstract]
Corporate debt securities and other	147	246
Total assets	147	246
Fair Value Measurements Using Input Types Level 2 [Member]
Assets [Abstract]
Commercial paper debt securities	14,544	14,043
Corporate debt securities and other	9,930	4,689
Derivative financial instruments	88	41
Total assets	24,562	18,773
Liabilities [Abstract]
Total debt fair value	$ 25,700	$ 20,700