EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		May 31, 2016	May 31, 2015	May 31, 2014
Computation of Basic and Diluted Earnings Per Share [Abstract]
Net income		$ 8,901	$ 9,938	$ 10,955
Weighted average common shares outstanding		4,221	4,404	4,528
Dilutive effect of employee stock plans		84	99	76
Dilutive weighted average common shares outstanding		4,305	4,503	4,604
Basic earnings per share		$ 2.11	$ 2.26	$ 2.42
Diluted earnings per share		$ 2.07	$ 2.21	$ 2.38
Shares subject to anti-dilutive restricted stock-based awards and stock options excluded from calculation	[1]	63	37	76

[1] These weighted shares relate to restricted stock-based awards and to anti-dilutive stock options as calculated using the treasury stock method and could be dilutive in the future. See Note 14 for information regarding the exercise prices of our outstanding, unexercised options.