EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		May. 31, 2015	May. 31, 2014	May. 31, 2013
Computation of Basic and Diluted Earnings Per Share [Abstract]
Net income		$ 9,938	$ 10,955	$ 10,925
Weighted average common shares outstanding		4,404	4,528	4,769
Dilutive effect of employee stock plans		99	76	75
Dilutive weighted average common shares outstanding		4,503	4,604	4,844
Basic earnings per share		$ 2.26	$ 2.42	$ 2.29
Diluted earnings per share		$ 2.21	$ 2.38	$ 2.26
Shares subject to anti-dilutive stock options and restricted stock-based awards excluded from calculation	[1]	37	76	208

[1] These weighted shares relate to anti-dilutive stock options and restricted stock-based awards 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.