EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		May 31, 2018	May 31, 2017	May 31, 2016
Earnings Per Share [Abstract]
Net income		$ 3,825	$ 9,335	$ 8,901
Weighted average common shares outstanding		4,121	4,115	4,221
Dilutive effect of employee stock plans		117	102	84
Dilutive weighted average common shares outstanding		4,238	4,217	4,305
Basic earnings per share		$ 0.93	$ 2.27	$ 2.11
Diluted earnings per share		$ 0.90	$ 2.21	$ 2.07
Shares subject to anti-dilutive restricted stock-based awards and stock options excluded from calculation	[1]	64	74	63

[1] These weighted shares relate to anti-dilutive restricted stock-based awards and stock options as calculated using the treasury stock method and contingently issuable shares under PSO and PSU agreements. Such shares could be dilutive in the future. See Note 13 for information regarding the exercise prices of our outstanding, unexercised stock options.