EARNINGS PER SHARE (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2014		Aug. 31, 2013
Computation of Basic and Diluted Earnings Per Share [Abstract]
Net income	$ 2,184		$ 2,191
Weighted average common shares outstanding	4,451		4,608
Dilutive effect of employee stock plans	97		66
Dilutive weighted average common shares outstanding	4,548		4,674
Basic earnings per share	$ 0.49		$ 0.48
Diluted earnings per share	$ 0.48		$ 0.47
Shares subject to anti-dilutive stock options and restricted stock-based awards excluded from calculation	26	[1]	289	[1]

[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.