CONSOLIDATED STATEMENTS OF EQUITY PARENTHETICAL - $ / shares shares in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning common stock shares outstanding	4,131	4,343	4,464
Common stock issued under stock-based compensation plans	95	60	70
Common stock issued under stock purchase plans	3	3	3
Repurchase of common stock	(86)	(272)	(194)
Shares repurchased for tax withholdings upon vesting of restricted stock-based awards	(6)	(3)	0
Ending common stock shares outstanding	4,137	4,131	4,343
Dividends declared per common share (in dollars per share)	$ 0.64	$ 0.60	$ 0.51