Consolidated Statements of Changes in Shareholders Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Other comprehensive (gain) loss, tax	$ 67	$ 44	$ 39
Purchase of treasury stock	18,200,000	8,100,000	36,800,000
Cash dividends declared, per share	$ 1.00	$ 0.80	$ 0.60
Employee incentive plans and other, shares issued	2,000,000	3,700,000	6,700,000