Consolidated Statements of Changes in Shareholders Equity (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Other comprehensive gain (loss), tax	$ 665	$ (1,395)	$ (114)
Cash dividends declared, per share	$ 0.56	$ 0.52	$ 0.48
Employee incentive plans and other, shares issued	4,172,976	2,359,659	2,229,051