Consolidated Statements of Changes in Shareholders Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning balance at May. 31, 2012	$ 14,727	$ 32	$ 2,595	$ 11,552	$ 629	$ (81)
Net income	2,716			2,716
Other comprehensive gain (loss), net of tax	(22)				(22)
Purchase of treasury stock	(246)					(246)
Cash dividends declared	(176)			(176)
Employee incentive plans and other	399		73			326
Ending balance at May. 31, 2013	17,398	32	2,668	14,092	607	(1)
Net income	2,324			2,324
Other comprehensive gain (loss), net of tax	(101)				(101)
Purchase of treasury stock	(4,857)					(4,857)
Cash dividends declared	(187)			(187)
Employee incentive plans and other	700		(25)			725
Ending balance at May. 31, 2014	15,277	32	2,643	16,229	506	(4,133)
Net income	1,050			1,050
Other comprehensive gain (loss), net of tax	(334)				(334)
Purchase of treasury stock	(1,254)					(1,254)
Cash dividends declared	(227)			(227)
Employee incentive plans and other	481		143	(152)		490
Ending balance at May. 31, 2015	$ 14,993	$ 32	$ 2,786	$ 16,900	$ 172	$ (4,897)