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, 2014	$ 15,277	$ 32	$ 2,643	$ 16,229	$ 506	$ (4,133)
Net income	1,050			1,050
Other comprehensive 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)
Net income	1,820			1,820
Other comprehensive loss, net of tax	(341)				(341)
Purchase of treasury stock	(2,722)					(2,722)
Cash dividends declared	(277)			(277)
Employee incentive plans and other	311		106	(72)		277
Ending balance at May. 31, 2016	13,784	32	2,892	18,371	(169)	(7,342)
Net income	2,997			2,997
Other comprehensive loss, net of tax	(246)				(246)
Purchase of treasury stock	(509)					(509)
Cash dividends declared	(426)			(426)
Employee incentive plans and other	473		113	(109)		469
Ending balance at May. 31, 2017	$ 16,073	$ 32	$ 3,005	$ 20,833	$ (415)	$ (7,382)