Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Current:
Federal	$ 304	$ 596	$ 259
State	71	80	104
Foreign	568	369	499
Total	943	1,045	862
Deferred:
Federal	(57)	(66)	19
State	(16)	(11)	(3)
Foreign	(7)	(36)	(27)
Total	(80)	(113)	(11)
Income tax expense	$ 863	$ 932	$ 851