Income Taxes (Details 1) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Current provision
Federal	$ 513	$ 795	$ 624
State and local	72	102	56
Foreign	200	214	194
Current Provision, Total	785	1,111	874
Deferred provision (benefit)
Federal	155	(474)	360
State and local	(18)	(47)	82
Foreign	(2)	(13)	18
Deferred Provision, Total	135	(534)	460
Provision for Income Taxes, Total	$ 920	$ 577	$ 1,334