Income Taxes (Details 1) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Current provision (benefit)
Federal	$ 795	$ 624	$ 512
State and local	102	56	86
Foreign	214	194	170
Current Provision, Total	1,111	874	768
Deferred provision (benefit)
Federal	(474)	360	802
State and local	(47)	82	93
Foreign	(13)	18	(41)
Deferred Provision, Total	(534)	460	854
Provision for Income Taxes, Total	$ 577	$ 1,334	$ 1,622