Income Taxes (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Current provision (benefit)
Federal	$ 512	$ (120)	$ 79
State and local	86	80	48
Foreign	170	181	198
Current Provision, Total	768	141	325
Deferred provision (benefit)
Federal	175	947	485
State and local	(7)	21	12
Foreign	(42)		(9)
Deferred Provision, Total	126	968	488
Provision for Income Taxes, Total	$ 894	$ 1,109	$ 813