Income Taxes - Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Current:
Federal	$ 434	$ 289	$ 298
State	69	51	57
Foreign	398	488	435
Current Income Tax Expense (Benefit), Total	901	828	790
Deferred:
Federal	1	(48)	(62)
State	(4)	5	0
Foreign	(90)	(29)	(38)
Total Deferred Income Tax Expense (Benefit), Total	(93)	(72)	(100)
Income tax expense	$ 808	$ 756	$ 690