Income Taxes - Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Current:
Federal	$ 371	$ 432	$ 286
State	93	69	51
Foreign	398	398	488
Current Income Tax Expense (Benefit), Total	862	899	825
Deferred:
Federal	8	0	(47)
State	(3)	(4)	5
Foreign	(16)	(90)	(29)
Total Deferred Income Tax Expense (Benefit)	(11)	(94)	(71)
Income tax expense	$ 851	$ 805	$ 754