INCOME TAXES Continued (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
Deferred Tax Assets and Liabilities As Recorded [Abstract]
Current deferred tax assets	$ 877	$ 1,189
Non-current deferred tax assets	595	1,076
Current deferred tax liabilities (in other current liabilities)	(28)	(101)
Non-current deferred tax liabilities (in other non-current liabilities)	(48)	(59)
Net deferred tax assets	1,396	2,105
Reconciliation of Differences between Amount Computed by Applying Federal Statutory Rate to Our Income Before Provision for Income Taxes and Provision for Income Taxes [Abstract]
Tax provision at statutory rate	4,537	3,994	2,885
Foreign earnings at other than United States rates	(1,474)	(1,125)	(672)
State tax expense, net of federal benefit	171	188	161
Settlements and releases from judicial decisions and statute expirations, net	(132)	(53)	(315)
Domestic production activity deduction	(178)	(206)	(95)
Other, net	57	66	144
Total provision for income taxes	$ 2,981	$ 2,864	$ 2,108