INCOME TAXES Continued (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
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	$ 4,031	$ 4,005	$ 4,492
Foreign earnings at other than United States rates	(1,299)	(1,284)	(1,627)
State tax expense, net of federal benefit	150	176	176
Settlements and releases from judicial decisions and statute expirations, net	(189)	(150)	(85)
Domestic production activity deduction	(119)	(155)	(188)
Stock-based compensation	(149)	74	63
Other, net	(243)	(125)	65
Total provision for income taxes	2,182	2,541	$ 2,896
Components of Deferred Tax Assets and Liabilities [Abstract]
Non-current deferred tax assets	1,143	1,291
Non-current deferred tax liabilities (in other non-current liabilities)	(460)	(160)
Net deferred tax assets	$ 683	$ 1,131