INCOME TAXES Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Deferred Tax Assets and Liabilities (Narrative) [Abstract]
Temporary differences related to undistributed foreign earnings	$ 38,000
Other outside basis temporary differences of investments in foreign subsidiaries	8,400
Potential net deferred tax liability associated with these undistributed foreign earnings	11,800
Potential net deferred tax liability related to other outside basis temporary differences	2,700
Net deferred tax assets	993	$ 1,364
Valuation allowance	$ 1,024	1,053
Income Tax Uncertainties [Abstract]
Income tax examinations	Our U.S. federal and, with some exceptions, our state income tax returns have been examined for all years prior to fiscal 2003 and we are no longer subject to audit for those periods. With some exceptions, we are generally no longer subject to tax examinations in non-U.S. jurisdictions for years prior to fiscal 1997.
Tax Credit Carryforward [Line Items]
Tax credit carryforwards subject to limitation on utilization	$ 904
Tax credit carryforwards not subject to expiration dates	573
Tax credit carryforwards subject to expiration dates	331
Unrecognized Tax Benefits (Narrative) [Abstract]
Unrecognized tax benefits that would affect our effective tax rate if recognized	2,800	2,600	$ 3,600
Interest and penalties related to uncertain tax positions accrued	756	693
Interest and penalties related to uncertain tax positions recognized in our provision for income taxes	102	$ 24	$ 31
Reasonably possible decrease in the next 12 months in gross unrecognized tax benefits related to domestic audits, net of offsetting tax benefits	358
Reasonably possible decrease in gross unrecognized tax benefits related to foreign audits, net of offsetting tax benefits	$ 86
Earliest Tax Year [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward expiration dates	May 31, 2016
Latest Tax Year [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward expiration dates	May 31, 2034
Federal [Member]
Operating loss carryforwards [Line Items]
Net operating loss carryforwards	$ 958
Federal [Member] | Earliest Tax Year [Member]
Operating loss carryforwards [Line Items]
Operating loss carryforwards expiration date	May 31, 2016
Federal [Member] | Latest Tax Year [Member]
Operating loss carryforwards [Line Items]
Operating loss carryforwards expiration date	May 31, 2034
State [Member]
Operating loss carryforwards [Line Items]
Net operating loss carryforwards	$ 2,900
State [Member] | Earliest Tax Year [Member]
Operating loss carryforwards [Line Items]
Operating loss carryforwards expiration date	May 31, 2016
State [Member] | Latest Tax Year [Member]
Operating loss carryforwards [Line Items]
Operating loss carryforwards expiration date	May 31, 2034
Foreign [Member]
Operating loss carryforwards [Line Items]
Net operating loss carryforwards	$ 1,600
Foreign net operating loss carryforwards not subject to expiration	1,400
Foreign net operating loss carryforwards subject to expiration	216
Reasonably possible decrease in the next 12 months in gross unrecognized tax benefits	$ 172
Foreign [Member] | Earliest Tax Year [Member]
Operating loss carryforwards [Line Items]
Operating loss carryforwards expiration date	May 31, 2016
Foreign [Member] | Latest Tax Year [Member]
Operating loss carryforwards [Line Items]
Operating loss carryforwards expiration date	May 31, 2035
Domestic [Member]
Operating loss carryforwards [Line Items]
Reasonably possible decrease in the next 12 months in gross unrecognized tax benefits	$ 426