INCOME TAXES Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Income Tax Examination [Line Items]
Total net deferred tax benefit	$ 2,300
Federal statutory income tax rate, percent	21.00%	21.00%	21.00%
Income tax net benefit, adjustments to estimate of U.S. Tax Cuts and Jobs Act of 2017 one-time transition tax and remeasurement of net deferred tax assets and liabilities			$ 389
Undistributed earnings and other outside basis temporary differences of investments in foreign subsidiaries	$ 7,900
Potential net deferred tax liability related to other outside basis temporary differences	1,400
Deferred Tax Assets, Net [Abstract]
Net deferred tax assets	5,772	$ 3,211
Valuation allowance	1,526	1,359
Operating Loss Carryforwards [Abstract]
Capital loss carryforwards	501
Tax Credit Carryforwards [Abstract]
Tax credit carryforwards subject to limitation on utilization	1,100
Tax credit carryforwards not subject to expiration dates	765
Tax credit carryforwards subject to expiration dates	378
Unrecognized Tax Benefits (Narrative) [Abstract]
Unrecognized tax benefits that would affect our effective tax rate if recognized	4,400	4,300	4,200
Interest and penalties related to uncertain tax positions recognized in our provision for income taxes	166	202	$ 312
Interest and penalties related to uncertain tax positions accrued	$ 1,600	$ 1,400
Earliest Tax Year [Member]
Tax Credit Carryforwards [Abstract]
Tax credit carryforward expiration dates	May 31, 2022
Latest Tax Year [Member]
Tax Credit Carryforwards [Abstract]
Tax credit carryforward expiration dates	May 31, 2041
Federal [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss carryforwards	$ 502
Federal net operating loss carryforwards not subject to expiration	55
Federal [Member] | Expire in various years between fiscal 2022 and fiscal 2038 [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss carryforwards	$ 447
Federal [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards expiration date	May 31, 2022
Federal [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards expiration date	May 31, 2038
State [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss carryforwards	$ 2,000
Capital loss carryforwards expiration date	May 31, 2026
Capital loss carryforwards	$ 661
State [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Capital loss carryforwards expiration date	May 31, 2025
Operating loss carryforwards expiration date	May 31, 2022
State [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Capital loss carryforwards expiration date	May 31, 2026
Operating loss carryforwards expiration date	May 31, 2040
Foreign [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss carryforwards	$ 1,800
Foreign net operating loss carryforwards not subject to expiration	1,700
Foreign net operating loss carryforwards subject to expiration	86
Unrecognized Tax Benefits (Narrative) [Abstract]
Reasonably possible decrease in the next 12 months in gross unrecognized, net of offsetting tax benefits	89
Reasonably possible decrease in the next 12 months in gross unrecognized tax benefits	$ 197
Foreign [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards expiration date	May 31, 2022
Foreign [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards expiration date	May 31, 2041
Domestic [Member]
Unrecognized Tax Benefits (Narrative) [Abstract]
Reasonably possible decrease in the next 12 months in gross unrecognized, net of offsetting tax benefits	$ 671
Reasonably possible decrease in the next 12 months in gross unrecognized tax benefits	$ 798