INCOME TAXES Narrative (Details) - USD ($) $ in Millions	5 Months Ended	12 Months Ended
	May 31, 2018	May 31, 2020	May 31, 2019	May 31, 2018
Income Tax Examination [Line Items]
Federal statutory income tax rate, percent	21.00%	21.00%	21.00%	29.20%
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
Other outside basis temporary differences of investments in foreign subsidiaries		$ 7,900
Potential net deferred tax liability related to other outside basis temporary differences		1,500
Deferred Tax Assets, Net [Abstract]
Net deferred tax assets		3,211	2,432
Valuation allowance		1,359	1,266
Tax Credit Carryforwards [Abstract]
Tax credit carryforwards subject to limitation on utilization		1,100
Tax credit carryforwards not subject to expiration dates		741
Tax credit carryforwards subject to expiration dates		357
Unrecognized Tax Benefits (Narrative) [Abstract]
Unrecognized tax benefits that would affect our effective tax rate if recognized	$ 4,200	4,300	4,200	$ 4,200
Interest and penalties related to uncertain tax positions recognized in our provision for income taxes		202	312	$ 127
Interest and penalties related to uncertain tax positions accrued		$ 1,400	$ 1,300
Earliest Tax Year [Member]
Tax Credit Carryforwards [Abstract]
Tax credit carryforward expiration dates		May 31, 2021
Latest Tax Year [Member]
Tax Credit Carryforwards [Abstract]
Tax credit carryforward expiration dates		May 31, 2038
Federal [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss carryforwards		$ 597
Federal net operating loss carryforwards not subject to expiration		60
Federal [Member] | Expire in various years between fiscal 2020 and fiscal 2038 [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss carryforwards		$ 537
Federal [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards expiration date		May 31, 2021
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
State [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards expiration date		May 31, 2021
State [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards expiration date		May 31, 2038
Foreign [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss carryforwards		$ 1,900
Foreign net operating loss carryforwards not subject to expiration		1,700
Foreign net operating loss carryforwards subject to expiration		133
Unrecognized Tax Benefits (Narrative) [Abstract]
Reasonably possible decrease in the next 12 months in gross unrecognized, net of offsetting tax benefits		42
Reasonably possible decrease in the next 12 months in gross unrecognized tax benefits		$ 105
Foreign [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards expiration date		May 31, 2021
Foreign [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards expiration date		May 31, 2040
Domestic [Member]
Unrecognized Tax Benefits (Narrative) [Abstract]
Reasonably possible decrease in the next 12 months in gross unrecognized, net of offsetting tax benefits		$ 1,000
Reasonably possible decrease in the next 12 months in gross unrecognized tax benefits		$ 1,100