BASIS OF PRESENTATION, RECENT ACCOUNTING PRONOUNCEMENTS AND OTHER Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jun. 01, 2019	Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		us-gaap:OtherAssetsNoncurrent			us-gaap:OtherAssetsNoncurrent
Right of use assets operating leases		$ 1,800			$ 1,800
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]		us-gaap:OtherLiabilitiesCurrent			us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities		$ 570			$ 570
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]		us-gaap:OtherLiabilitiesNoncurrent			us-gaap:OtherLiabilitiesNoncurrent
Operating lease liabilities		$ 1,300			$ 1,300
Operating lease expenses		153			451
Sublease income		$ 4			12
Cash paid for operating lease liabilities					467
Right of use asset in exchange for operating lease obligation	$ 1,900				$ 2,300
Operating leases weighted average remaining lease term		5 years			5 years
Operating lease obligations, weighted average discount rate		3.20%			3.20%
Contract with Customer, Asset and Liability [Abstract]
Revenues recognized included in opening deferred revenue balance					$ 7,700	$ 7,700
Impairment losses recognized on receivables		$ 0	$ 0		0	0
Revenue, Performance Obligation [Abstract]
Remaining Performance Obligation, Amount, Total		$ 33,800			$ 33,800
Remaining Performance Obligation, Percentage, to be recognized in the next twelve months		60.00%			60.00%
Sales of Financing Receivables [Abstract]
Sales of financing receivables		$ 284	$ 274		$ 1,200	$ 1,300
Scenario Forecast [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right of use asset in exchange for operating lease obligation				$ 383
Minimum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating leases remaining terms					1 year
Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating leases remaining terms					12 years