ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES Narrative (Details) - USD ($) $ in Millions	3 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
	Feb. 28, 2018	May 31, 2018	Dec. 31, 2017	May 31, 2018	May 31, 2017	May 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Federal statutory income tax rate, percent		21.00%	35.00%	29.20%	35.00%	35.00%
Federal statutory tax rate, approximately				29.00%
Income tax expense related to one-time transition tax, tax cuts and jobs act 2017	$ 166			$ 7,800
Income tax benefit related to remeasurement of deferred tax liabilities, tax cuts and jobs act 2017	$ 76			$ 820
Concentrations of Risk [Abstract]
Customer Concentrations				No single customer accounted for 10% or more of our total revenues in fiscal 2018, 2017 or 2016.
Supplier Concentrations				We outsource the manufacturing, assembly and delivery of certain of our hardware products to a variety of companies, many of which are located outside the United States. Further, we have simplified our supply chain processes by reducing the number of third-party manufacturing partners and the number of locations where these third-party manufacturers build our hardware products. Any inability of these third-party manufacturing partners to deliver the contracted services for our hardware products could adversely impact future operating results of our hardware business.
Credit Risk Concentrations				Financial instruments that are potentially subject to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities, derivatives and trade receivables. Our cash and cash equivalents are generally held with large, diverse financial institutions worldwide to reduce the amount of exposure to any single financial institution. Investment policies have been implemented that limit purchases of marketable debt securities to investment-grade securities. Our derivative contracts are transacted with various financial institutions with high credit standings and any exposure to counterparty credit-related losses in these contracts is largely mitigated with collateral security agreements that provide for collateral to be received or posted when the net fair values of these contracts fluctuate from contractually established thresholds. We generally do not require collateral to secure accounts receivable. The risk with respect to trade receivables is mitigated by credit evaluations we perform on our customers, the short duration of our payment terms for the significant majority of our customer contracts and by the diversification of our customer base.
Inventory Net [Abstract]
Total inventories		$ 398		$ 398	$ 300
Other Receivables [Narrative] [Abstract]
Other receivables included in prepaid expenses and other current assets		$ 802		$ 802	794
Property, Plant and Equipment [Abstract]
Impairment of Property, Plant and Equipment				We did not recognize any significant property impairment charges in fiscal 2018, 2017 or 2016.
Goodwill, Intangible Assets and Impairment Assessments [Abstract]
Goodwill impairment loss				$ 0	0	$ 0
Impairment of intangible assets				We did not recognize any intangible asset impairment charges in fiscal 2018, 2017 or 2016.
Foreign Currency [Abstract]
Net foreign exchange transaction losses included in non-operating income, net				$ 74	152	110
Advertising [Abstract]
Advertising expenses				$ 138	$ 95	$ 68
Research and Development and Software Development Costs [Abstract]
Research Development And Computer Software Activity Description				Software development costs required to be capitalized under ASC 985-20, Costs of Software to be Sold, Leased or Marketed, and under ASC 350-40, Internal-Use Software, were not material to our consolidated financial statements in fiscal 2018, 2017 and 2016.
Minimum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, estimated useful lives				1 year
Goodwill, Intangible Assets and Impairment Assessments [Abstract]
Finite lived intangible assets, useful life				1 year
Maximum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, estimated useful lives				40 years
Goodwill, Intangible Assets and Impairment Assessments [Abstract]
Finite lived intangible assets, useful life				10 years