ACQUISITIONS Narrative (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2020	May 31, 2019	May 31, 2018
Acquisition [Line Items]
Fair values of restricted stock-based awards and stock options assumed in connection with acquisitions	$ 0	$ 8	$ 3
Goodwill, net	$ 43,769	$ 43,779	$ 43,755
Aconex Limited [Member]
Acquisition [Line Items]
Acquisition completion date			Mar. 28, 2018
Total purchase price			$ 1,200
Cash portion of purchase price			1,200
Fair values of restricted stock-based awards and stock options assumed in connection with acquisitions			7
Intangible assets			377
Net tangible assets (liabilities)			(29)
Goodwill, net			$ 873

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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