PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017
Property, Plant And Equipment [Line Items]
Computer, network, machinery and equipment	$ 6,156	$ 5,112
Buildings and improvements	3,893	3,466
Furniture, fixtures and other	662	651
Land	868	830
Construction in progress	229	235
Total property, plant and equipment	11,808	10,294
Accumulated depreciation	(5,911)	(4,979)
Total property, plant and equipment, net	$ 5,897	$ 5,315
Minimum
Property, Plant And Equipment [Line Items]
Estimated Useful Lives	1 year
Maximum
Property, Plant And Equipment [Line Items]
Estimated Useful Lives	40 years
Computer, network, machinery and equipment | Minimum
Property, Plant And Equipment [Line Items]
Estimated Useful Lives	1 year
Computer, network, machinery and equipment | Maximum
Property, Plant And Equipment [Line Items]
Estimated Useful Lives	5 years
Buildings and improvements | Minimum
Property, Plant And Equipment [Line Items]
Estimated Useful Lives	1 year
Buildings and improvements | Maximum
Property, Plant And Equipment [Line Items]
Estimated Useful Lives	40 years
Furniture, fixtures and other | Minimum
Property, Plant And Equipment [Line Items]
Estimated Useful Lives	5 years
Furniture, fixtures and other | Maximum
Property, Plant And Equipment [Line Items]
Estimated Useful Lives	15 years