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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	May 31, 2017
Fair Values of Derivative and Non-Derivative Instruments Designated as Hedges in Consolidated Balance Sheets [Abstract]
Fair value, assets	$ 40		$ 40
Fair value, liabilities	(106)		(191)
Interest rate swap agreements [Member] \| Interest expense [Member]
Effects of Derivative and Non-Derivative Instruments Designated as Hedges on Income and Other Comprehensive Income (OCI) or Loss (OCL) [Abstract]
Amount of Gain (Loss) Recognized in Income on Derivative	0	$ 9
Amount of Gain (Loss) on Hedged Item Recognized in Income Attributable to Risk Being Hedged	0	(9)
Fair value hedges [Member] \| Interest rate swap agreements [Member] \| Other assets [Member]
Fair Values of Derivative and Non-Derivative Instruments Designated as Hedges in Consolidated Balance Sheets [Abstract]
Fair value, assets	40		40
Cash flow hedges [Member] \| Cross-currency swap agreements [Member]
Effects of Derivative and Non-Derivative Instruments Designated as Hedges on Income and Other Comprehensive Income (OCI) or Loss (OCL) [Abstract]
Amount of Gain (Loss) Recognized in Accumulated OCI or OCL (Effective Portion)	85	3
Cash flow hedges [Member] \| Cross-currency swap agreements [Member] \| Non-operating income (expense), net [Member]
Effects of Derivative and Non-Derivative Instruments Designated as Hedges on Income and Other Comprehensive Income (OCI) or Loss (OCL) [Abstract]
Amount of Gain (Loss) Reclassified from Accumulated OCI or OCL into Income (Effective Portion)	107	1
Cash flow hedges [Member] \| Cross-currency swap agreements [Member] \| Other non-current liabilities [Member]
Fair Values of Derivative and Non-Derivative Instruments Designated as Hedges in Consolidated Balance Sheets [Abstract]
Fair value, liabilities	(106)		(191)
Net investment hedge [Member] \| Foreign currency borrowings [Member]
Effects of Derivative and Non-Derivative Instruments Designated as Hedges on Income and Other Comprehensive Income (OCI) or Loss (OCL) [Abstract]
Amount of Gain (Loss) Recognized in Accumulated OCI or OCL (Effective Portion)	(64)	$ (1)
Net investment hedge [Member] \| Foreign currency borrowings [Member] \| Notes payable, non-current [Member]
Fair Values of Derivative and Non-Derivative Instruments Designated as Hedges in Consolidated Balance Sheets [Abstract]
Fair value, debt	$ (938)		$ (980)