Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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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		9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016	May 31, 2016
Fair Values of Derivative and Non-Derivative Instruments Designated as Hedges in Condensed Consolidated Balance Sheets [Abstract]
Fair value, assets	$ 23		$ 23		$ 122
Fair value, liabilities	(262)		(262)		(218)
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	(31)	$ 76	(99)	$ 90
Amount of Gain (Loss) on Hedged Item Recognized in Income Attributable to Risk Being Hedged	31	(76)	99	(90)
Fair value hedges [Member] \| Interest rate swap agreements [Member] \| Other assets [Member]
Fair Values of Derivative and Non-Derivative Instruments Designated as Hedges in Condensed Consolidated Balance Sheets [Abstract]
Fair value, assets	23		23		122
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)	6	29	(44)	(16)
Cash flow hedges [Member] \| Cross-currency swap agreements [Member] \| Non-operating income, 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)	2	52	(69)	21
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 Condensed Consolidated Balance Sheets [Abstract]
Fair value, liabilities	(262)		(262)		(218)
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)	(1)	(31)	42	(13)
Amount of Gain (Loss) Reclassified from Accumulated OCI or OCL into Income (Effective Portion)	0	$ 0	0	$ 0
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 Condensed Consolidated Balance Sheets [Abstract]
Fair value, debt	$ (951)		$ (951)		$ (991)