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		6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015	May 31, 2016
Fair Values of Derivative and Non-Derivative Instruments Designated as Hedges in Condensed Consolidated Balance Sheets [Abstract]
Fair value, assets	$ 54		$ 54		$ 122
Fair value, liabilities	(268)		(268)		(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	(77)	$ 13	(68)	$ 14
Amount of Gain (Loss) on Hedged Item Recognized in Income Attributable to Risk Being Hedged	77	(13)	68	(14)
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	54		54		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)	(54)	(67)	(51)	(45)
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)	(73)	(82)	(72)	(31)
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	(268)		(268)		(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)	44	49	43	18
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	$ (938)		$ (938)		$ (991)