DERIVATIVE FINANCIAL INSTRUMENTS EFFECTS ON EARNINGS AND AOCL (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Derivative [Line Items]
Non-operating (expenses) income, net	$ (11)	$ 92	$ (13)	$ 191
Interest expense	(600)	(465)	(1,214)	(959)
Non-Operating (Expenses) Income, Net [Member]
Derivative [Line Items]
Non-operating (expenses) income, net	(11)	92	(13)	191
Effects of derivative instruments designated as hedges on income [Abstract]:
Total gain (loss) on hedges recognized in income	11	(8)	123	(19)
Interest Expense [Member]
Derivative [Line Items]
Interest expense	(600)	(465)	(1,214)	(959)
Effects of derivative instruments designated as hedges on income [Abstract]:
Total gain (loss) on hedges recognized in income	0	0	0	0
Fair value hedges [Member] \| Non-Operating (Expenses) Income, Net [Member] \| Interest Rate Swaps [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Derivative instruments	0	0	0	0
Hedged items	0	0	0	0
Fair value hedges [Member] \| Non-Operating (Expenses) Income, Net [Member] \| Cross-currency interest rate swap agreements [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Derivative instruments	(2)	5	70	(13)
Hedged items	1	(3)	(62)	12
Fair value hedges [Member] \| Interest Expense [Member] \| Interest Rate Swaps [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Derivative instruments	(7)	(4)	(12)	12
Hedged items	7	4	12	(12)
Fair value hedges [Member] \| Interest Expense [Member] \| Cross-currency interest rate swap agreements [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Derivative instruments	2	(16)	4	7
Hedged items	(2)	16	(4)	(7)
Cash flow hedges [Member] \| Cross-Currency Swap Agreements [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Cross-currency swap agreements designated as cash flow hedges	6	(2)	114	(34)
Cash flow hedges [Member] \| Non-Operating (Expenses) Income, Net [Member] \| Cross-Currency Swap [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Amount of gain (loss) reclassified from accumulated OCI	12	(10)	115	(18)
Cash flow hedges [Member] \| Interest Expense [Member] \| Cross-Currency Swap [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Amount of gain (loss) reclassified from accumulated OCI	$ 0	$ 0	$ 0	$ 0

Nonoperating income expense including elimination of net income loss attributable to noncontrolling interests.

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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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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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