DERIVATIVE FINANCIAL INSTRUMENTS EFFECTS ON EARNINGS AND AOCL (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Derivative [Line Items]
Non-operating (expenses) income, net	$ (17)	$ 4	$ (30)	$ 195
Interest expense	(585)	(456)	(1,799)	(1,416)
Non-Operating (Expenses) Income, Net [Member]
Derivative [Line Items]
Non-operating (expenses) income, net	(17)	4	(30)	195
Effects of derivative instruments designated as hedges on income [Abstract]:
Total gain (loss) on hedges recognized in income	27	(19)	150	(38)
Interest Expense [Member]
Derivative [Line Items]
Interest expense	(585)	(456)	(1,799)	(1,416)
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	16	0	86	(13)
Hedged items	(11)	(1)	(73)	11
Fair value hedges [Member] \| Interest Expense [Member] \| Interest Rate Swaps [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Derivative instruments	(7)	10	(19)	22
Hedged items	7	(10)	19	(22)
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	(8)	6	(4)	13
Hedged items	8	(6)	4	(13)
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	15	(11)	129	(45)
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	22	(18)	137	(36)
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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