DERIVATIVE FINANCIAL INSTRUMENTS EFFECTS ON EARNINGS AND AOCL (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Derivative [Line Items]
Non-operating income, net	$ 4	$ 198	$ 195	$ 681
Interest expense	456	509	1,416	1,557
Non-Operating Income, Net [Member]
Derivative [Line Items]
Non-operating income, net	4	198	195	681
Effects of derivative instruments designated as hedges on income [Abstract]:
Total gain (loss) on hedges recognized in income	(19)	14	(38)	(25)
Interest Expense [Member]
Derivative [Line Items]
Interest expense	456	509	1,416	1,557
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 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 Income, Net [Member] \| Cross-Currency Interest Rate Swaps [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Derivative instruments	0	7	(13)	(21)
Hedged items	(1)	(4)	11	22
Fair value hedges [Member] \| Interest Expense [Member] \| Interest Rate Swaps [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Derivative instruments	10	43	22	5
Hedged items	(10)	(43)	(22)	(5)
Fair value hedges [Member] \| Interest Expense [Member] \| Cross-Currency Interest Rate Swaps [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Derivative instruments	6	9	13	10
Hedged items	(6)	(9)	(13)	(10)
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	(11)	(7)	(45)	(62)
Cash flow hedges [Member] \| Non-Operating Income, Net [Member] \| Cross-Currency Swaps [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Amount of gain (loss) reclassified from accumulated OCI or OCL	(18)	11	(36)	(26)
Cash flow hedges [Member] \| Interest Expense [Member] \| Cross-Currency Swaps [Member]
Effects of derivative instruments designated as hedges on income [Abstract]:
Amount of gain (loss) reclassified from accumulated OCI or OCL	$ 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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