DERIVATIVE FINANCIAL INSTRUMENTS EFFECTS ON BALANCE SHEETS (Details) - USD ($) $ in Millions	Feb. 29, 2020	May 31, 2019
Derivative assets:
Total derivative assets	$ 22	$ 5
Derivative liabilities:
Total derivative liabilities	274	230
Fair value hedges [Member] \| Notes payable, current [Member]
Effects of fair value hedging relationships on hedged items in condensed consolidated balance sheets
Carrying amount of hedged item	0	1,994
Cumulative hedging adjustments included in the carrying amount	0	(5)
Fair value hedges [Member] \| Notes payable and other borrowings, non-current [Member]
Effects of fair value hedging relationships on hedged items in condensed consolidated balance sheets
Carrying amount of hedged item	3,670	3,652
Cumulative hedging adjustments included in the carrying amount	61	44
Fair value hedges [Member] \| Interest Rate Swaps [Member] \| Other non-current assets [Member]
Derivative assets:
Total derivative assets	22	5
Fair value hedges [Member] \| Interest Rate Swaps [Member] \| Other current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	0	5
Fair value hedges [Member] \| Cross-Currency Interest Rate Swaps [Member] \| Other non-current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	21	17
Cash flow hedges [Member] \| Cross-Currency Swaps [Member] \| Other current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	253	0
Cash flow hedges [Member] \| Cross-Currency Swaps [Member] \| Other non-current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	$ 0	$ 208

Fair value of all liability derivatives designated as cash flow hedging instruments.

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