DERIVATIVE FINANCIAL INSTRUMENTS EFFECTS ON BALANCE SHEETS (Details) - USD ($) $ in Millions	May 31, 2020	May 31, 2019
Derivative assets:
Total derivative assets	$ 29	$ 5
Derivative liabilities:
Total derivative liabilities	268	230
Fair value hedges [Member] | Notes payable, current [Member]
Effects of fair value hedging relationship on hedged item in consolidated balance sheet
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 relationship on hedged item in consolidated balance sheet
Carrying amount of hedged item	3,680	3,652
Cumulative hedging adjustments included in the carrying amount	75	44
Fair value hedges [Member] | Interest Rate Swaps [Member] | Other non-current assets [Member]
Derivative assets:
Total derivative assets	29	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 swap agreements [Member] | Other non-current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	17	17
Cash flow hedges [Member] | Cross-Currency Swaps [Member] | Other current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	251	0
Total derivative liabilities	251	0
Cash flow hedges [Member] | Cross-Currency Swaps [Member] | Other non-current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	0	208
Total derivative liabilities	$ 0	$ 208