DERIVATIVE FINANCIAL INSTRUMENTS EFFECTS ON BALANCE SHEET (Details) - USD ($) $ in Millions	Aug. 31, 2018	May 31, 2018
Derivative assets:
Total derivative assets	$ 16	$ 29
Derivative liabilities:
Total derivative liabilities	170	158
Fair value hedges [Member] | Notes payable and other borrowings, current [Member]
Effects of fair value hedging relationship on hedged item in condensed consolidated balance sheet [Abstract]
Carrying amount of hedged item	1,495	1,492
Cumulative hedging adjustments included in the carrying amount	(4)	(7)
Fair value hedges [Member] | Notes payable and other borrowings, non-current [Member]
Effects of fair value hedging relationship on hedged item in condensed consolidated balance sheet [Abstract]
Carrying amount of hedged item	5,570	5,584
Cumulative hedging adjustments included in the carrying amount	(34)	(19)
Fair value hedges [Member] | Interest rate swap agreements [Member] | Other current liabilities [Member]
Derivative assets:
Total derivative assets	15	24
Fair value hedges [Member] | Interest rate swap agreements [Member] | Other non-current assets [Member]
Derivative liabilities:
Total derivative liabilities	4	7
Fair value hedges [Member] | Interest rate swap agreements [Member] | Other non-current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	49	48
Fair value hedges [Member] | Cross-Currency Interest Rate Swap [Member] | Other current liabilities [Member]
Derivative assets:
Total derivative assets	1	5
Cash flow hedges [Member] | Cross-currency swap agreements [Member] | Other non-current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	$ 117	$ 103