DERIVATIVE FINANCIAL INSTRUMENTS EFFECTS ON BALANCE SHEETS (Details) - USD ($) $ in Millions	Feb. 28, 2021	May 31, 2020
Derivative assets:
Total derivative assets	$ 71	$ 29
Derivative liabilities:
Total derivative liabilities	0	268
Fair value hedges [Member] \| Notes payable, current [Member]
Fair Values of Derivative Instruments Designated as Hedges in Condensed Consolidated Balance Sheets [Abstract]
Carrying amount of hedged item	1,510	0
Cumulative hedging adjustment included in the carrying amount	10	0
Fair value hedges [Member] \| Notes payable and other borrowings, non-current [Member]
Fair Values of Derivative Instruments Designated as Hedges in Condensed Consolidated Balance Sheets [Abstract]
Carrying amount of hedged item	2,220	3,680
Cumulative hedging adjustment included in the carrying amount	108	75
Fair value hedges [Member] \| Interest Rate Swaps [Member] \| Other current assets [Member]
Derivative assets:
Total derivative assets	10	0
Fair value hedges [Member] \| Interest Rate Swaps [Member] \| Other non-current assets [Member]
Derivative assets:
Total derivative assets	0	29
Fair value hedges [Member] \| Cross-currency interest rate swap agreements [Member] \| Other non-current assets [Member]
Derivative assets:
Total derivative assets	61	0
Fair value hedges [Member] \| Cross-currency interest rate swap agreements [Member] \| Other non-current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	0	17
Cash flow hedges [Member] \| Cross-Currency Swap [Member] \| Other current liabilities [Member]
Derivative liabilities:
Total derivative liabilities	$ 0	$ 251

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

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