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DERIVATIVE FINANCIAL INSTRUMENTS EFFECTS ON EARNINGS AND AOCL (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2019
Derivative [Line Items] |  |  |  |
Non-operating (expenses) income, net | $ (11) | $ 92 | $ (13) | $ 191
Interest expense | (600) | (465) | (1,214) | (959)
Non-Operating (Expenses) Income, Net [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Non-operating (expenses) income, net | (11) | 92 | (13) | 191
Effects of derivative instruments designated as hedges on income [Abstract]: |  |  |  |
Total gain (loss) on hedges recognized in income | 11 | (8) | 123 | (19)
Interest Expense [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest expense | (600) | (465) | (1,214) | (959)
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 (Expenses) 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 (Expenses) Income, Net [Member] | Cross-currency interest rate swap agreements [Member] |  |  |  |
Effects of derivative instruments designated as hedges on income [Abstract]: |  |  |  |
Derivative instruments | (2) | 5 | 70 | (13)
Hedged items | 1 | (3) | (62) | 12
Fair value hedges [Member] | Interest Expense [Member] | Interest Rate Swaps [Member] |  |  |  |
Effects of derivative instruments designated as hedges on income [Abstract]: |  |  |  |
Derivative instruments | (7) | (4) | (12) | 12
Hedged items | 7 | 4 | 12 | (12)
Fair value hedges [Member] | Interest Expense [Member] | Cross-currency interest rate swap agreements [Member] |  |  |  |
Effects of derivative instruments designated as hedges on income [Abstract]: |  |  |  |
Derivative instruments | 2 | (16) | 4 | 7
Hedged items | (2) | 16 | (4) | (7)
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 | 6 | (2) | 114 | (34)
Cash flow hedges [Member] | Non-Operating (Expenses) Income, Net [Member] | Cross-Currency Swap [Member] |  |  |  |
Effects of derivative instruments designated as hedges on income [Abstract]: |  |  |  |
Amount of gain (loss) reclassified from accumulated OCI | 12 | (10) | 115 | (18)
Cash flow hedges [Member] | Interest Expense [Member] | Cross-Currency Swap [Member] |  |  |  |
Effects of derivative instruments designated as hedges on income [Abstract]: |  |  |  |
Amount of gain (loss) reclassified from accumulated OCI | $ 0 | $ 0 | $ 0 | $ 0

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