INCOME TAXES - Reconciliation of Differences Between Federal Statutory Tax Rate and Effective Tax Rate (Details) - USD ($) $ in Millions	5 Months Ended	12 Months Ended
May 31, 2018	May 31, 2020	May 31, 2019	May 31, 2018
Reconciliation of Differences Between Amount Computed by Applying Federal Statutory Rate to our Income Before Provision for Income Taxes and Provision for Income Taxes [Abstract]
U.S. federal statutory tax rate	21.00%	21.00%	21.00%	29.20%
Tax provision at statutory rate		$ 2,533	$ 2,576	$ 3,629
Impact of Tax Cuts and Jobs Act of 2017
One-time transition tax		0	(529)	7,781
Deferred tax effects		0	140	(911)
Foreign earnings at other than United States rates		(496)	(1,053)	(1,132)
State tax expense, net of federal benefit		172	163	121
Settlements and releases from judicial decisions and statute expirations, net		(137)	(132)	(252)
Tax contingency interest accrual, net		163	245	105
Domestic production activity deduction		0	0	(87)
Federal research and development credit		(151)	(159)	(174)
Stock-based compensation		(166)	(201)	(302)
Other, net		10	135	59
Total provision for income taxes		$ 1,928	$ 1,185	$ 8,837

Effective income tax rate reconciliation tax cuts and jobs act 2017 deferred tax effect amount.

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Effective income tax rate reconciliation tax cuts and jobs act 2017 one time transaction tax amount.

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Impact of tax cut and job act of 2017.

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Reconciliation of Differences Between Amount Computed by Applying Federal Statutory Rate to our Income Before Provision for Income Taxes and Provision for Income Taxes [Abstract]

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Settlements and releases from judicial decisions and statute expirations, net

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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