INCOME TAXES - Reconciliation of Differences Between Federal Statutory Tax Rate and Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2021	May 31, 2020	May 31, 2019
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%
Tax provision at statutory rate	$ (2,730)	$ (2,533)	$ (2,576)
Impact of Tax Cuts and Jobs Act of 2017
One-time transition tax	0	0	529
Deferred tax effects	0	0	(140)
Foreign earnings at other than United States rates	580	496	1,053
Net impact of intra-entity IP transfer	2,266	0	0
State tax expense, net of federal benefit	(206)	(172)	(163)
Settlements and releases from judicial decisions and statute expirations, net	582	137	132
Tax contingency interest accrual, net	(55)	(163)	(245)
Domestic tax contingency, net	(282)	(58)	(183)
Federal research and development credit	169	151	159
Stock-based compensation	300	166	201
Other, net	123	48	48
Total benefit from (provision for) income taxes	$ 747	$ (1,928)	$ (1,185)

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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Income tax reconciliation net impact of intra-entity ip tansfer.

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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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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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