INCOME TAXES - Reconciliation of Differences Between Federal Statutory Tax Rate and Effective Tax Rate (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2026		May 31, 2025	May 31, 2024
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]
Tax provision at statutory rate / U.S. federal statutory income tax rate		$ 4,106		$ 2,974	$ 2,466
Tax Jurisdiction of Domicile [Extensible Enumeration]		us-gaap:DomesticCountryMember
Foreign earnings at other than U.S. rates / Foreign tax effects		$ (77)		(381)	(262)
State tax expense, net of federal benefit				128	81
Effect of changes in tax laws or rates enacted in the current period	[1]	933
Tax credits		(1,587)
Federal research and development credit		(621)		(411)	(372)
Foreign tax credits		(965)
Other		(1)
Nontaxable or nondeductible items		(1,970)
Stock-based compensation		(2,062)		(801)	(624)
Other		92
Settlements and releases from judicial decisions and statute expirations, net				(149)	(124)
Tax contingency interest accrual, net / Changes in unrecognized tax benefits		847		322	157
Domestic tax contingency, net				75	131
Realization of a one-time tax attribute				0	(235)
Other, net / Other adjustments		215	[2]	(40)	56
Total provision for income taxes		$ 2,467		$ 1,717	$ 1,274
U.S. federal statutory tax rate		21.00%		21.00%	21.00%
Foreign tax effects		(0.40%)
Effect of changes in tax laws or rates enacted in the current period	[1]	4.80%
Tax credits		(8.10%)
Federal research and development credit		(3.20%)
Foreign tax credits		(4.90%)
Other		0.00%
Nontaxable or nondeductible items		(10.10%)
Stock-based compensation		(10.60%)
Other		0.50%
Changes in unrecognized tax benefits		4.30%
Other adjustments	[2]	1.10%
Effective income tax rate		12.60%		12.10%	10.90%
Switzerland [Member]
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]
Foreign earnings at other than U.S. rates / Foreign tax effects		$ (377)
Other, net / Other adjustments		$ 21
Foreign tax effects		(1.90%)
Other adjustments		0.10%
Malta [Member]
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]
Foreign earnings at other than U.S. rates / Foreign tax effects		$ 255
Equity allowance		(546)
Other, net / Other adjustments		$ (78)
Foreign tax effects		1.30%
Equity allowance		(2.80%)
Other adjustments		(0.40%)
Bermuda [Member]
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]
Foreign earnings at other than U.S. rates / Foreign tax effects		$ (105)
Income exclusion		$ (263)
Foreign tax effects		0.50%
Income exclusion		(1.40%)
Other Foreign Jurisdictions [Member]
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]
Foreign earnings at other than U.S. rates / Foreign tax effects		$ 1,016
Foreign tax effects		5.20%

[1] Primarily related to the tax effects of enactment of the U.S. One, Big, Beautiful Bill Act.

[2] Includes the tax effects of changes in valuation allowances, effect of cross-border tax laws and state taxes, net of federal benefit. California, Virginia and Missouri represent the majority of the state taxes net of federal benefit.