Income Taxes - Schedule of Reconciliation of Total Income Tax Expense and Amount Computed by Statutory Federal Income Tax Rate to Income Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Taxes computed at federal statutory rate	$ 1,401	$ 350	$ 138
Benefit from U.S. tax loss carryback to prior years	(279)	(71)
State and local income taxes, net of federal benefit	179	53	44
Foreign operations	138	38	(1)
Benefits from share-based payments	(69)	(5)	(18)
Uncertain tax positions	65	(14)	8
Foreign tax rate enactments	(61)	(10)	50
Non-deductible expenses	53	70	79
Valuation allowance	14	(129)	(79)
Goodwill impairment charges		75
U.S. deferred tax adjustments related to foreign operations		51
Tax Cuts and Jobs Act (“TCJA”)			(71)
Foreign tax credits from distributions			(8)
Other, net	2	(25)	(27)
Provision for Income Taxes, Total	$ 1,443	$ 383	$ 115
Effective Tax Rate	21.60%	23.00%	17.60%