Income Taxes - Schedule of Reconciliation of Total Income Tax Expense and Amount Computed by Statutory Federal Income Tax Rate to Income Before Taxes (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Income Taxes [Line Items]
Provisional benefit related to remeasurement of net U.S. deferred tax liability			$ (1,150)
Foreign deferred tax benefits	$ (128)	$ (17)	(579)
U.S. deferred tax expenses	$ 475	$ (61)	271
Corporate Structuring Transactions [Member]
Income Taxes [Line Items]
Foreign deferred tax benefits			434
U.S. deferred tax expenses			179
U.S. Plans [Member]
Income Taxes [Line Items]
Additional provisional amount recognized one time benefit			$ 204