Income Taxes - Schedule of Net Deferred Tax Liabilities (Details) - USD ($) $ in Millions		May 31, 2021	May 31, 2020
Deferred Tax Assets Liabilities Net [Abstract]
Noncurrent deferred tax assets	[1]	$ 1,418	$ 1,347
Noncurrent deferred tax liabilities		(3,927)	(3,162)
Net deferred tax liabilities		$ (2,509)	$ (1,815)

[1] Noncurrent deferred tax assets are included in the line item “Other Assets” in our accompanying consolidated balance sheets.