Income Taxes - Schedule of Net Deferred Tax Liabilities (Details) - USD ($) $ in Millions		May 31, 2020	May 31, 2019
Deferred Tax Assets Liabilities Net [Abstract]
Noncurrent deferred tax assets	[1]	$ 1,347	$ 1,340
Noncurrent deferred tax liabilities		(3,162)	(2,821)
Net deferred tax liabilities		$ (1,815)	$ (1,481)

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