Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) ("AOCI") (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 24,168
Translation adjustments	(147)	$ 129
Ending Balance	24,321	19,462
Foreign Currency Translation Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(785)	(1,207)
Translation adjustments	(147)	129
Ending Balance	(932)	(1,078)
Retirement Plans Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	53	60
Reclassifications from AOCI	(2)	(2)
Ending Balance	51	58
Accumulated Other Comprehensive (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(732)	(1,147)
Ending Balance	$ (881)	$ (1,020)