Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) ("AOCI") (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 24,168
Translation adjustments	$ 91	$ 136	(150)	$ 389
Ending Balance	24,526	21,981	24,526	21,981
Foreign Currency Translation Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1,026)	(954)	(785)	(1,207)
Translation adjustments	91	136	(150)	389
Ending Balance	(935)	(818)	(935)	(818)
Retirement Plans Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	49	56	53	60
Reclassifications from AOCI	(1)	(2)	(5)	(6)
Ending Balance	48	54	48	54
Accumulated Other Comprehensive (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(977)	(898)	(732)	(1,147)
Ending Balance	$ (887)	$ (764)	$ (887)	$ (764)