Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2019	May 31, 2018	May 31, 2017
Goodwill [Line Items]
Goodwill impairment charges	[1]		$ 374
Intangible assets amortization expense		$ 82	87	$ 91
Corporate, Other and Eliminations [Member]
Goodwill [Line Items]
Goodwill impairment charges	[1]		$ 374

[1] Impairment charges related to the goodwill impairment of FedEx Supply Chain described below.