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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
 12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Goodwill [Line Items]      
Goodwill impairment charges [1] $ 374,000,000    
Other impairments of goodwill 0 $ 0 $ 0
Intangible assets amortization expense 87,000,000 $ 91,000,000 $ 14,000,000
Corporate, Other and Eliminations [Member]      
Goodwill [Line Items]      
Goodwill impairment charges [1] $ 374,000,000    
[1] Impairment charges related to the goodwill impairment of FedEx Supply Chain described below.