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Business Segments and Disaggregated Revenue - Schedule of Segment Information (Parenthetical) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Segment Reporting Information [Line Items]      
Integration expenses $ 210 $ 270 $ 388
Business realignment costs 116   320
Goodwill and other asset impairment charges   435  
FedEx Express Segment [Member]      
Segment Reporting Information [Line Items]      
Business realignment costs $ 116    
FedEx Office and FedEx Express [Member]      
Segment Reporting Information [Line Items]      
Goodwill and other asset impairment charges   $ 435  
FedEx Ground Segment [Member]      
Segment Reporting Information [Line Items]      
Ground independent contractor legal expense     $ 46