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Business Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Segment Reporting Information [Line Items]    
Revenues $ 17,048 $ 17,052
Operating income (loss) 977 1,071
Operating Segments | FedEx Express Segment [Member]    
Segment Reporting Information [Line Items]    
Revenues 8,945 9,222
Operating income (loss) 285 388
Operating Segments | FedEx Ground Segment [Member]    
Segment Reporting Information [Line Items]    
Revenues 5,179 4,799
Operating income (loss) 644 676
Operating Segments | FedEx Freight Segment [Member]    
Segment Reporting Information [Line Items]    
Revenues 1,905 1,959
Operating income (loss) 194 176
Operating Segments | FedEx Services Segment [Member]    
Segment Reporting Information [Line Items]    
Revenues 4 9
Corporate, Other and Eliminations [Member]    
Segment Reporting Information [Line Items]    
Revenues 1,015 1,063
Operating income (loss) $ (146) $ (169)