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Business Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Segment Reporting Information [Line Items]        
Revenues $ 16,526 $ 14,997 $ 48,136 $ 44,591
Operating Income 1,001 1,025 3,380 3,456
FedEx Express Segment [Member]        
Segment Reporting Information [Line Items]        
Revenues 9,370 8,569 27,376 25,671
Operating Income 424 557 1,574 1,873
FedEx Ground Segment [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,222 4,688 14,790 13,397
Operating Income 634 515 1,781 1,590
FedEx Freight Segment [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,694 1,492 5,208 4,747
Operating Income 55 41 349 264
FedEx Services Segment [Member]        
Segment Reporting Information [Line Items]        
Revenues 397 389 1,213 1,198
Eliminations, Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Revenues (157) (141) (451) (422)
Operating Income $ (112) $ (88) $ (324) $ (271)