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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Apr. 30, 2018
USD ($)
May 31, 2018
USD ($)
air-craft
$ / shares
shares
May 31, 2017
USD ($)
$ / shares
shares
May 31, 2016
USD ($)
$ / shares
shares
Jan. 26, 2016
shares
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Advertising and promotion expenses   $ 442 $ 458 $ 417  
Depreciable life range for majority of aircraft costs   15 to 30 years      
Depreciation expense, excluding gains and losses on sales of property and equipment   $ 3,095 2,995 2,631  
Interest Costs Capitalized   $ 61 $ 41 $ 42  
Number of Idle Aircraft | air-craft   5      
Number of months aircraft remained idle   an average of 20 months      
Gain on sale of TNT express business   $ 85      
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased | shares         25,000,000
Number of Shares Repurchased | shares   4,300,000 3,000,000 18,200,000  
Treasury Stock Acquired, Average Cost Per Share | $ / shares   $ 237.45 $ 172.13 $ 149.35  
Payments for Repurchase of Common Stock   $ 1,017 $ 509 $ 2,722  
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares   12,000,000      
Dividends Payable, Date Declared   Jun. 11, 2018      
Dividends Payable Amount Per Share | $ / shares   $ 0.65      
Dividends Payable, Date To Be Paid   Jul. 09, 2018      
Dividends Payable, Date Of Record   Jun. 25, 2018      
Minimum [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Intangible assets amortization periods   3 years      
Maximum [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Intangible assets amortization periods   15 years      
FedEx Express Segment [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Depreciation expense, excluding gains and losses on sales of property and equipment   $ 1,679 $ 1,662 $ 1,377  
FedEx Express Segment [Member] | TNT Express Business [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Gain on sale of TNT express business $ 85