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Summary of Quarterly Operating Results (Unaudited) (Parenthetical) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2018
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2018
May 31, 2017
May 31, 2016
Selected Quarterly Financial Information [Line Items]                        
Retirement plans mark-to-market adjustment   $ (10)       $ (24)       $ (10) $ (24) $ 1,498
Goodwill and other asset impairment charges   380               380    
TNT integration expenses   136 $ 106 $ 122 $ 112 124 $ 78 $ 58 $ 68      
Tax benefit from corporate structuring transactions   255               (255) [1] (68) [1] $ (76) [1]
Tax benefits from foreign tax credits   133 12 $ 80           225    
Income tax benefit related to lower statutory Income tax rate on earnings   $ 100 165             265    
Provisional benefit related to remeasurement of net U.S. deferred tax liability $ (1,150)   (1,150)             (1,150)    
Charges for legal reserves related to U.S. CBP pending protection matters           39         39  
Ground independent contractor litigation expense           $ 22         22  
U.S. Plans [Member]                        
Selected Quarterly Financial Information [Line Items]                        
Additional provisional amount recognized one time benefit 204   204                  
Company contributions $ 1,500   $ 1,500             $ 2,500 $ 2,000  
[1] The 2018 and 2017 net benefits consist of foreign deferred tax benefits of $434 million and $94 million, respectively, which were partially offset by U.S. deferred tax expenses of $179 million and $26 million, respectively.