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Description of Business and Summary of Significant Accounting Policies - Schedule of Depreciable Lives and Net Book Value of Our Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2018
May 31, 2017
Property Plant And Equipment [Line Items]    
Net property and equipment $ 28,154 $ 25,981
Wide Body Aircraft and Related Equipment [Member]    
Property Plant And Equipment [Line Items]    
Depreciable lives range 15 to 30 years  
Net property and equipment $ 10,463 9,103
Narrow Body and Feeder Aircraft and Related Equipment [Member]    
Property Plant And Equipment [Line Items]    
Depreciable lives range 5 to 18 years  
Net property and equipment $ 2,908 3,099
Package Handling and Ground Support Equipment [Member]    
Property Plant And Equipment [Line Items]    
Depreciable lives range 3 to 30 years  
Net property and equipment $ 4,028 3,862
Information Technology [Member]    
Property Plant And Equipment [Line Items]    
Depreciable lives range 2 to 10 years  
Net property and equipment $ 1,277 1,114
Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Depreciable lives range 3 to 15 years  
Net property and equipment $ 3,747 3,400
Facilities and Other Property [Member]    
Property Plant And Equipment [Line Items]    
Depreciable lives range 2 to 40 years  
Net property and equipment $ 5,731 $ 5,403