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Financing Arrangements - Additional Information (Details)
 1 Months Ended 9 Months Ended
Mar. 16, 2021
USD ($)
Aug. 31, 2020
USD ($)
Feb. 28, 2021
USD ($)
air-craft
May 31, 2020
USD ($)
Line Of Credit Facility [Line Items]        
Number of Boeing aircraft | air-craft     19  
Net book value of Boeing aircraft     $ 1,900,000,000  
Letter of credit maximum sublimit amount     $ 250,000,000  
Financial covenant terms ratio     475.00%  
Financial covenant compliance ratio     245.00%  
Commercial paper outstanding     $ 0  
Letters Of Credit Outstanding     200,000  
Long term debt, including current maturities and exclusive of finance leases carrying value     22,900,000,000 $ 21,500,000,000
Long term debt, including current maturities and exclusive of finance leases fair value     $ 25,900,000,000 $ 22,800,000,000
Long-term debt weighted-average interest rate     3.50%  
Subsequent Event [Member]        
Line Of Credit Facility [Line Items]        
Financial covenant terms ratio 350.00%      
Five-Year Credit Agreement [Member]        
Line Of Credit Facility [Line Items]        
Line of credit facility, term     5 years  
Line of credit facility maximum borrowing capacity     $ 2,000,000,000.0  
Line of credit facility, expiration date     2026-03  
364-Day Credit Agreement [Member]        
Line Of Credit Facility [Line Items]        
Line of credit facility, term     364 days  
Line of credit facility maximum borrowing capacity     $ 1,500,000,000  
Line of credit facility, expiration date     2022-03  
364-Day Credit Agreement [Member] | Subsequent Event [Member]        
Line Of Credit Facility [Line Items]        
Line of credit facility, term 364 days      
Line of credit facility maximum borrowing capacity $ 1,500,000,000      
Amended and Restated Five-Year Credit Agreement [Member]        
Line Of Credit Facility [Line Items]        
Line of credit facility, term     5 years  
Line of credit facility maximum borrowing capacity     $ 2,000,000,000.0  
Revolving Credit Facility        
Line Of Credit Facility [Line Items]        
Line of credit facility outstanding for future borrowings     $ 3,500,000,000  
1.875% due in February 2034 [Member]        
Line Of Credit Facility [Line Items]        
Debt instrument, face amount   $ 970,000,000    
Fixed interest rate   1.875%    
Debt instrument, maturity date   2034-02