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Financing Arrangements - Additional Information (Details)
1 Months Ended 6 Months Ended
Aug. 31, 2020
USD ($)
Nov. 30, 2020
USD ($)
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   490.00%  
Financial covenant compliance ratio   260.00%  
Commercial paper outstanding   $ 0  
Letters Of Credit Outstanding   300,000  
Long term debt, including current maturities and exclusive of finance leases carrying value   22,800,000,000 $ 21,500,000,000
Long term debt, including current maturities and exclusive of finance leases fair value   $ 27,200,000,000 $ 22,800,000,000
Long-term debt weighted-average interest rate   3.50%  
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   2025-03  
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   2021-03  
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