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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS - Additional Information (Details)
€ in Millions
12 Months Ended
May 31, 2025
USD ($)
Feb. 28, 2025
USD ($)
Feb. 28, 2025
EUR (€)
Jan. 31, 2025
USD ($)
May 31, 2024
USD ($)
Debt Instrument [Line Items]          
Long-term debt weighted-average interest rate 3.50%        
Long term debt, including current maturities and exclusive of finance leases fair value $ 17,200,000,000       $ 17,500,000,000
Net book value of boeing aircraft $ 1,600,000,000        
Debt exchange offers principal offered       $ 16,200,000,000  
Debt exchange offers principal tendered   $ 10,700,000,000 € 940    
Debt exchange offers principal amended   $ 15,900,000,000      
Financial covenant terms ratio 400.00%        
Line of credit facility, financial covenant, minimum cash consideration for acquisition $ 250,000,000        
Financial covenant compliance ratio 350.00%        
New Three-Year Credit Agreement          
Debt Instrument [Line Items]          
Line of credit facility maximum borrowing capacity $ 1,750,000,000        
Line of credit facility, term 3 years        
Letter of credit maximum sublimit amount $ 125,000,000        
New Five-Year Credit Agreement          
Debt Instrument [Line Items]          
Line of credit facility maximum borrowing capacity $ 1,750,000,000        
Line of credit facility, term 5 years        
Letter of credit maximum sublimit amount $ 125,000,000        
Credit Agreements          
Debt Instrument [Line Items]          
Line of credit outstanding 0        
Commercial paper outstanding 0        
Letter of credit outstanding sublimit unused amount 250,000,000        
Maximum required net unrestricted cash and cash equivalents for financial covenant $ 500,000,000        
Financial covenant terms ratio 350.00%        
Line of credit facility, financial covenant, maximum percentage of adjusted EBITDA 10.00%        
Financial covenant compliance ratio 190.00%        
1.875% due in February 2034          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 970,000,000        
Fixed interest rate 1.875%