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DESCRIPTION OF BUSINESS SEGMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 2 Months Ended 12 Months Ended 32 Months Ended
Jun. 09, 2025
$ / shares
Jun. 30, 2024
USD ($)
employee
Jul. 21, 2025
USD ($)
May 31, 2025
USD ($)
aircraft
bank
location
$ / shares
shares
May 31, 2024
USD ($)
aircraft
$ / shares
shares
May 31, 2023
USD ($)
aircraft
$ / shares
shares
May 31, 2023
USD ($)
employee
Jun. 01, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2021
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Gross contract assets related to in-transit shipments       $ 673,000,000 $ 672,000,000          
Contract assets net of deferred unearned revenue       526,000,000 463,000,000          
Contract liabilities related to advance payments from customers       23,000,000 23,000,000          
Advertising and promotion expenses       425,000,000 421,000,000 $ 435,000,000        
Depreciation and amortization       4,264,000,000 4,287,000,000 4,176,000,000        
Capitalized interest       $ 55,000,000 81,000,000 77,000,000        
Number of aircraft to be permanently retired from service | aircraft       12            
Number of aircraft engines to be permanently retired from service | aircraft       8            
Noncash impairment charges       $ 21,000,000 157,000,000 70,000,000        
Noncash impairment charges net of tax       $ 16,000,000 $ 120,000,000 $ 54,000,000        
Noncash impairment charges net of tax per diluted share (in dollars per share) | $ / shares       $ 0.06 $ 0.48 $ 0.21        
Number of idle aircraft | aircraft       22            
Expected revenue service       10 months            
Purchase of treasury stock (in shares) | shares       10.9 9.8 9.2        
Payments for repurchase of common stock       $ 3,017,000,000 $ 2,500,000,000 $ 1,500,000,000        
Cash dividends declared (in dollars per share) | $ / shares       $ 5.52 $ 3.78 $ 5.86        
Number of employees left or voluntarily leaving | employee   1,400         5,000      
Consultation process expected occur period   18 months                
Expected cash expenditures   $ 150,000,000                
Business optimization costs       $ 756,000,000 $ 582,000,000 $ 273,000,000        
Business optimization costs, net of tax       $ 577,000,000 $ 444,000,000 $ 209,000,000        
Business optimization costs (in dollar per share) | $ / shares       $ 2.37 $ 1.77 $ 0.81        
Cost incurred to date       $ 235,000,000            
Aggregate pre-tax cost of business optimization       1,600,000,000            
Business realignment costs       0 $ 0 $ 36,000,000 $ 430,000,000      
Business realignment costs, net of tax           $ 27,000,000        
Business realignment costs per diluted share | $ / shares           $ 0.11        
Business employee severance costs paid           $ 118,000,000        
Freight spin off costs       56,000,000            
Freight spin off costs, net of tax       $ 44,000,000            
Freight spin off costs (in dollar per share) | $ / shares       $ 0.18            
Professional fees       $ 38,000,000            
Debt issuance costs       $ 18,000,000            
Network 2.0 Optimization                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Number of business locations | location       290            
Subsequent Event                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Cash dividends declared (in dollars per share) | $ / shares $ 1.45                  
2022 Repurchase Program                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Stock repurchase program amount authorized to be repurchased                   $ 5,000,000,000.0
Purchase of treasury stock (in shares) | shares           9.2        
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares           $ 163.39        
Payments for repurchase of common stock           $ 1,500,000,000        
2024 Repurchase Program                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Stock repurchase program amount authorized to be repurchased                 $ 5,000,000,000.0  
Purchase of treasury stock (in shares) | shares         9.8          
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares         $ 255.34          
Payments for repurchase of common stock         $ 2,500,000,000          
2024 Repurchase Program | Subsequent Event                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Stock repurchase program amount authorized to be repurchased, remaining available amount     $ 1,600,000,000              
Payments for repurchase of common stock     $ 500,000,000              
2021 And 2024 Stock Repurchase Program                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Stock repurchase program amount authorized to be repurchased, remaining available amount               $ 5,100,000,000    
Accelerated Share Repurchase Agreement                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Purchase of treasury stock (in shares) | shares       10.9            
Number of banks | bank       2            
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares       $ 274.34            
Payments for repurchase of common stock       $ 3,000,000,000.0            
Share repurchases benefit per diluted share (in dollars per share) | $ / shares       $ 0.44            
Supply Chain Finance                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Outstanding payment obligations       $ 71,000,000 $ 94,000,000 $ 83,000,000 $ 83,000,000      
Boeing 757-200 aircraft                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Number of aircraft to be permanently retired from service | aircraft       2 22 4        
Number of aircraft engines to be permanently retired from service | aircraft         7 1        
Airbus A300-600 aircraft                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Number of aircraft to be permanently retired from service | aircraft       7   2        
Number of aircraft engines to be permanently retired from service | aircraft           8        
Boeing MD-11F aircraft                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Number of aircraft to be permanently retired from service | aircraft       3   12        
Number of aircraft engines to be permanently retired from service | aircraft           25        
Decrease in depreciation       $ 19,000,000            
Minimum                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Intangible assets amortization periods       1 year            
Expected cash expenditures       $ 250,000,000            
Minimum | Wide-body aircraft and related equipment                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Depreciable lives range       18 years            
Maximum                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Intangible assets amortization periods       15 years            
Expected cash expenditures       $ 275,000,000            
Maximum | Wide-body aircraft and related equipment                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Depreciable lives range       30 years            
Payment Interval One                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Contract with customer, periodic payment term       15 days            
Payment Interval Two                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Contract with customer, periodic payment term       30 days            
Payment Interval Three                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Contract with customer, periodic payment term       45 days            
Payment Interval Four                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Contract with customer, periodic payment term       90 days