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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Operating Property and Equipment, net (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Flight equipment $ 52,696 $ 48,448
Other property and equipment 11,908 10,527
Purchase deposits for flight equipment 3,427 3,550
Total operating property and equipment 68,031 62,525
Less—Accumulated depreciation and amortization (25,123) (22,710)
Total operating property and equipment, net $ 42,908 $ 39,815
Aircraft, spare engines and related rotable parts | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 25 years  
Aircraft, spare engines and related rotable parts | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 30 years  
Aircraft seats | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 10 years  
Aircraft seats | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 15 years  
Buildings | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 25 years  
Buildings | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 45 years  
Other property and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 3 years  
Other property and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 15 years  
Computer software | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 5 years  
Computer software | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 15 years  
Building improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 1 year  
Building improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 40 years