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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Summary of Significant Accounting Policies [Line Items]      
Derivative contracts, net $ 17,000,000 $ 5,000,000  
Depreciation and amortization expense related to property and equipment 2,513,000,000 2,341,000,000 $ 2,107,000,000
Amortization of capitalized software 324,000,000 340,000,000 307,000,000
Net book value of capitalized software 933,000,000 932,000,000  
Fuel card obligation 1,100,000,000 1,100,000,000  
Advertising expense 438,000,000 347,000,000 $ 302,000,000
Fuel Card Obligation      
Summary of Significant Accounting Policies [Line Items]      
Purchasing card maximum limit 1,100,000,000    
Fuel card obligation $ 1,100,000,000 $ 1,100,000,000  
Minimum      
Summary of Significant Accounting Policies [Line Items]      
Estimated residual value (percent) 5.00%    
Maximum      
Summary of Significant Accounting Policies [Line Items]      
Estimated residual value (percent) 10.00%    
Software and software development costs | Minimum      
Summary of Significant Accounting Policies [Line Items]      
Estimated useful life 3 years    
Software and software development costs | Maximum      
Summary of Significant Accounting Policies [Line Items]      
Estimated useful life 15 years