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FINANCIAL DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Future hedging period for jet fuel (in months)     24 months
Current unrealized net loss in OCI   $ 96 $ 96
Derivative [Line Items]      
Change in fair value, loss recognized   $ 37  
Interest Rate Swap      
Derivative [Line Items]      
Terminated amount $ 150    
Gain on terminated derivatives $ 23