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FAIR VALUE MEASUREMENTS - Narrative (Details) - Fuel hedge contracts - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain (loss) on derivatives recognized $ 89 $ (140) $ 9 $ (96)
Mark-to-Market        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loss on derivative     4  
Settlement Losses on Contracts        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain on derivative     $ 13