v3.26.3
FAIR VALUE MEASUREMENTS - Narrative (Details) - Fuel hedge contracts - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain (loss) on derivatives recognized $ (416) $ (21) $ (719) $ 12
Mark-to-Market        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain (loss) on derivatives recognized     (3)  
Settlement Losses on Contracts        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain (loss) on derivatives recognized     $ (716)