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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of AOCI Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 10,515 $ 10,687
Changes in fair value (80) (240)
Reclassification to earnings 55 (104)
Balance at end of period 10,350 10,515
Accumulated other comprehensive income (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 0 344
Balance at end of period (25) 0
Fuel derivatives | Fuel derivative contracts    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (135) 305
Changes in fair value (130) (312)
Reclassification to earnings 72 (128)
Balance at end of period (193) (135)
Defined benefit plan items    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 149 170
Changes in fair value 25 (11)
Reclassification to earnings (7) (10)
Balance at end of period 167 149
Other    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (15) (32)
Changes in fair value 0 10
Reclassification to earnings 8 7
Balance at end of period (7) (15)
Deferred tax impact    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 1 (99)
Changes in fair value 25 73
Reclassification to earnings (18) 27
Balance at end of period $ 8 $ 1