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Comprehensive Loss - Schedule of AOCI Components (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period $ 10,350
Changes in fair value (29)
Reclassification to earnings 30
Balance at end of period 9,365
Accumulated other comprehensive income (loss)  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period (25)
Balance at end of period (24)
Fuel derivatives | Fuel derivatives  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period (193)
Changes in fair value (38)
Reclassification to earnings 38
Balance at end of period (193)
Defined benefit plan items  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period 167
Changes in fair value 0
Reclassification to earnings 0
Balance at end of period 167
Other  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period (7)
Changes in fair value 0
Reclassification to earnings 1
Balance at end of period (6)
Deferred tax impact  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period 8
Changes in fair value 9
Reclassification to earnings (9)
Balance at end of period $ 8