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Comprehensive Income (Loss) - Schedule of AOCI Components (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 9,365 $ 10,350
Deferred tax impact, beginning balance 8 8
Changes in fair value (40) (69)
Reclassification to earnings 29 59
Changes in fair value, deferred tax impact 12 21
Reclassification to earnings, deferred tax impact 9 18
Deferred tax impact, ending balance 11 11
Balance at end of period 8,000 8,000
Accumulated other comprehensive income (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (24) (25)
Balance at end of period (35) (35)
Fuel derivatives    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (193) (193)
Changes in fair value (52) (90)
Reclassification to earnings 36 74
Balance at end of period (209) (209)
Defined benefit plan items    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 167 167
Changes in fair value 0 0
Reclassification to earnings 0 0
Balance at end of period 167 167
Other    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (6) (7)
Changes in fair value 0 0
Reclassification to earnings 2 3
Balance at end of period $ (4) $ (4)