v3.25.3
Comprehensive Income - Schedule of AOCI Components (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 8,000 $ 10,350
Deferred tax impact, beginning balance 11 8
Changes in fair value 0 (69)
Changes in fair value, deferred tax impact 0 21
Reclassification to earnings 29 88
Reclassification to earnings, deferred tax impact (9) (27)
Balance at end of period 7,776 7,776
Deferred tax impact, ending balance 2 2
Accumulated other comprehensive income (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (35) (25)
Balance at end of period (6) (6)
Fuel derivatives    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (209) (193)
Changes in fair value 0 (90)
Reclassification to earnings 36 110
Balance at end of period (173) (173)
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 (4) (7)
Changes in fair value 0 0
Reclassification to earnings 2 5
Balance at end of period $ (2) $ (2)