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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 2,697 $ 3,554 $ 3,337 $ 3,563
Reclassifications into earnings, net of taxes 2 (5) 5 (2)
Change in fair value, net of taxes (4) 15 (4) 6
Ending balance 2,644 3,420 2,644 3,420
Reclassification into earnings, tax 0 (2) 1 (1)
Change in fair value, tax (1) 6 (1) 4
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1) (6) (4) 0
Ending balance (3) 4 (3) 4
Aircraft fuel derivatives        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 0 (5) (3) 1
Reclassifications into earnings, net of taxes 2 (5) 6 (2)
Change in fair value, net of taxes (4) 15 (5) 6
Ending balance (2) 5 (2) 5
Available-for-sale securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1) (1) (1) (1)
Reclassifications into earnings, net of taxes 0 0 (1) 0
Change in fair value, net of taxes 0 0 1 0
Ending balance $ (1) $ (1) $ (1) $ (1)