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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated other comprehensive income (loss), net of taxes      
Beginning balance $ 3,337 $ 3,563 $ 3,849
Reclassifications into earnings, net of tax 7 (6) 4
Change in fair value (1) 2 (4)
Ending balance 2,641 3,337 3,563
Reclassifications into earnings, tax 2 2 (3)
Change in fair value, tax (1) 0 2
Accumulated Other Comprehensive Income (Loss)      
Accumulated other comprehensive income (loss), net of taxes      
Beginning balance (4) 0 0
Ending balance 2 (4) 0
Aircraft Fuel Derivatives      
Accumulated other comprehensive income (loss), net of taxes      
Beginning balance (3) 1 0
Reclassifications into earnings, net of tax 8 (5) 4
Change in fair value (5) 1 (3)
Ending balance 0 (3) 1
Available-for-sale securities      
Accumulated other comprehensive income (loss), net of taxes      
Beginning balance (1) (1) 0
Reclassifications into earnings, net of tax (1) (1) 0
Change in fair value 4 1 (1)
Ending balance $ 2 $ (1) $ (1)