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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 3,337 $ 3,563
Reclassifications into earnings, net of taxes 2 (1)
Change in fair value, net of taxes 1 (4)
Ending balance 2,633 3,373
Reclassification into earnings, tax 0 0
Change in fair value, tax 0 (1)
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (4) 0
Ending balance (1) (5)
Aircraft fuel derivatives (1)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (3) 1
Reclassifications into earnings, net of taxes 2 (1)
Change in fair value, net of taxes 1 (4)
Ending balance 0 (4)
Available-for-sale securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (1) (1)
Reclassifications into earnings, net of taxes 0 0
Change in fair value, net of taxes 0 0
Ending balance $ (1) $ (1)