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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 3,373 $ 3,598 $ 3,563 $ 3,849
Reclassifications into earnings, net of taxes 3 0 2 0
Change in fair value, net of taxes (4) (1) (8) (2)
Ending balance 3,554 3,446 3,554 3,446
Reclassification into earnings, tax 1 0 1 0
Change in fair value, tax (2) 0 (3) 0
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (5) (1) 0 0
Ending balance (6) (2) (6) (2)
Aircraft fuel derivatives        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (4) 0 1 0
Reclassifications into earnings, net of taxes 3 0 2 0
Change in fair value, net of taxes (4) 0 (8) 0
Ending balance (5) 0 (5) 0
Available-for-sale securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1) (1) (1) 0
Reclassifications into earnings, net of taxes 0 0 0 0
Change in fair value, net of taxes 0 (1) 0 (2)
Ending balance $ (1) $ (2) $ (1) $ (2)