v3.26.1
Basis of Presentation - Schedule of Change in Accounting Estimate (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Change in Accounting Estimate [Line Items]        
Total passenger revenues $ 8,432 $ 7,244 $ 15,682 $ 13,672
Net income $ 233 $ 213 $ 460 $ 64
Net income per basic share (in dollars per share) $ 0.48 $ 0.40 $ 0.93 $ 0.11
Net income per diluted share (in dollars per share) $ 0.47 $ 0.39 $ 0.92 $ 0.11
Breakage Revenue Reversal        
Change in Accounting Estimate [Line Items]        
Total passenger revenues $ (285)      
Net income $ (185)      
Net income per basic share (in dollars per share) $ (0.38)      
Net income per diluted share (in dollars per share) $ (0.37)