v3.26.3
Basis of Presentation - Schedule of Change in Accounting Estimate (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Change in Accounting Estimate [Line Items]          
Depreciation and amortization expense $ 398   $ 394 $ 1,198 $ 1,189
NET INCOME $ 270   $ 54 $ 730 $ 118
Net income per basic share (in dollars per share) $ 0.55   $ 0.10 $ 1.48 $ 0.21
Net income per diluted share (in dollars per share) $ 0.55   $ 0.10 $ 1.47 $ 0.21
Total passenger revenues $ 8,422   $ 6,949 $ 24,104 $ 20,621
Service Life          
Change in Accounting Estimate [Line Items]          
Depreciation and amortization expense (48)   (11) (108) (11)
NET INCOME $ 31   $ 7 $ 71 $ 7
Net income per basic share (in dollars per share) $ 0.06   $ 0.01 $ 0.14 $ 0.01
Net income per diluted share (in dollars per share) $ 0.06   $ 0.01 $ 0.14 $ 0.01
Breakage Revenue Reversal          
Change in Accounting Estimate [Line Items]          
NET INCOME       $ (187)  
Net income per basic share (in dollars per share)       $ (0.38)  
Net income per diluted share (in dollars per share)       $ (0.38)  
Total passenger revenues   $ (285)   $ (285)