v3.26.3
Basis of Presentation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 42 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Change in Accounting Estimate [Line Items]            
Non-expiring flight credits issued           $ 7,900
Percentage of flight credits not redeemed 20.00%     20.00%   23.00%
Non-expiring flight credits $ 1,800     $ 1,800    
Total operating revenues $ 8,422   $ 6,949 24,104 $ 20,621  
Breakage Revenue Reversal            
Change in Accounting Estimate [Line Items]            
Total operating revenues   $ (285)   $ (285)