v3.26.1
Basis of Presentation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 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 8,432 $ 7,244 $ 15,682 $ 13,672  
Breakage Revenue Reversal          
Change in Accounting Estimate [Line Items]          
Total operating revenues $ (285)