v3.26.3
Comprehensive Income - Schedule of Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Aircraft fuel and related taxes $ 2,152 $ 1,331 $ 5,723 $ 3,907
Tax expense 85 14 216 37
Net of tax 270 54 730 118
Other operating expenses 1,026 1,123 3,166 3,346
Interest expense 70 $ 35 188 $ 120
Amounts reclassified from AOCI        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net of tax 23   69  
Fuel derivatives | Fuel derivatives | Amounts reclassified from AOCI        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Aircraft fuel and related taxes 29   86  
Tax expense 7   20  
Net of tax 22   66  
Other | Fuel derivatives | Amounts reclassified from AOCI        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax expense 0   1  
Net of tax 1   3  
Other operating expenses 2   5  
Interest expense $ (1)   $ (1)