v3.26.1
Comprehensive Income - Schedule of Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Aircraft fuel and related taxes $ 2,215 $ 1,326 $ 3,571 $ 2,575
Tax expense 73 67 132 24
Net of tax 233 213 460 64
Other operating expenses 1,101 1,133 2,139 2,223
Interest expense 64 $ 39 118 $ 85
Amounts reclassified from AOCI        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net of tax 23   46  
Fuel derivatives | Fuel derivatives | Amounts reclassified from AOCI        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Aircraft fuel and related taxes 29   58  
Tax expense 7   14  
Net of tax 22   44  
Other | Fuel derivatives | Amounts reclassified from AOCI        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax expense 0   0  
Net of tax 1   2  
Other operating expenses 2   3  
Interest expense $ (1)   $ (1)