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Comprehensive Income (Loss) - Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Fuel and oil expense $ 1,326 $ 1,599 $ 2,575 $ 3,130
Tax expense 67 111 24 44
Other operating expenses 1,133 1,093 2,223 2,110
Net of tax 213 $ 367 64 $ 137
Amounts reclassified from AOCI        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net of tax 29   59  
Fuel derivatives | Fuel derivatives | Amounts reclassified from AOCI        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Fuel and oil expense 36   74  
Tax expense 9   17  
Net of tax 27   57  
Other | Fuel derivatives | Amounts reclassified from AOCI        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax expense 0   1  
Other operating expenses 2   3  
Net of tax $ 2   $ 2