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Comprehensive Loss - Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Fuel and oil expense $ 1,249 $ 1,531
Tax expense (43) (67)
Other operating expenses 1,090 1,018
Net of tax (149) $ (231)
Amounts reclassified from AOCI    
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net of tax 30  
Fuel derivatives | Fuel derivatives | Amounts reclassified from AOCI    
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Fuel and oil expense 38  
Tax expense 9  
Net of tax 29  
Other | Fuel derivatives | Amounts reclassified from AOCI    
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Tax expense 0  
Other operating expenses 1  
Net of tax $ 1