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Comprehensive Income (Loss) - Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Fuel and oil $ 1,564 $ 1,750 $ 4,514 $ 4,390
Less: Tax expense 44 76 202 254
Interest expense 63 86 193 272
Net income 193 $ 277 717 $ 759
Reclassification to earnings        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net income (38)   (71)  
Fuel derivative contracts | Fuel and Interest Rate Derivatives | Reclassification to earnings        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Fuel and oil (52)   (93)  
Less: Tax expense (12)   (22)  
Net income (40)   (71)  
Interest rate derivatives | Fuel and Interest Rate Derivatives | Reclassification to earnings        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Less: Tax expense 0   1  
Interest expense 2   5  
Net income $ 2   4  
Other Contract | Fuel and Interest Rate Derivatives | Reclassification to earnings        
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Less: Tax expense     4  
Net income     (4)  
Other Income     $ 0