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AOCI - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other operating expenses $ (463) $ (698)
Fuel and oil 469 870
Other (gains) losses, net 48 (28)
Less: Tax Expense (30) $ 50
Reclassification out of Accumulated Other Comprehensive Income (Loss)    
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net of Tax (29)  
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Fuel derivatives    
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Less: Tax Expense 5  
Net of Tax 17  
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income (Loss)    
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Fuel and oil 16  
Other (gains) losses, net 6  
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income (Loss)    
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other operating expenses 1  
Less: Tax Expense 0  
Net of Tax 1  
Unrealized gain on deferred compensation plan investment | Reclassification out of Accumulated Other Comprehensive Income (Loss)    
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Less: Tax Expense (13)  
Net of Tax (47)  
Other (gains) losses, net $ (60)