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Comprehensive Income (Loss) - Reclassifications (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Fuel and oil $ 3,310 $ 1,849 $ 4,347
Other (gains) losses, net (22) 158 8
Less: Tax expense 348 (1,182) 657
Other operating expenses 2,394 1,926 3,026
Net income (loss) 977 $ (3,074) $ 2,300
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) (34)    
Defined benefit plan items | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other (gains) losses, net (60)    
Less: Tax expense (13)    
Net income (loss) (47)    
Fuel derivative contracts | Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Fuel and oil 4    
Other (gains) losses, net 6    
Less: Tax expense 2    
Net income (loss) 8    
Interest rate derivatives | Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Less: Tax expense 1    
Other operating expenses 6    
Net income (loss) $ 5