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Accumulated Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest Expense $ 131 $ 114 $ 122
Fuel and oil 4,616 4,076 3,801
Less: Tax Expense 699 $ (92) $ 1,267
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net of tax (20)    
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Fuel and oil (33)    
Less: Tax Expense (8)    
Net of tax (25)    
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest Expense 6    
Less: Tax Expense 1    
Net of tax $ 5