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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest Expense $ 122 $ 121 $ 130
Fuel and oil 3,647 3,616 5,293
Less: Tax Expense 1,303 $ 1,298 $ 680
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net of tax 622    
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Fuel and oil 973    
Less: Tax Expense 360    
Net of tax 613    
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest Expense 15    
Less: Tax Expense 6    
Net of tax $ 9