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Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Fuel and oil $ (941) $ (936) $ (2,696) $ (2,818)
Interest Expense (31) (31) (93) (92)
Less: Tax Expense 230 $ 349 1,016 $ 987
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Net of Tax 143   491  
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Fuel and oil 224   769  
Less: Tax Expense 83   285  
Net of Tax 141   484  
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Interest Expense 3   11  
Less: Tax Expense 1   4  
Net of Tax $ 2   $ 7