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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Offsetting Assets [Line Items]    
Asset derivative contracts, net $ 120 $ 9
Fuel derivatives | Prepaid expenses and other current assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 61 41
Gross amounts offset in the Balance Sheet (48) (26)
Asset derivative contracts, net 13 15
Fuel derivatives | Other Assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 178 7
Gross amounts offset in the Balance Sheet (58) 0
Asset derivative contracts, net [1] 120 7
Fuel derivatives | Accrued Liabilities    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 516 1,737
Gross amounts offset in the Balance Sheet (516) (1,737)
Asset derivative contracts, net [1] 0 0
Fuel derivatives | Other Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 0 985
Gross amounts offset in the Balance Sheet 0 (985)
Asset derivative contracts, net [1] 0 0
Interest rate derivatives | Other Assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 0 2
Gross amounts offset in the Balance Sheet 0 0
Asset derivative contracts, net [1] $ 0 $ 2
[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.