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Financial Derivative Instruments - Offsetting of Derivative Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Noncurrent Liabilities    
Offsetting Liabilities [Line Items]    
Liabilities derivative contracts, net $ 21 $ 35
Fuel derivatives | Prepaid expenses and other current assets    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 50 48
Gross amounts offset in the Balance Sheet (50) (48)
Liabilities derivative contracts, net 0 0
Fuel derivatives | Other Assets    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 0 58
Gross amounts offset in the Balance Sheet 0 (58)
Liabilities derivative contracts, net [1] 0 0
Fuel derivatives | Accrued Liabilities    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 0 674
Gross amounts offset in the Balance Sheet 0 (516)
Liabilities derivative contracts, net [1] 0 158
Interest rate derivatives | Accrued Liabilities    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 1 0
Gross amounts offset in the Balance Sheet 0 0
Liabilities derivative contracts, net [1] 1 0
Interest rate derivatives | Other Noncurrent Liabilities    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 21 35
Gross amounts offset in the Balance Sheet 0 0
Liabilities derivative contracts, net [1] $ 21 $ 35
[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.