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Financial Derivative Instruments - Offsetting of Derivative Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Other Noncurrent Liabilities    
Offsetting Liabilities [Line Items]    
Liabilities derivative contracts, net $ 35 $ 74
Fuel derivatives | Prepaid expenses and other current assets    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 48 26
Gross amounts offset in the Balance Sheet (48) (26)
Liabilities derivative contracts, net 0 0
Fuel derivatives | Other Assets    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 58 0
Gross amounts offset in the Balance Sheet (58) 0
Liabilities derivative contracts, net [1] 0 0
Fuel derivatives | Accrued Liabilities    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 674 2,380
Gross amounts offset in the Balance Sheet (516) (1,737)
Liabilities derivative contracts, net [1] 158 643
Fuel derivatives | Other Noncurrent Liabilities    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 0 1,010
Gross amounts offset in the Balance Sheet 0 (985)
Liabilities derivative contracts, net [1] 0 25
Interest rate derivatives | Other Noncurrent Liabilities    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 35 49
Gross amounts offset in the Balance Sheet 0 0
Liabilities derivative contracts, net [1] $ 35 $ 49
[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.