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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Offsetting Assets [Line Items]    
Asset derivative contracts, net $ 77 $ 120
Fuel derivatives | Prepaid expenses and other current assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 4 61
Gross liability amounts offset in the Balance Sheet (2) (48)
Asset derivative contracts, net 2 13
Fuel derivatives | Other Assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 128 178
Gross liability amounts offset in the Balance Sheet (51) (58)
Asset derivative contracts, net [1] 77 120
Fuel derivatives | Accrued Liabilities    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 483 516
Gross liability amounts offset in the Balance Sheet (483) (516)
Asset derivative contracts, net [1] $ 0 $ 0
[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 5.