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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fuel derivatives | Prepaid expenses and other current assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets $ 13 $ 41
Gross liability amounts offset in the Balance Sheet (13) (26)
Asset derivative contracts, net [1] 0 15
Fuel derivatives | Other Assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 11 7
Gross liability amounts offset in the Balance Sheet (9) 0
Asset derivative contracts, net [1] 2 7
Fuel derivatives | Accrued Liabilities    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 885 1,737
Gross liability amounts offset in the Balance Sheet (885) (1,737)
Asset derivative contracts, net [1] 0 0
Fuel derivatives | Other Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 308 985
Gross liability amounts offset in the Balance Sheet (273) (985)
Asset derivative contracts, net [1] 35 0
Interest rate derivatives | Other Assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 13 2
Gross liability amounts offset in the Balance Sheet 0 0
Asset derivative contracts, net [1] $ 13 $ 2
[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.