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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fuel derivatives | Prepaid expenses and other current assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets $ 41 $ 0
Gross amounts offset in the Balance Sheet (26) 0
Net amounts of assets presented in the Balance Sheet (a) [1] 15 0
Fuel derivatives | Other Assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 7 0
Gross amounts offset in the Balance Sheet 0 0
Net amounts of assets presented in the Balance Sheet (a) [1] 7 0
Fuel derivatives | Accrued Liabilities    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 1,737 1,258
Gross amounts offset in the Balance Sheet (1,737) (1,258)
Net amounts of assets presented in the Balance Sheet (a) [1] 0 0
Fuel derivatives | Other Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 985 355
Gross amounts offset in the Balance Sheet (985) (355)
Net amounts of assets presented in the Balance Sheet (a) [1] 0 0
Interest rate derivatives | Other Assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 2 13
Gross amounts offset in the Balance Sheet 0 0
Net amounts of assets presented in the Balance Sheet (a) [1] $ 2 $ 13
[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.