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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Asset derivative contracts, net $ 120 $ 95
Fuel derivatives | Prepaid expenses and other current assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 67 43
Gross liability amounts offset in the Balance Sheet 0 0
Asset derivative contracts, net 67 43
Fuel derivatives | Other Assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 120 95
Gross liability amounts offset in the Balance Sheet 0 0
Asset derivative contracts, net [1] $ 120 $ 95
[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 9.