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Financial Derivative Instruments - Offsetting of Derivative Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Other Noncurrent Liabilities    
Offsetting Liabilities    
Liabilities derivative contracts, net $ 12 $ 21
Fuel derivatives | Prepaid expenses and other current assets    
Offsetting Liabilities    
Gross amounts of recognized liabilities 0 50
Gross amounts offset in the Balance Sheet 0 (50)
Liabilities derivative contracts, net 0 0
Interest rate derivatives | Accrued Liabilities    
Offsetting Liabilities    
Gross amounts of recognized liabilities 2 1
Gross amounts offset in the Balance Sheet 0 0
Liabilities derivative contracts, net 2 1
Interest rate derivatives | Other Noncurrent Liabilities    
Offsetting Liabilities    
Gross amounts of recognized liabilities 12 21
Gross amounts offset in the Balance Sheet 0 0
Liabilities derivative contracts, net [1] $ 12 $ 21
[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 15.