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Derivatives and Risk Management - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Derivative    
Total derivative contracts, net $ 61 $ 13
Prepaid Expenses and Other    
Derivative    
Net derivative contracts, assets 34 35
Other Noncurrent Assets    
Derivative    
Net derivative contracts, assets 59 0
Other Accrued Liabilities    
Derivative    
Net derivative contracts, liabilities (22) (13)
Other Noncurrent Liabilities    
Derivative    
Net derivative contracts, liabilities $ (10) $ (9)