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Derivatives and Risk Management - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivative    
Total derivative contracts, net $ (76) $ (83)
Prepaid Expenses and Other    
Derivative    
Net derivative contracts, assets 14 0
Other Noncurrent Assets    
Derivative    
Net derivative contracts, assets 0 1
Other Accrued Liabilities    
Derivative    
Net derivative contracts, liabilities (31) (68)
Other Noncurrent Liabilities    
Derivative    
Net derivative contracts, liabilities $ (59) $ (16)