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Derivatives and Risk Management - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Total derivative contracts, net $ 1 $ 68
Prepaid Expenses and Other    
Derivative [Line Items]    
Net derivative contracts, assets 3 24
Other Noncurrent Assets    
Derivative [Line Items]    
Net derivative contracts, assets 20 53
Other Accrued Liabilities    
Derivative [Line Items]    
Net derivative contracts, liabilities (9) (5)
Other Noncurrent Liabilities    
Derivative [Line Items]    
Net derivative contracts, liabilities $ (13) $ (4)