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Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt   $ 3,420  
Derivative Liability $ 1    
Unrealized Loss on Foreign Currency Derivatives, before Tax 1    
Long-term Debt 1,789   $ 3,815
Long-term Debt, fair value 1,784   2,745
Fair Value Inputs, Level 1 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt, fair value 0   0
Fair Value Inputs, Level 2 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt, fair value 1,721   2,679
Fair Value Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt, fair value $ 63   $ 66