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Fair Value Of Financial Instruments Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Asset Impairment Charges $ 1 $ 1 $ 2 $ 2  
Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 24   24   $ 38
Contingent consideration liability 26   26   33
Financial and Nonfinancial Liabilities, Fair Value Disclosure 41   41   59
Fair Value, Measurements, Recurring | Commodity derivatives          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Asset 1   1   35
Derivative Liability 13   13    
Fair Value, Measurements, Recurring | Foreign currency derivatives          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Asset 23   23   3
Derivative Liability 2   2   26
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Contingent consideration liability 0   0   0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0   0   0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Commodity derivatives          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Liability 0   0    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Foreign currency derivatives          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Asset 0   0   0
Derivative Liability 0   0   0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 24   24   38
Contingent consideration liability 0   0   0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 15   15   26
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity derivatives          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Asset 1   1   35
Derivative Liability 13   13    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency derivatives          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Asset 23   23   3
Derivative Liability 2   2   26
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Contingent consideration liability 26   26   33
Financial and Nonfinancial Liabilities, Fair Value Disclosure 26   26   33
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Commodity derivatives          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Liability 0   0    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Foreign currency derivatives          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Asset 0   0   0
Derivative Liability 0   0   $ 0
Cost of Sales [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Asset Impairment Charges $ 1 $ 1 $ 2 $ 2