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Fair Value Of Financial Instruments Narrative (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]          
Derivative, Fair Value, Net $ 9   $ 9   $ 12
Total debt, recorded amount 4,108   4,108   4,149
Asset Impairment Charges 1 $ 1 2 $ 2  
Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration liability 26   26   33
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  
Fair Value, Inputs, Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total debt, fair value 4,042   4,042   4,289
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration liability 0   0   0
Other Current Liabilities | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration liability 7   7   7
Other Long-Term Liabilities | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration liability 19   19   26
Contingent Consideration Liability          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Payments     7 $ 22  
Contingent Consideration Liability | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration liability $ 26   $ 26   $ 33
Minimum [Member] | Contingent Consideration Liability | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Periods in which milestones are expected to be achieved     2018    
Maximum [Member] | Contingent Consideration Liability | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Periods in which milestones are expected to be achieved     2020