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Debt Debt (Senior Notes Narrative) (Details)
€ in Millions, $ in Millions
12 Months Ended
Nov. 05, 2018
USD ($)
Sep. 26, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
[1]
Nov. 05, 2018
EUR (€)
Dec. 11, 2017
EUR (€)
Sep. 26, 2016
EUR (€)
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage     100.00%          
Write off of Deferred Debt Issuance Cost     $ 1 $ 0 $ 3      
Senior Unsecured Notes Due 2023 [Member]                
Debt Instrument [Line Items]                
Senior unsecured notes     $ 857 897        
Long-term Debt, Gross | €               € 750
Percentage of Face               99.713%
Interest Rate     1.125%          
Maturity Date     Sep. 26, 2023          
Senior Unsecured Notes Due 2019 [Member]                
Debt Instrument [Line Items]                
Senior unsecured notes     $ 343 360        
Interest Rate     3.25%          
Maturity Date     Oct. 15, 2019          
Senior Unsecured Notes Due 2025 [Member]                
Debt Instrument [Line Items]                
Senior unsecured notes     $ 343 359        
Long-term Debt, Gross | €             € 300  
Percentage of Face             99.81%  
Interest Rate     1.25%          
Maturity Date     Dec. 11, 2025          
Senior Unsecured Notes Due 2027 [Member]                
Debt Instrument [Line Items]                
Senior unsecured notes     $ 568 $ 0        
Long-term Debt, Gross | €           € 500    
Percentage of Face           99.231%    
Interest Rate     2.125%          
Maturity Date     Mar. 01, 2027          
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Repayments of Lines of Credit   $ 411 $ 997          
Senior Unsecured Term Loan Due 2021 [Member]                
Debt Instrument [Line Items]                
Repayments of Lines of Credit $ 463              
[1] Includes $2 million and $1 million related to the senior secured credit facilities and the pollution control and industrial revenue bonds, respectively, which are included in Refinancing expense in the consolidated statement of operations during the year ended December 31, 2016.