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Debt Debt (Senior Notes Narrative) (Details)
€ in Millions, $ in Millions
12 Months Ended
Sep. 26, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
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   $ 0 $ 3 [1] $ 0    
Senior Unsecured Notes Due 2023 [Member]            
Debt Instrument [Line Items]            
Senior unsecured notes   $ 897 788      
Debt Instrument, Redemption Price, Percentage   100.00%        
Long-term Debt, Gross | €           € 750
Percentage of Face           99.713%
Interest Rate   1.125%        
Senior Unsecured Notes Due 2019 [Member]            
Debt Instrument [Line Items]            
Senior unsecured notes   $ 360 316      
Interest Rate   3.25%        
Senior Unsecured Notes Due 2025 [Member]            
Debt Instrument [Line Items]            
Senior unsecured notes   $ 359 $ 0      
Debt Instrument, Redemption Price, Percentage   100.00%        
Long-term Debt, Gross | €         € 300  
Percentage of Face         99.81%  
Interest Rate   1.25%        
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Repayments of Lines of Credit $ 411 $ 431        
[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.