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Restructuring and Other (Components of Outstanding Restructuring Reserve and Movements) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Reserve [Roll Forward]      
Provisions $ 12 $ 23 $ 21
Termination benefits [Member]      
Restructuring Reserve [Roll Forward]      
Provisions 9 20 8
Other exit costs [Member]      
Restructuring Reserve [Roll Forward]      
Provisions 3 3 $ 13
2015 European Division Actions [Member]      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 17    
Provisions 3    
Payments (9)    
Foreign currency translation (2)    
Releases (1)    
Balance at end of period 8 17  
2015 European Division Actions [Member] | Termination benefits [Member]      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 17    
Provisions 0    
Payments (6)    
Foreign currency translation (2)    
Releases (1)    
Balance at end of period 8 17  
2015 European Division Actions [Member] | Other exit costs [Member]      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 0    
Provisions 3    
Payments (3)    
Foreign currency translation 0    
Releases 0    
Balance at end of period $ 0 $ 0