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Restructuring and Other (Components of Outstanding Restructuring Reserve and Movements) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Reserve [Roll Forward]    
Provision $ 2 $ 0
2015 European Division Actions [Member]    
Restructuring Reserve [Roll Forward]    
Balance at beginning of period 8  
Provision 1  
Payments (5)  
Balance at end of period 4  
Termination Benefits [Member] | 2015 European Division Actions [Member]    
Restructuring Reserve [Roll Forward]    
Balance at beginning of period 8  
Provision 0  
Payments (4)  
Balance at end of period 4  
Other Exit Costs [Member] | 2015 European Division Actions [Member]    
Restructuring Reserve [Roll Forward]    
Balance at beginning of period 0  
Provision 1  
Payments (1)  
Balance at end of period $ 0