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Restructuring Charges (Narrative) (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
EUR (€)
position
Dec. 31, 2018
USD ($)
position
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]        
Expected reduction in overhead costs       $ 150
Italy        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost € 241   $ 276  
Estimated payments for restructuring 209 $ 240    
Restructuring and related cost, expected cost remaining 10   11  
Italy | Employee severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 179   205  
Italy | Asset impairment costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 25   29  
Italy | Other exit costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 37   42  
United Kingdom        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 80   92  
Estimated payments for restructuring 69 $ 79    
Restructuring and related cost, expected cost remaining € 3   4  
Restructuring, number of positions anticipated to be affected | position 500 500    
United Kingdom | Employee severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost € 59   68  
United Kingdom | Asset impairment costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 11   13  
United Kingdom | Other exit costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 10   11  
EMEA        
Restructuring Cost and Reserve [Line Items]        
Expected reduction in overhead costs     50  
EMEA | Employee severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 56   64  
EMEA | Asset impairment costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 6   7  
EMEA | Other exit costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost € 11   $ 13