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Restructuring Charges Narrative (Details)
€ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2015
EUR (€)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Apr. 15, 2015
USD ($)
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring   $ 62    
ITALY        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost | € € 241      
Payments for Restructuring 209 233    
Employee-related costs | ITALY        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 179   $ 199  
Asset impairment costs        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring   0    
Asset impairment costs | ITALY        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost 25   $ 28  
Other exit costs        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring   $ 12    
Other exit costs | ITALY        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost € 37     $ 41