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Restructuring Charges Narrative (Details) - 3 months ended Mar. 31, 2016
€ in Millions, $ in Millions
EUR (€)
USD ($)
USD ($)
Restructuring Cost and Reserve [Line Items]      
Payments for restructuring   $ 41  
ITALY      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, expected cost | € € 241    
Payments for restructuring 209 238  
Employee-related costs | ITALY      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, expected cost 179   $ 204
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   $ 2  
Other exit costs | ITALY      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, expected cost € 37   $ 42