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Restructuring Charges - Narrative (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 30, 2016
position
Mar. 31, 2017
EUR (€)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]                
Payments for restructuring     $ 31          
Restructuring costs     46 $ 47        
ITALY                
Restructuring Cost and Reserve [Line Items]                
Restructuring and related cost, expected cost   € 241         $ 257  
Payments for restructuring   209 223          
UNITED KINGDOM                
Restructuring Cost and Reserve [Line Items]                
Restructuring and related cost, expected cost         € 79     $ 85
Payments for restructuring         69 $ 73    
Restructuring and related cost, expected number of positions eliminated | position 500              
Employee-related costs | ITALY                
Restructuring Cost and Reserve [Line Items]                
Restructuring and related cost, expected cost   179         191  
Employee-related costs | UNITED KINGDOM                
Restructuring Cost and Reserve [Line Items]                
Restructuring and related cost, expected cost         59     63
Asset impairment costs                
Restructuring Cost and Reserve [Line Items]                
Payments for restructuring     0          
Restructuring costs     12          
Asset impairment costs | ITALY                
Restructuring Cost and Reserve [Line Items]                
Restructuring and related cost, expected cost   25         27  
Asset impairment costs | UNITED KINGDOM                
Restructuring Cost and Reserve [Line Items]                
Restructuring and related cost, expected cost         11     11
Other exit costs                
Restructuring Cost and Reserve [Line Items]                
Payments for restructuring     1          
Restructuring costs     $ 9          
Other exit costs | ITALY                
Restructuring Cost and Reserve [Line Items]                
Restructuring and related cost, expected cost   € 37         $ 40  
Other exit costs | UNITED KINGDOM                
Restructuring Cost and Reserve [Line Items]                
Restructuring and related cost, expected cost         € 10     $ 11