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Pensions and Other Post-employment Benefit Obligations - Additional Information (Detail) - EUR (€)
€ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]        
Increase / decrease in the discount rates     0.50%  
Weighted-average maturity of defined benefit obligations     14 years 13 years 2 months 12 days
Pensions [member]        
Disclosure of defined benefit plans [line items]        
Expected contributions to pension and other benefits   € 25    
Other benefits [member]        
Disclosure of defined benefit plans [line items]        
Expected contributions to pension and other benefits   € 18    
Switzerland [member]        
Disclosure of defined benefit plans [line items]        
Decrease in defined benefit obligation resulting from negative past service cost € (12)      
United States [member]        
Disclosure of defined benefit plans [line items]        
Decrease in defined benefit obligation resulting from negative past service cost     € (8)