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Pensions and Other Post-employment Benefit Obligations - Details of Net Defined Benefit Obligations by Country (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations € 990 € 1,051  
Plan assets (380) (387)  
Net defined benefit liability 610 664 € 735
France [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 151 148  
Plan assets (3) (3)  
Net defined benefit liability 148 145  
Germany [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 136 142  
Plan assets (1) (1)  
Net defined benefit liability 135 141  
Switzerland [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 251 251  
Plan assets (178) (177)  
Net defined benefit liability 73 74  
United States [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 451 509  
Plan assets (198) (206)  
Net defined benefit liability 253 303  
Other countries [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 1 1  
Net defined benefit liability € 1 € 1