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Pensions and Other Post-employment Benefit Obligations - Details of Net Defined Benefit Obligations by Country (Detail) - EUR (€)
€ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligations € 1,091 € 990
Plan assets (419) (380)
Net defined benefit liability 672 610
France [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligations 169 151
Plan assets (3) (3)
Net defined benefit liability 166 148
Germany [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligations 148 136
Plan assets (1) (1)
Net defined benefit liability 147 135
Switzerland [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligations 280 251
Plan assets (194) (178)
Net defined benefit liability 86 73
United States [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligations 493 451
Plan assets (221) (198)
Net defined benefit liability 272 253
Other countries [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligations 1 1
Net defined benefit liability € 1 € 1