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INFORMATION BY GEOGRAPHIC AREA (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment € 1,948 € 1,906 € 2,056
United States      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 811 777  
France      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 653 646  
Germany      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 266 270  
Czech Republic      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 99 97  
Other      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment € 119 € 116