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INFORMATION BY GEOGRAPHIC AREA (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment € 1,906 € 2,056
United States    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 777 926
France    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 646 656
Germany    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 270 250
Czech Republic    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 97 106
Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment € 116 € 118