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REVENUE - Disaggregation of Revenue by Destination of Shipment (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of geographical areas [line items]      
Total Revenue by product line € 4,883 € 5,907 € 5,686
Germany      
Disclosure of geographical areas [line items]      
Total Revenue by product line 1,014 1,260 1,339
France      
Disclosure of geographical areas [line items]      
Total Revenue by product line 362 563 554
United Kingdom      
Disclosure of geographical areas [line items]      
Total Revenue by product line 192 194 175
Switzerland      
Disclosure of geographical areas [line items]      
Total Revenue by product line 52 68 77
Other Europe      
Disclosure of geographical areas [line items]      
Total Revenue by product line 923 1,078 1,038
Total Europe      
Disclosure of geographical areas [line items]      
Total Revenue by product line 2,543 3,163 3,183
United States      
Disclosure of geographical areas [line items]      
Total Revenue by product line 1,941 2,175 1,897
Asia and Other Pacific      
Disclosure of geographical areas [line items]      
Total Revenue by product line 211 277 300
All Other      
Disclosure of geographical areas [line items]      
Total Revenue by product line € 188 € 292 € 306