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REVENUE - Disaggregation of Revenue by Destination of Shipment (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | € 7,239 | € 8,120 | € 6,152
Germany |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 1,671 | 2,036 | 1,481
France |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 642 | 691 | 466
United Kingdom |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 249 | 221 | 179
Switzerland |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 68 | 87 | 63
Spain |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 325 | 302 | 252
Czech Republic |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 213 | 237 | 172
Other Europe |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 901 | 1,110 | 809
Total Europe |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 4,069 | 4,684 | 3,422
United States |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 2,532 | 2,823 | 2,335
Asia and Other Pacific |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | 245 | 252 | 171
All Other |  |  |
Disclosure of geographical areas [line items] |  |  |
Total Revenue by product line | € 393 | € 361 | € 224

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard -URIDate 2023-03-23 + Details
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