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OPERATING SEGMENT INFORMATION - Narrative (Details) € in Millions | 12 Months Ended
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Dec. 31, 2023 EUR (€) employee country facility | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€)
Disclosure of operating segments [line items] |  |  |
Number of employees | employee | 12,000 |  |
Revenue | € 7,239 | € 8,120 | € 6,152
P&ARP |  |  |
Disclosure of operating segments [line items] |  |  |
Number of facilities | facility | 4 |  |
Number of countries in which entity operates | country | 3 |  |
Number of employees | employee | 4,200 |  |
Revenue | € 3,879 | 4,655 | 3,688
P&ARP | Group's largest customer |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | € 734 | 839 | 692
A&T |  |  |
Disclosure of operating segments [line items] |  |  |
Number of facilities | facility | 5 |  |
Number of countries in which entity operates | country | 3 |  |
Number of employees | employee | 3,400 |  |
Revenue | € 1,714 | 1,645 | 1,102
AS&I |  |  |
Disclosure of operating segments [line items] |  |  |
Number of facilities | facility | 16 |  |
Number of countries in which entity operates | country | 10 |  |
Number of employees | employee | 4,100 |  |
Revenue | € 1,627 | € 1,820 | € 1,362

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