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OPERATING SEGMENT INFORMATION - Segment Assets (Details) - EUR (€) € in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Disclosure of operating segments [line items] |  |  |  |
Total Assets | € 4,455 | € 4,129 |  |
Deferred tax assets | 162 | 193 |  |
Cash and cash equivalents | 290 | 439 | € 378 | € 184
Segment revenue |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 3,924 | 3,440 |  |
Segment revenue | P&ARP |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 1,983 | 1,733 |  |
Segment revenue | A&T |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 857 | 765 |  |
Segment revenue | AS&I |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 698 | 668 |  |
Segment revenue | H&C |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 386 | 274 |  |
Unallocated |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Deferred tax assets | 162 | 193 |  |
Cash and cash equivalents | 290 | 439 |  |
Other financial assets | € 79 | € 57 |  |

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