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OPERATING SEGMENT INFORMATION - Segment Assets (Details) - EUR (€) € in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Disclosure of operating segments [line items] |  |  |  |
Total Assets | € 4,347 | € 4,184 |  |
Deferred income tax assets | 222 | 185 |  |
Cash and cash equivalents | 378 | 184 | € 213 | € 164
Other financial assets | 31 | 29 |  |
Segment revenue |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 3,716 | 3,786 |  |
Segment revenue | P&ARP |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 1,969 | 1,951 |  |
Segment revenue | A&T |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 818 | 856 |  |
Segment revenue | AS&I |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 716 | 703 |  |
Segment revenue | Holdings & Corporate |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Total Assets | 213 | 276 |  |
Unallocated |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Deferred income tax assets | 222 | 185 |  |
Cash and cash equivalents | 378 | 184 |  |
Other financial assets | € 31 | € 29 |  |

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