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OPERATING SEGMENT INFORMATION - Segment Revenue (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |  |
Revenue | € 6,152 | € 4,883 | € 5,907
P&ARP |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 3,688 | 2,725 | 3,139
A&T |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1,102 | 1,002 | 1,420
AS&I |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1,362 | 1,156 | 1,348
Segment revenue |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 6,223 | 4,926 | 5,962
Segment revenue | P&ARP |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 3,698 | 2,734 | 3,149
Segment revenue | A&T |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1,142 | 1,025 | 1,462
Segment revenue | AS&I |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1,383 | 1,167 | 1,351
Inter-segment elimination |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (71) | (43) | (55)
Inter-segment elimination | P&ARP |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (10) | (9) | (10)
Inter-segment elimination | A&T |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (40) | (23) | (42)
Inter-segment elimination | AS&I |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | € (21) | € (11) | € (3)

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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 2021-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_113_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_114&doctype=Standard -URIDate 2021-03-24 + Details
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