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RELATED PARTIES - Narrative (Details) - EUR (€) € in Millions	1 Months Ended
	May 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 13, 2020
Disclosure of detailed information about borrowings [line items]
Borrowings		€ 1,868	€ 2,056	€ 2,129
Secured French PGE French Facility (due 2022)
Disclosure of detailed information about borrowings [line items]
Extension period	5 years
Secured French PGE French Facility (due 2022) | French Government
Disclosure of detailed information about borrowings [line items]
Borrowings					€ 180
Percentage of borrowings guaranteed					80.00%
Secured French PGE French Facility (due 2022) | French Government | BPI France
Disclosure of detailed information about borrowings [line items]
Borrowings					€ 30

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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