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TRADE RECEIVABLES AND OTHER - Narrative (Details) | 6 Months Ended |
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Jun. 30, 2021 EUR (€) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 EUR (€) | Dec. 31, 2020 EUR (€)
Disclosure of trade and other receivables [line items] |  |  |  |
Allowance for impairment on trade receivables recognized | € (400,000) |  | € (400,000) |
Trade receivables | 586,000,000 |  |  | € 341,000,000
Total factored assets | 587,000,000 |  |  | 514,000,000
Factored assets derecognized | 384,000,000 |  |  | 398,000,000
Debt due factor | 1,000,000 |  |  | € 0
Impairment |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Trade receivables | 0 |  | € 0 |
United States | Factoring of receivables | Muscle Shoals factoring facility |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Factoring maximum capacity | $ |  | $ 300,000,000 |  |
United States | Factoring of receivables | Constellium automotive |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Factoring maximum capacity | $ |  | $ 25,000,000 |  |
France | Factoring of receivables |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Factoring maximum capacity | 255,000,000 |  |  |
France | Factoring Receivable, Recourse Line |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Factoring maximum capacity | 20,000,000 |  |  |
Germany, Switzerland and Czech Republic | Factoring of receivables |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Factoring maximum capacity | € 150,000,000 |  |  |

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