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FINANCIAL RISK MANAGEMENT - Narrative (Details) $ in Millions | Jun. 30, 2021 EUR (€) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 EUR (€) | Dec. 31, 2019 EUR (€)
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Disclosure of liquidity risk [line items] |  |  |  |  |  |
Margin requirement | € 63,000,000 |  | € 39,000,000 |  |  |
Revolving credit facilities outstanding availability | 461,000,000 |  |  |  |  |
Liquidity value | 887,000,000 |  |  |  |  |
Cash and cash equivalents | 290,000,000 |  | 439,000,000 |  | € 378,000,000 | € 184,000,000
Undrawn facilities | 597,000,000 |  |  |  |  |
Margin call |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Margin requirement | € 0 |  | € 3,000,000 |  |  |
Derivative classified as cash flow hedge |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Nominal amount hedging instrument | $ |  | $ 305 |  | $ 330 |  |
U.S. Revolving Facility |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Borrowing base | $ |  | 337 |  |  |  |
French Inventory Based Facility |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Borrowing base | $ |  | 82 |  |  |  |
German Facility |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Borrowing base | $ |  | $ 50 |  |  |  |

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