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BORROWINGS - Borrowings by Nature (Details) |  |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 02, 2021 EUR (€) target | Feb. 24, 2021 EUR (€) target | Jun. 30, 2021 EUR (€) | Jun. 30, 2020 EUR (€) | Dec. 31, 2020 EUR (€) | Jun. 30, 2021 USD ($) | Jun. 30, 2021 CHF (SFr) | Jun. 02, 2021 USD ($) target | Feb. 24, 2021 USD ($) target | Dec. 31, 2019 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | € 2,260,000,000 |  |  |  |  |  |  |
Gross lease liabilities |  |  | 186,000,000 |  |  |  |  |  |  |
Arrangement fees |  |  | (27,000,000) |  |  |  |  |  |  |
Accrued interests |  |  | 24,000,000 |  |  |  |  |  |  |
Accrued interest lease liabilities |  |  | 1,000,000 |  |  |  |  |  |  |
Total Borrowings |  |  | 2,257,000,000 |  | € 2,391,000,000 |  |  |  |  | € 2,361,000,000
Lease liabilities |  |  | 187,000,000 |  | 195,000,000 |  |  |  |  |
Non-current borrowings |  |  | 1,995,000,000 |  | 2,299,000,000 |  |  |  |  |
Current borrowings |  |  | 262,000,000 |  | 92,000,000 |  |  |  |  |
Repurchase of senior notes |  |  | 863,000,000 | € 200,000,000 | 200,000,000 |  |  |  |  |
Secured Pan-U.S. ABL (due 2026) |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Borrowings |  |  | 0 |  | 0 |  |  |  |  |
Secured U.S. DDTL (due 2022) |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Borrowings |  |  | 0 |  | 0 |  |  |  |  |
Secured French PGE French Facility (due 2022) |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | 180,000,000 |  |  | $ 180,000,000 |  |  |  |
Arrangement fees |  |  | 0 |  |  |  |  |  |  |
Accrued interests |  |  | 0 |  |  |  |  |  |  |
Total Borrowings |  |  | € 180,000,000 |  | 180,000,000 |  |  |  |  |
Secured German Facility (due 2022) |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal rate |  |  | 2.00% |  |  |  |  |  |  |
Total Borrowings |  |  | € 0 |  | 0 |  |  |  |  |
Secured Inventory Facility (due 2023) |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Borrowings |  |  | 0 |  | 0 |  |  |  |  |
Senior Unsecured Notes due 2024 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | € 0 |  |  | 400,000,000 |  |  |  |
Nominal rate | 5.75% |  | 5.75% |  |  |  |  |  |  |
Arrangement fees |  |  | € 0 |  |  |  |  |  |  |
Accrued interests |  |  | 0 |  |  |  |  |  |  |
Total Borrowings |  |  | 0 |  | 325,000,000 |  |  |  |  |
Repurchase of senior notes | € 400,000,000 |  |  |  |  |  |  |  |  |
Senior Unsecured Notes due 2025 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | € 0 |  |  | 650,000,000 |  |  |  |
Nominal rate |  | 6.625% | 6.625% |  |  |  |  |  |  |
Arrangement fees |  |  | € 0 |  |  |  |  |  |  |
Accrued interests |  |  | 0 |  |  |  |  |  |  |
Total Borrowings |  |  | 0 |  | 534,000,000 |  |  |  |  |
Repurchase of senior notes |  | € 650,000,000 |  |  |  |  |  |  |  |
Senior Unsecured Notes due 2026 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | € 421,000,000 |  |  | 500,000,000 |  |  |  |
Nominal rate |  |  | 5.875% |  |  |  |  |  |  |
Arrangement fees |  |  | € (5,000,000) |  |  |  |  |  |  |
Accrued interests |  |  | 9,000,000 |  |  |  |  |  |  |
Total Borrowings |  |  | 425,000,000 |  | 411,000,000 |  |  |  |  |
Senior Unsecured Note due 2026 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | € 400,000,000 |  |  |  |  |  |  |
Nominal rate |  |  | 4.25% |  |  |  |  |  |  |
Arrangement fees |  |  | € (4,000,000) |  |  |  |  |  |  |
Accrued interests |  |  | 6,000,000 |  |  |  |  |  |  |
Total Borrowings |  |  | 402,000,000 |  | 401,000,000 |  |  |  |  |
Senior Unscured Notes due 2028 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | € 274,000,000 |  |  | 325,000,000 |  |  |  |
Nominal rate |  |  | 5.625% |  |  |  |  |  |  |
Arrangement fees |  |  | € (6,000,000) |  |  |  |  |  |  |
Accrued interests |  |  | 1,000,000 |  |  |  |  |  |  |
Total Borrowings |  |  | 269,000,000 |  | 260,000,000 |  |  |  |  |
Sustainability-Linked Senior Notes Issued February 2021 Due 2029 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | € 421,000,000 |  |  | 500,000,000 |  |  | $ 500,000,000 |
Nominal rate |  | 3.75% | 3.75% |  |  |  |  |  |  |
Arrangement fees |  | € (7,000,000) | € (7,000,000) |  |  |  |  |  |  |
Accrued interests |  |  | 5,000,000 |  |  |  |  |  |  |
Total Borrowings |  |  | 419,000,000 |  | 0 |  |  |  |  |
Number of sustainability performance targets | target |  | 2 |  |  |  |  |  |  | 2 |
Sustainability-Linked Senior Notes Issued February 2021 Due 2029 | Starting April 15, 2026 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Increase in nominal rate |  | 0.00125 |  |  |  |  |  |  |  |
Sustainability-Linked Senior Notes Issued February 2021 Due 2029 | Starting April 15, 2027 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Increase in nominal rate |  | 0.00125 |  |  |  |  |  |  |  |
Sustainability-Link Senior Notes Issued June 2021 due 2029 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | € 300,000,000 |  |  | $ 300,000,000 |  | $ 300,000,000 |  |
Nominal rate | 3.125% |  | 3.125% |  |  |  |  |  |  |
Arrangement fees | € (5,000,000) |  | € (5,000,000) |  |  |  |  |  |  |
Accrued interests |  |  | 1,000,000 |  |  |  |  |  |  |
Total Borrowings |  |  | 296,000,000 |  | 0 |  |  |  |  |
Number of sustainability performance targets | target | 2 |  |  |  |  |  |  | 2 |  |
Sustainability-Link Senior Notes Issued June 2021 due 2029 | Starting April 15, 2026 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Increase in nominal rate | 0.00125 |  |  |  |  |  |  |  |  |
Sustainability-Link Senior Notes Issued June 2021 due 2029 | Starting April 15, 2027 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Increase in nominal rate | 0.00125 |  |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility (due 2029) |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Borrowings |  |  | 0 |  | 0 |  |  |  |  |
Unsecured Revolving Credit Facility (due 2029) | BPI France |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  | 2,000,000 |  |  |  |  |  |  |
Unsecured Swiss Facility (due 2025) |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | € 16,000,000 |  |  |  | SFr 17,000,000 |  |  |
Nominal rate |  |  | 1.175% |  |  |  |  |  |  |
Arrangement fees |  |  | € 0 |  |  |  |  |  |  |
Accrued interests |  |  | 0 |  |  |  |  |  |  |
Total Borrowings |  |  | € 16,000,000 |  | 18,000,000 |  |  |  |  |
Unsecured German Facilities (due 2022) |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal rate |  |  | 2.12% |  |  |  |  |  |  |
Total Borrowings |  |  | € 0 |  | 0 |  |  |  |  |
Other loans |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Nominal value |  |  | 62,000,000 |  |  |  |  |  |  |
Arrangement fees |  |  | 0 |  |  |  |  |  |  |
Accrued interests |  |  | 1,000,000 |  |  |  |  |  |  |
Total Borrowings |  |  | 63,000,000 |  | € 67,000,000 |  |  |  |  |
Financing Arrangements |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Borrowings |  |  | € 42,000,000 |  |  |  |  |  |  |

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