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Share-based payments - Narrative (Details) € / shares in Units, € in Thousands, $ in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 7 Months Ended | 12 Months Ended | 130 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 05, 2024 shares | Jul. 11, 2024 shares | May 23, 2024 shares | Mar. 28, 2024 shares | Jan. 02, 2024 shares | Dec. 01, 2023 shares | Sep. 28, 2023 shares | Jul. 11, 2023 USD ($) shares | Mar. 31, 2024 shares | Sep. 30, 2021 € / shares | Dec. 01, 2023 USD ($) shares | Sep. 05, 2024 | Dec. 31, 2024 EUR (€) shares | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2024 shares
BCEs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change of control, minimum percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 530,652
Compensation expenses | € |  |  |  |  |  |  |  |  |  |  |  |  | € 112 | € 112 | € 138 |
BCE except BCE 2014-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions, minimum financing | € |  |  |  |  |  |  |  |  |  |  |  |  | € 100,000 |  |  |
BSAs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change of control, minimum percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 324,446
Compensation expenses | € |  |  |  |  |  |  |  |  |  |  |  |  | € 211 | € 0 | 0 |
BSA-2024-1 and BSA-2024-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  | 77,820 |  |  |  |  |  |  |
AGA 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting service period |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |
M&A transaction, minimum price per share | € / shares |  |  |  |  |  |  |  |  |  | € 100 |  |  |  |  |  |
Compensation expenses | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,026 |
Social taxes related to AGAs | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 205 |
AGA 2021 | Vesting conditions completed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
AGA 2021 | Vesting conditions not completed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |
AGA-2023-1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 1,382,796 |  |  |  |  |  |  |  |
AGA-2023-1 | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 1,382,796 |  |  |  |  |  |  |  |
AGA-2023-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |
AGA-2023-2 | Former Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |
AGA-2023-3 and AGA-2023-4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  | 985,750 |  |  |  |  |  |  |  |  |
AGA-2023-5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  | 132,750 |  |  |  |  |  |  |  |  |  |
AGA-2023-3 , AGA-2023-4 and AGA-2023-5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions, minimum financing | $ |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  |  |  | 1,118,500 |  |  |  |  |
Number of instruments issued subject to non-market performance condition (in shares) |  |  |  |  |  |  |  |  |  |  | 254,250 |  |  |  |  |
AGA-2024-1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  | 1,549,125 |  |  |  |  |  |  |  | 1,549,125 |  |  |
AGA-2024-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  | 22,500 |  |  |  |  |  |  |  |  | 22,500 |  |  |
AGA-2024-3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  | 38,500 |  |  |  |  |  |  |  |  |  | 38,500 |  |  |
AGA-2024-4, AGA-2024-5 and AGA-2024-6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  | 138,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
AGA-2024-7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) | 198,000 |  |  |  |  |  |  |  |  |  |  |  | 198,000 |  |  |
AGA-2024-6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  | 20,000 |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |
AGA-2024-6 | Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  | 20,000 |  |  |  |  |  |  |  |  |  |  |
Tranche 1 | BCEs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Tranche 1 | BSAs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Tranche 1 | AGA-2023-1 | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 212,738 |  |  |  |  |  |  |  |
Tranche 1 | AGA-2023-2 | Former Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |
Tranche 1 | AGA-2023-3 , AGA-2023-4 and AGA-2023-5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Tranche 1 | AGA-2024-1, AGE-2024-2, AGA-2024-3, AGA-2024-4, AGA-2024-5 and AGA-2024-7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Tranche 1 | AGA-2024-6 | Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |
Tranche 2 | BCEs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Vesting percentage per month |  |  |  |  |  |  |  |  |  |  |  |  | 2.0833% |  |  |
Tranche 2 | BSAs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |
Vesting percentage per month |  |  |  |  |  |  |  |  |  |  |  |  | 2.0833% |  |  |
Tranche 2 | AGA-2023-1 | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 638,214 |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Tranche 2 | AGA-2023-2 | Former Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 75,000 |  |  |  |  |  |  |  |
Tranche 2 | AGA-2023-2 | Former Chief Executive Officer | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Tranche 2 | AGA-2023-3 , AGA-2023-4 and AGA-2023-5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Tranche 2 | AGA-2024-1, AGE-2024-2, AGA-2024-3, AGA-2024-4, AGA-2024-5 and AGA-2024-7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Tranche 2 | AGA-2024-6 | Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |
Tranche 3 | AGA-2023-1 | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 212,738 |  |  |  |  |  |  |  |
Tranche 3 | AGA-2023-1 | Chief Executive Officer | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Tranche 3 | AGA-2023-3 , AGA-2023-4 and AGA-2023-5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |
Tranche 3 | AGA-2024-1, AGE-2024-2, AGA-2024-3, AGA-2024-4, AGA-2024-5 and AGA-2024-7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |
Tranche 4 | AGA-2023-1 | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions, minimum financing | $ |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 106,369 |  |  |  |  |  |  |  |
Tranche 4 | AGA-2023-1 | Chief Executive Officer | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Tranche 5 | AGA-2023-1 | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 106,369 |  |  |  |  |  |  |  |
Tranche 5 | AGA-2023-1 | Chief Executive Officer | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Tranche 6 | AGA-2023-1 | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  | 106,368 |  |  |  |  |  |  |  |

X
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