Financial risk management and financial instruments - Summary of Other Long Term Investments (Details) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Disclosure of detailed information about financial instruments [abstract] | |||
| At January 1 | € 61 | € 43 | € 64 |
| Initial recognition of long term investment | 1 | 3 | 3 |
| Changes in fair value recorded in other comprehensive income | 19 | 16 | (25) |
| Changes in fair value recognized in consolidated statement of operations | 1 | 0 | (1) |
| Return of capital | (2) | 0 | 0 |
| Effect of changes in foreign exchange rates | 5 | (1) | 2 |
| At December 31 | € 85 | € 61 | € 43 |