Intangible assets - Additional information (Details) - EUR (€) € in Millions |
1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|---|
Apr. 24, 2026 |
Apr. 30, 2026 |
Jun. 30, 2026 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of detailed information about intangible assets [line items] | |||||||
| Increase (decrease) in goodwill | € 113 | ||||||
| Intangible assets | 1,740 | € 1,740 | € 1,510 | € 1,334 | |||
| Other changes | 69 | € 2 | |||||
| Goodwill | |||||||
| Disclosure of detailed information about intangible assets [line items] | |||||||
| Intangible assets | 588 | 588 | 477 | 476 | |||
| Other changes | 43 | ||||||
| Other | |||||||
| Disclosure of detailed information about intangible assets [line items] | |||||||
| Intangible assets | € 28 | 28 | € 3 | € 3 | |||
| Other changes | € 26 | € 1 | |||||
| Goldman Sachs TFI | |||||||
| Disclosure of detailed information about intangible assets [line items] | |||||||
| Percentage of voting equity interests acquired | 55.00% | 55.00% | |||||
| Remeasurement pre-existing interest | € 25 | ||||||
| Goldman Sachs TFI | Other | |||||||
| Disclosure of detailed information about intangible assets [line items] | |||||||
| Other changes | € 26 | ||||||