Share premium (Details) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Share Premium [Abstract] | |||
| Decrease in net issue premium | € 3,055 | € 3,778 | € 1,595 |
| Redemption of treasury shares, purchase value | 3,287 | 4,294 | 1,900 |
| Redemption of treasury shares, par value | € 231 | € 516 | € 305 |