Provisions - Schedule of defined benefit obligation expenses recognized in the consolidated income statements, United Kingdom (Details) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of net defined benefit liability (asset) [line items] | |||
| Post-employment benefit expense in profit or loss, defined benefit plans | € 41 | € 45 | € 42 |
| United Kingdom | |||
| Disclosure of net defined benefit liability (asset) [line items] | |||
| Current service cost | 9 | 13 | 14 |
| Interest cost (net) | (31) | (40) | (62) |
| Provisions or reversal of provisions, net | |||
| Cost of services provided | 0 | 0 | 0 |
| Others | 0 | 0 | 0 |
| Post-employment benefit expense in profit or loss, defined benefit plans | € (22) | € (27) | € (48) |