Provisions for employee benefits (Details) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure Of Benefit Plans [Line Items] | ||
| Provisions for employee benefits | € 596 | € 681 |
| Other benefit plans | ||
| Disclosure Of Benefit Plans [Line Items] | ||
| Provisions for employee benefits | 252 | 310 |
| Defined benefit plan | ||
| Disclosure Of Benefit Plans [Line Items] | ||
| Provisions for employee benefits | 344 | 371 |
| Italian defined benefit plans | ||
| Disclosure Of Benefit Plans [Line Items] | ||
| Provisions for employee benefits | 143 | 151 |
| Foreign defined benefit plan | ||
| Disclosure Of Benefit Plans [Line Items] | ||
| Provisions for employee benefits | 89 | 108 |
| FISDE and other foreign medical plans | ||
| Disclosure Of Benefit Plans [Line Items] | ||
| Provisions for employee benefits | € 112 | € 112 |