Borrowings - Summary of Borrowings (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of detailed information about borrowings [Line Items] | ||
| Borrowings | € 1,982 | € 3,013 |
| Current | 10 | 37 |
| Non-current | 1,972 | 2,976 |
| Fair value of borrowings | 2,059 | 3,076 |
| Capital funding [member] | ||
| Disclosure of detailed information about borrowings [Line Items] | ||
| Borrowings | 1,396 | 1,533 |
| Operational funding [member] | ||
| Disclosure of detailed information about borrowings [Line Items] | ||
| Borrowings | € 586 | € 1,480 |