Other Assets and Receivables - Summary of Movements in the Expected Credit Losses (Detail) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure Of Other Assets And Receivables [abstract] | ||
| Beginning balance | € (18) | € (18) |
| Expected credit losses | (6) | (9) |
| Other movements | 7 | 1 |
| Ending balance | € (17) | € (18) |