Assets and liabilities related to contracts with customers - Schedule of Movement in Deferred Income Recognised by the Group (Detail) - EUR (€) € in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|||
| Disclosure Of Deferred Income [Abstract] | ||||
| Beginning balance, Non-current | € 338 | € 337 | ||
| Business combination, Non-current | 322 | |||
| Other movements | [1] | (110) | (12) | |
| Impact of currency translation | (28) | 13 | ||
| Ending Balance, Non-current | 522 | 338 | ||
| Beginning balance, Current | 225 | 224 | ||
| Business combination, Current | 130 | |||
| Revenue recognized during the year | (2,057) | (1,884) | ||
| New billings | 2,006 | 1,810 | ||
| Other movements | [1] | 12 | 70 | |
| Impact of currency translation | (13) | 5 | ||
| Ending Balance, Current | € 303 | € 225 | ||
| ||||