Employee benefit obligations - Schedule of defined benefit plans (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of defined benefit plans [line items] | ||
| Employee Benefit Obligations | € 46 | € 14 |
| Defined pension benefits [Member] | ||
| Disclosure of defined benefit plans [line items] | ||
| Employee Benefit Obligations | 18 | 0 |
| Post-employment medical benefits [Member] | ||
| Disclosure of defined benefit plans [line items] | ||
| Employee Benefit Obligations | 23 | 7 |
| Defined contribution plans [Member] | ||
| Disclosure of defined benefit plans [line items] | ||
| Employee Benefit Obligations | 5 | 7 |
| Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control [member] | ||
| Disclosure of defined benefit plans [line items] | ||
| Employee benefit obligations, Non-current | 45 | 14 |
| Employee benefit obligations, Current | € 1 | € 0 |