Leases - Schedule Of Maturity Analysis For Non-Derivative Financial Liabilities (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | € 792 | € 55 |
| Lease liabilities [abstract] | ||
| Current | 76 | 19 |
| Non-current | 559 | 32 |
| Add: Lease liabilities—total | 635 | 51 |
| Not later than one year [member] | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | 110 | 19 |
| Later than one year and not later than five years [member] | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | 412 | 28 |
| Later than five years [member] | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | € 270 | € 8 |