Debt - Lease liabilities (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Debt [Line Items] | ||
| Future minimum lease payments | € 1,101 | € 1,232 |
| Interest | 137 | 159 |
| Present value of minimum lease payments | 963 | 1,073 |
| Less than one year | ||
| Debt [Line Items] | ||
| Future minimum lease payments | 241 | 255 |
| Interest | 34 | 35 |
| Present value of minimum lease payments | 207 | 219 |
| Between one and five years | ||
| Debt [Line Items] | ||
| Future minimum lease payments | 556 | 592 |
| Interest | 76 | 85 |
| Present value of minimum lease payments | 479 | 506 |
| Amount due after 5 years | ||
| Debt [Line Items] | ||
| Future minimum lease payments | 304 | 385 |
| Interest | 27 | 38 |
| Present value of minimum lease payments | € 277 | € 347 |