Accounting policies - Non-current assets and liabilities associated with non-current assets held for sale (Details) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of fair value measurement of assets [line items] | ||
| Maximum percentage of appraisal company's total billings to Group | 15.00% | |
| Fair value less costs to sell of non-current assets held for sale exceeding carrying amount | € 551 | € 553 |
| Spain | ||
| Disclosure of fair value measurement of assets [line items] | ||
| Percentage of entity's total non-current assets held for sale | 76.00% |