Capital and funding - Summary of Consolidated Statement of Changes in Equity: Analysis of Other Reserves (Details) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Equity and liabilities [abstract] | |||
| Fair value reserves – see following table | € 332 | € 600 | € 392 |
| Currency retranslation of group companies – see following table | (8,284) | (7,026) | (7,432) |
| Capital redemption reserve | 28 | 25 | 25 |
| Book value of treasury shares – see following table | (36) | (37) | (207) |
| Repurchase of shares | (3,769) | (2,259) | (6,034) |
| Cancellation of PLC shares | 3,770 | 0 | 5,282 |
| Other | (305) | (602) | (544) |
| Other reserves | € (8,264) | € (9,299) | € (8,518) |