Capital and funding - Disclosure of Currency Retranslation Gains (Losses) (Details) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Equity and liabilities [abstract] | ||
| Currency retranslation gains/(losses) at beginning of period | € (5,955) | € (7,344) |
| Other reserves | (1,258) | 406 |
| Retained profit | (76) | 891 |
| Non-controlling interest | (349) | 92 |
| Currency retranslation gains/(losses) at end of period | € (7,638) | € (5,955) |