Derivatives and hedge accounting - Gross carrying value of derivatives used for cash flow hedge accounting (Details) - - Derivatives - Cash flow hedges - Net payer and receiver swap - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| – Interest rate swaps | ||
| Disclosure of detailed information about hedging instruments [line items] | ||
| Hedging instrument, assets | € 9,414 | € 10,635 |
| Hedging instrument, liabilities | 10,066 | 12,814 |
| – Cross currency swaps | ||
| Disclosure of detailed information about hedging instruments [line items] | ||
| Hedging instrument, assets | 1,042 | 472 |
| Hedging instrument, liabilities | 139 | 339 |
| – Cross currency interest rate swaps | ||
| Disclosure of detailed information about hedging instruments [line items] | ||
| Hedging instrument, assets | 63 | |
| Hedging instrument, liabilities | € 10 |