Risk management - Management adjustments (Details) - EUR (€) € in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Risk Management [Abstract] | ||
| Commercial Real Estate/ Inflation and interest rate increases | € 32 | € 50 |
| Economic sector / portfolio based adjustments | 20 | 38 |
| Mortgage portfolio adjustments | 112 | 112 |
| Climate transition risk | 44 | 29 |
| Other Post Model Adjustments | 29 | (27) |
| Total management adjustments | € 236 | € 203 |