Related Party Transactions (Detail: Text Values) - EUR (€) € in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Related party transactions [abstract] | ||
| Key management loans and commitments | € 11 | € 2 |
| Key management deposits | 15 | 8 |
| Loans past due from transactions with subsidiaries, joint ventures and associates | 0 | 0 |
| Collateral held for loans outstanding | 0 | 0 |
| Trading assets and positive market values from derivative financial transactions with associated companies | 13 | 17 |
| Other assets related to transactions with associated companies | 1 | 2 |
| Other liabilities related to transactions with associated companies | € 4 | € 4 |