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Risk management - Most important interest rate and credit spread sensitivities at year-end (Detail) - EUR (€) € in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Germany |  |
Market Risk [Line Items] |  |
Reportable ECL | € 548,000 | € 525,000
Netherlands |  |
Market Risk [Line Items] |  |
Reportable ECL | 270,000 | 310,000
USA |  |
Market Risk [Line Items] |  |
Reportable ECL | 113,000 | 165,000
Interest Rate [(BPV) | Euro | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (799) | (309)
Interest Rate [(BPV) | Czech Koruna | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL |  | 71
Interest Rate [(BPV) | Korean Won | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (54) | (41)
Interest Rate [(BPV) | US Dollar | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (198) | (40)
Interest Rate [(BPV) | British Pound | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (189) | (35)
Interest Rate [(BPV) | Philippine Peso | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (54) |
Credit Spread (CSO1) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 162 | 208
Credit Spread (CSO1) | Financial institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (489) | 65
Credit Spread (CSO1) | 1 (AAA) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (2) | 0
Credit Spread (CSO1) | 1 (AAA) | Financial institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (118) | 0
Credit Spread (CSO1) | 2–4 (AA) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (44) | 12
Credit Spread (CSO1) | 2–4 (AA) | Financial institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (27) | 50
Credit Spread (CSO1) | 5–7 (A) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 49 | 57
Credit Spread (CSO1) | 5–7 (A) | Financial institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (246) | 50
Credit Spread (CSO1) | 8–10 (BBB) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 93 | 106
Credit Spread (CSO1) | 8–10 (BBB) | Financial institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (76) | 13
Credit Spread (CSO1) | 11–13 (BB) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 38 | 25
Credit Spread (CSO1) | 11–13 (BB) | Financial institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (13) | (25)
Credit Spread (CSO1) | 14–16 (B) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 23 | 17
Credit Spread (CSO1) | 14–16 (B) | Financial institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (12) | (4)
Credit Spread (CSO1) | 17–22 (CCC and NPL) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 4 | (8)
Credit Spread (CSO1) | 17–22 (CCC and NPL) | Financial institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 2 | (20)
Credit Spread (CSO1) | Germany | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 49 | 405
Credit Spread (CSO1) | Netherlands | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (165) | 120
Credit Spread (CSO1) | Korea | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL |  | (111)
Credit Spread (CSO1) | Japan | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL |  | 106
Credit Spread (CSO1) | United Kingdom | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL |  | € 101
Credit Spread (CSO1) | USA | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 193 |
Credit Spread (CSO1) | France | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (113) |
Credit Spread (CSO1) | Poland | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | € 69 |

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