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Risk management - Most important interest rate and credit spread sensitivities at year-end (Detail) - EUR (€) € in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Germany |  |
Market Risk [Line Items] |  |
Reportable ECL | € 525,000 | € 745,000
Netherlands |  |
Market Risk [Line Items] |  |
Reportable ECL | 310,000 | 381,000
USA |  |
Market Risk [Line Items] |  |
Reportable ECL | 165,000 | 221,000
Interest Rate [(BPV) | Euro | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (309) | (334)
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 | (41) |
Interest Rate [(BPV) | US Dollar | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (40) | (79)
Interest Rate [(BPV) | Pound Sterling | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (35) | (95)
Interest Rate [(BPV) | Taiwan Dollar | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL |  | 67
Interest Rate [(BPV) | Japan, Yen | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL |  | 63
Credit Spread (CSO1) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 208 | 437
Credit Spread (CSO1) | Financial Institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 65 | (36)
Credit Spread (CSO1) | 1 (AAA) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 0 | 2
Credit Spread (CSO1) | 1 (AAA) | Financial Institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 0 | (1)
Credit Spread (CSO1) | 2–4 (AA) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 12 | (1)
Credit Spread (CSO1) | 2–4 (AA) | Financial Institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 50 | (7)
Credit Spread (CSO1) | 5–7 (A) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 57 | 154
Credit Spread (CSO1) | 5–7 (A) | Financial Institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 50 | (13)
Credit Spread (CSO1) | 8–10 (BBB) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 106 | 249
Credit Spread (CSO1) | 8–10 (BBB) | Financial Institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 13 | (11)
Credit Spread (CSO1) | 11–13 (BB) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 25 | 7
Credit Spread (CSO1) | 11–13 (BB) | Financial Institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (25) | 7
Credit Spread (CSO1) | 14–16 (B) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 17 | 23
Credit Spread (CSO1) | 14–16 (B) | Financial Institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (4) | (4)
Credit Spread (CSO1) | 17–22 (CCC and NPL) | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (8) | 3
Credit Spread (CSO1) | 17–22 (CCC and NPL) | Financial Institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | (20) | (7)
Credit Spread (CSO1) | Not rated | Corporate | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 0 | 0
Credit Spread (CSO1) | Not rated | Financial Institutions | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 0 | 0
Credit Spread (CSO1) | Germany | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 405 | 87
Credit Spread (CSO1) | Netherlands | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL | 120 | 162
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 | 102
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 |  | 151
Credit Spread (CSO1) | France | Trading portfolios, netting |  |
Market Risk [Line Items] |  |
Reportable ECL |  | € 88

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