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Risk management - Additional information (Details) - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2027 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Global GDP increase |  |  | 2.00% |  |  |
Global GDP rate assumed |  |  | 2.40% |  |  |
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 |  |
Unweighted ECL for all collective provisioned clients in upside scenario |  |  | 2,911 |  |  |
Unweighted ECL for all collective provisioned clients in baseline scenario |  |  | 3,179 |  |  |
Unweighted ECL for all collective provisioned clients in down scenario |  |  | 3,887 |  |  |
Total ECL collective assessment |  |  | € 1,474 | 1,328 |  |
Qualitative indicator, days arrears, backstop |  |  | 30 days |  |  |
Upside scenario |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Total ECL collective assessment for performing assets |  |  | € 1,156 |  |  |
Change in average threshold ratio |  |  | (0.50%) |  |  |
Downside scenario |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Total ECL collective assessment for performing assets |  |  | € 2,170 |  |  |
Change in average threshold ratio |  |  | 1.70% |  |  |
GERMANY |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic sector / portfolio based adjustments |  |  | € 9 |  |  |
Australia |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic sector / portfolio based adjustments |  |  | 11 |  |  |
Wholesale Banking |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Commercial Real Estate/ Inflation and interest rate increases |  |  | 18 |  |  |
Climate transition risk |  |  | 25 |  |  |
Retail banking |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Commercial Real Estate/ Inflation and interest rate increases |  |  | 14 |  |  |
Climate transition risk |  |  | € 19 |  |  |
Eurozone |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate |  |  | 0.90% |  |  |
Poland |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate |  |  | 3.20% |  |  |
Turkey |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate |  |  | 2.90% |  |  |
RUSSIAN FEDERATION |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate |  |  | 1.60% |  |  |
CHINA |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate |  |  | 4.50% |  |  |
Australia |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate |  |  | 1.80% |  |  |
Forecast |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Global output percent | 2.40% | 2.10% | 2.00% |  |  |
Global GDP increase |  | 2.10% |  |  |  |
Global GDP rate assumed |  | 2.40% |  |  |  |
Forecast | UNITED STATES |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate | 2.00% | 1.50% | 1.40% |  |  |
Forecast | Eurozone |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate | 1.40% | 1.10% |  |  |  |
Forecast | Poland |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate | 2.80% | 3.40% |  |  |  |
Forecast | Turkey |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate | 3.60% | 3.30% |  |  |  |
Forecast | RUSSIAN FEDERATION |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate | 1.40% | 1.30% |  |  |  |
Forecast | CHINA |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate | 4.10% | 4.10% |  |  |  |
Forecast | Australia |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Economic growth rate | 2.50% | 2.20% |  |  |  |
Excluding all managment adjustments |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Total model ECL |  |  | € 3,267 |  |  |
Gross carrying amount | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | 0 | 0 |  |
Expected credit losses |  |  | € (1,093,934) | (1,048,574) |  | € (1,025,043)
Gross carrying amount | Stage 1 |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Percentage of financial assets |  |  | 91.70% |  | 91.10% |
Gross carrying amount | Stage 1 | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | € 0 | 0 |  |
Expected credit losses |  |  | € (1,003,405) | € (954,943) |  | (937,633)
Gross carrying amount | Stage 2 |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Percentage of financial assets |  |  | 7.10% | 7.60% |  |
Changes in models |  |  | € (2,300) |  |  |
Gross carrying amount | Stage 2 | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | 0 | € 0 |  |
Expected credit losses |  |  | (77,596) | (79,888) |  | (75,454)
Gross carrying amount | Stage 2 | Not credit-impaired | Loans | Lifetime expected credit losses |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Increase (decrease) through net transfers, financial assets |  |  | (10,500) |  |  |
Increase (decrease) through net level three transfers, financial assets |  |  | 7,700 |  |  |
Gross carrying amount | Stage 2 | Not credit-impaired | Other Commitments | Lifetime expected credit losses |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Increase through other commitments |  |  | 1,100 |  |  |
Gross carrying amount | Stage 2 | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Expected credit losses |  |  | € (77,600) | € (79,900) |  |
Gross carrying amount | Stage 3 |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Percentage of financial assets |  |  | 1.20% | 1.30% |  |
Gross carrying amount | Stage 3 | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | € 0 | € 0 |  |
Expected credit losses |  |  | (12,932) | (13,742) |  | (11,956)
Gross carrying amount | Stage 3 | Credit impaired | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Decrease through derecognition and repayments financial assets |  |  | 800 |  |  |
Increase through write-offs and disposals, financial assets |  |  | 1,500 |  |  |
Gross carrying amount | Stage 3 | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | (800) |  |  |
Expected credit losses |  |  | (12,900) | (13,700) |  |
Gross carrying amount | Stage 3 | Loans | Credit impaired | Of which: non-performing |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | (1,500) |  |  |
Provisions |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Expected credit losses |  |  | 5,945 | 6,049 |  |
Increase (decrease) in financial assets |  |  | (612) | (1,194) |  |
Provisions | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | 35 | 20 |  |
Expected credit losses |  |  | 5,945 | 6,049 |  | 5,839
Increase (decrease) in financial assets |  |  | (612) | (1,179) |  |
Provisions | Stage 1 | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | 6 | (8) |  |
Expected credit losses |  |  | 439 | 409 |  | 517
Increase (decrease) in financial assets |  |  | (39) | 102 |  |
Provisions | Stage 2 | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | (17) | 6 |  |
Expected credit losses |  |  | 1,247 | 1,130 |  | 1,435
Increase (decrease) due to sales and repayments, financial assets |  |  | (600) |  |  |
Increase (decrease) in financial assets |  |  | (137) | 297 |  |
Provisions | Stage 3 | Loans |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |
Changes in models |  |  | 47 | 22 |  |
Expected credit losses |  |  | 4,259 | 4,509 |  | € 3,887
Financial assets, increase (decrease) in provisions |  |  | (300) |  |  |
Increase (decrease) in financial assets |  |  | € (436) | € (1,578) |  |

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