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Derivatives and hedge accounting - Additional information (Details) | 12 Months Ended
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Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
- fair value hedges | Euro |  |
Net Interest Income at Risk [Line Items] |  |
Average rate of hedging instrument | 2.76% | 2.75%
- fair value hedges | US Dollar |  |
Net Interest Income at Risk [Line Items] |  |
Average rate of hedging instrument | 3.93% | 3.86%
- fair value hedges | Hedged item affected statement of profit or loss |  |
Net Interest Income at Risk [Line Items] |  |
Derivative financial liabilities held for hedging | € 113,000,000 | € 244,000,000
Cash flow hedges | Euro | Average |  |
Net Interest Income at Risk [Line Items] |  |
Fixed interest rate | 1.26% | 0.51%
Cash flow hedges | US Dollar | – Cross currency swaps |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 0.98 | 0.99
Cash flow hedges | US Dollar | Average | – Interest rate swaps |  |
Net Interest Income at Risk [Line Items] |  |
Fixed interest rate | 4.33% | 1.96%
Cash flow hedges | Polish Zloty | Average | – Interest rate swaps |  |
Net Interest Income at Risk [Line Items] |  |
Fixed interest rate | 4.09% | 3.27%
Cash flow hedges | Australian Dollar | – Cross currency swaps |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 1.58 | 1.58
Cash flow hedges | Australian Dollar | Average | – Interest rate swaps |  |
Net Interest Income at Risk [Line Items] |  |
Fixed interest rate | 2.80% | 1.28%
Cash flow hedges | Hedged item affected statement of profit or loss |  |
Net Interest Income at Risk [Line Items] |  |
Derivative financial liabilities held for hedging | € 458,000,000 | € 1,275,000,000
- hedges of net investments in foreign operations | US Dollar |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 1.08 | 1.06
- hedges of net investments in foreign operations | Polish Zloty |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 4.54 | 4.68
- hedges of net investments in foreign operations | Australian Dollar |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 1.63 | 1.52
- hedges of net investments in foreign operations | Thai Baht |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 37.65 | 36.87
- hedges of net investments in foreign operations | Hedged item affected statement of profit or loss |  |
Net Interest Income at Risk [Line Items] |  |
Derivative financial liabilities held for hedging | € 92,000,000 | € 83,000,000
Financial assets at fair value through profit or loss | - fair value hedges |  |
Net Interest Income at Risk [Line Items] |  |
Derivative financial assets held for hedging | 716,000,000 | 836,000,000
Financial assets at fair value through profit or loss | Cash flow hedges |  |
Net Interest Income at Risk [Line Items] |  |
Derivative financial assets held for hedging | 440,000,000 | 814,000,000
Financial assets at fair value through profit or loss | - hedges of net investments in foreign operations |  |
Net Interest Income at Risk [Line Items] |  |
Derivative financial assets held for hedging | € 100,000,000 | € 119,000,000

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