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Derivatives and hedge accounting - Additional information (Details) | 12 Months Ended
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Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€)
- fair value hedges | Euro |  |
Net Interest Income at Risk [Line Items] |  |
Average rate of hedging instrument | 2.08% | 2.76%
- fair value hedges | US Dollar |  |
Net Interest Income at Risk [Line Items] |  |
Average rate of hedging instrument | 4.22% | 3.93%
- fair value hedges | Financial liabilities at fair value through profit or loss |  |
Net Interest Income at Risk [Line Items] |  |
Derivative financial liabilities held for hedging | € 79,000,000 | € 113,000,000
Cash flow hedges | Euro | Average | – Interest rate swaps |  |
Net Interest Income at Risk [Line Items] |  |
Fixed interest rate | 1.79% | 1.26%
Cash flow hedges | US Dollar | – Cross currency swaps |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 1.03 | 0.98
Cash flow hedges | US Dollar | Average | – Interest rate swaps |  |
Net Interest Income at Risk [Line Items] |  |
Fixed interest rate | 3.99% | 4.33%
Cash flow hedges | Polish Zloty | Average | – Interest rate swaps |  |
Net Interest Income at Risk [Line Items] |  |
Fixed interest rate | 4.37% | 4.09%
Cash flow hedges | Australian Dollar | – Cross currency swaps |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 1.52 | 1.58
Cash flow hedges | Australian Dollar | Average | – Interest rate swaps |  |
Net Interest Income at Risk [Line Items] |  |
Fixed interest rate | 3.29% | 2.80%
Cash flow hedges | Financial liabilities at fair value through profit or loss |  |
Net Interest Income at Risk [Line Items] |  |
Derivative financial liabilities held for hedging | € 573,000,000 | € 458,000,000
- hedges of net investments in foreign operations | US Dollar |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 1.08 | 1.08
- hedges of net investments in foreign operations | Polish Zloty |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 4.31 | 4.54
- hedges of net investments in foreign operations | Australian Dollar |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 1.64 | 1.63
- hedges of net investments in foreign operations | Thai Baht |  |
Net Interest Income at Risk [Line Items] |  |
Average foreign exchange rate | 38.00 | 37.65
- hedges of net investments in foreign operations | Financial liabilities at fair value through profit or loss |  |
Net Interest Income at Risk [Line Items] |  |
Derivative financial liabilities held for hedging | € 117,000,000 | € 92,000,000
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 | 617,000,000 | 716,000,000
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 | 158,000,000 | 440,000,000
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 | € 82,000,000 | € 100,000,000

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