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Derivatives and hedge accounting - Additional information (Details)
 12 Months Ended
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