v3.25.4
Financial assets at fair value through profit or loss - Summary of exposure to (reverse) repurchase agreements (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss € 133,157 € 137,580
Financial liabilities at fair value through profit or loss 80,532 86,900
Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 80,746 79,675
Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 46,755 43,723
Financial liabilities designated as at fair value through profit or loss | Deposits from banks | Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 330 33
Financial liabilities designated as at fair value through profit or loss | Customer deposits | Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 182 1
Financial liabilities designated as at fair value through profit or loss | Funds entrusted designated and measured at fair value through profit or loss | Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 46,211 38,420
Trading liabilities, funds on deposit | Trading liabilities, funds on deposit | Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 31 5,269
Loans and receivables mandatorily measured at fair value through profit or loss    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 74,352 68,782
Loans and receivables mandatorily measured at fair value through profit or loss | Loans and advances to banks | Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 6,836 10,777
Loans and receivables mandatorily measured at fair value through profit or loss | Loans and advances to customers | Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 3,866 3,471
Trading assets, loans and receivables | Trading assets, loans and receivables | Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 1,574 12,033
Financial assets mandatorily at FVPL | Loans and receivables mandatorily measured at fair value through profit or loss | Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss € 68,469 € 53,393