v3.26.1
Financial assets at fair value through profit or loss - Summary of exposure to (reverse) repurchase agreements (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss € 160,057 € 133,157
Financial liabilities at fair value through profit or loss 103,313 80,532
Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 107,490 80,746
Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 70,472 46,755
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 3,654 330
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 1,765 182
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 65,041 46,211
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 13 31
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 91,029 74,352
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 15,566 6,836
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 5,107 3,866
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 725 1,574
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 € 86,092 € 68,469