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Net interest income - Summary of net interest income (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net interest income [abstract]      
Interest income on loans € 32,002 € 18,440 € 13,914
Interest income on financial assets at fair value through OCI 1,078 511 346
Interest income on debt securities at amortised cost 877 591 468
Interest income on non-trading derivatives (hedge accounting) 10,682 4,011 2,361
Negative interest on liabilities 19 887 1,487
Total interest income using effective interest rate method 44,658 24,439 18,577
Interest income on financial assets at fair value through profit or loss 4,934 1,444 435
Interest income on non-trading derivatives (no hedge accounting) 2,637 2,390 2,025
Interest income other 171 100 14
Total other interest income 7,741 3,934 2,474
Total interest income 52,399 28,373 21,051
Interest expense on deposits from banks 1,555 420 109
Interest expense on customer deposits 10,385 2,800 915
Interest expense on debt securities in issue 4,014 1,722 1,218
Interest expense on subordinated loans 708 648 571
Negative interest on assets 0 285 572
Interest expense on non-trading derivatives (hedge accounting) 11,849 4,144 1,700
Total interest expense using effective interest rate method 28,510 10,019 5,085
Interest expense on financial liabilities at fair value through profit or loss 4,410 1,237 304
Interest expense on non-trading derivatives (no hedge accounting) 3,131 2,411 1,605
Interest expense on lease liabilities 28 15 14
Interest expense other 157 98 43
Total other interest expense 7,726 3,762 1,966
Total interest expense 36,237 13,780 7,051
Net interest income € 16,162 € 14,593 € 14,000