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Net interest income - Summary of net interest income (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Net interest income [abstract]    
Interest income on loans2 € 17,212 € 15,109
Interest income on debt securities at amortised cost 579 411
Interest income on financial assets at fair value through OCI 710 455
Interest income on non-trading derivatives (hedge accounting) 6,564 4,586
Total interest income using effective interest rate method 25,066 20,561
Interest income on financial assets at fair value through profit or loss 3,211 2,226
Interest income on non-trading derivatives (no hedge accounting) 1,602 2,487
Interest income other 49 60
Total other interest income 4,863 4,773
Total interest income 29,929 25,335
Interest expense on deposits3 7,462 5,132
Interest expense on debt securities in issue 2,573 1,732
Interest expense on subordinated loans 353 354
Interest expense on non-trading derivatives (hedge accounting) 7,127 5,092
Interest expense using effective interest rate 17,515 12,310
Interest expense on financial liabilities at fair value through profit or loss 2,843 1,977
Interest expense on non-trading derivatives (no hedge accounting) 1,742 2,787
Interest expense on lease liabilities 14 13
Interest expense other 54 46
Total other interest expense 4,651 4,823
Total interest expense 22,166 17,133
Net interest income 13 7,762 8,202
Negative interest income on liabilities 5 9
Negative interest expense on assets € 0 € 0