v3.26.1
Fair value of assets and liabilities - Methods applied in determining fair values of financial assets and liabilities (carried at fair value) (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss € 160,057 € 133,157
Financial assets at fair value through other comprehensive income 63,043 56,662
Financial liabilities at fair value through profit or loss 103,313 80,532
–  Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 9,763 8,839
–  Deposits    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 66,131 47,120
–  Trading securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 2,267 2,554
- Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 25,152 22,019
Loans and receivables    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 91,029 74,352
Financial assets at fair value through other comprehensive income 3,631 3,238
- Equity securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 27,582 21,583
Financial assets at fair value through other comprehensive income 2,647 2,607
- Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 13,484 11,219
Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through other comprehensive income 56,765 50,817
- Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 27,963 26,003
Level 1    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 34,995 27,937
Financial assets at fair value through other comprehensive income 58,288 51,829
Financial liabilities at fair value through profit or loss 3,911 4,226
Level 1 | –  Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 1,621 1,540
Level 1 | –  Deposits    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 0 0
Level 1 | –  Trading securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 2,210 2,534
Level 1 | - Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 80 152
Level 1 | Loans and receivables    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 0 0
Financial assets at fair value through other comprehensive income 0 0
Level 1 | - Equity securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 27,423 21,392
Financial assets at fair value through other comprehensive income 2,322 2,301
Level 1 | - Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 7,562 6,492
Level 1 | Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through other comprehensive income 55,966 49,529
Level 1 | - Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 11 52
Level 2    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 114,559 93,785
Financial assets at fair value through other comprehensive income 4,404 4,526
Financial liabilities at fair value through profit or loss 98,326 75,505
Level 2 | –  Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 7,932 7,284
Level 2 | –  Deposits    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 66,131 47,120
Level 2 | –  Trading securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 48 11
Level 2 | - Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 24,214 21,090
Level 2 | Loans and receivables    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 83,257 65,811
Financial assets at fair value through other comprehensive income 3,606 3,238
Level 2 | - Equity securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 4 4
Financial assets at fair value through other comprehensive income 0 0
Level 2 | - Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 4,040 2,793
Level 2 | Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through other comprehensive income 798 1,288
Level 2 | - Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 27,258 25,178
Level 3    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 10,503 11,435
Financial assets at fair value through other comprehensive income 350 307
Financial liabilities at fair value through profit or loss 1,076 802
Level 3 | –  Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 209 15
Level 3 | –  Deposits    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 0 0
Level 3 | –  Trading securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 9 9
Level 3 | - Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 857 777
Level 3 | Loans and receivables    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 7,772 8,542
Financial assets at fair value through other comprehensive income 25 0
Level 3 | - Equity securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 155 187
Financial assets at fair value through other comprehensive income 325 307
Level 3 | - Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 1,883 1,934
Level 3 | Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through other comprehensive income 0 0
Level 3 | - Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss € 694 € 773