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Fair value of assets and liabilities - Methods applied in determining fair values of financial assets and liabilities (carried at fair value) (Detail) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss € 123,015 € 113,766
Financial assets at fair value through other comprehensive income 41,116 31,625
Financial liabilities at fair value through profit or loss 94,638 93,019
Debt Securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 8,770 6,619
Deposits    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 57,076 50,257
Trading securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 3,645 2,226
Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 25,148 33,917
Loans and receivables    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 67,446 56,644
Financial assets at fair value through other comprehensive income 951 643
Equity securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 15,590 11,941
Financial assets at fair value through other comprehensive income 1,885 1,887
Debt securities and structure notes    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 12,270 10,447
Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through other comprehensive income 38,281 29,095
Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 27,708 34,734
Level 1    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 20,302 13,441
Financial assets at fair value through other comprehensive income 37,470 27,284
Financial liabilities at fair value through profit or loss 4,733 2,814
Level 1 | Debt Securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 1,088 822
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 3,604 1,952
Level 1 | Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 41 40
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 15,438 11,783
Financial assets at fair value through other comprehensive income 1,622 1,639
Level 1 | Debt securities and structure notes    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 4,825 1,636
Level 1 | Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through other comprehensive income 35,848 25,644
Level 1 | Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 39 22
Level 2    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 94,533 93,690
Financial assets at fair value through other comprehensive income 2,707 3,451
Financial liabilities at fair value through profit or loss 89,175 89,473
Level 2 | Debt Securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 7,635 5,743
Level 2 | Deposits    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 57,063 50,257
Level 2 | Trading securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 41 273
Level 2 | Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 24,437 33,200
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 63,316 54,097
Financial assets at fair value through other comprehensive income 275 0
Level 2 | Equity securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 3 2
Financial assets at fair value through other comprehensive income 0 0
Level 2 | Debt securities and structure notes    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 4,081 5,361
Level 2 | Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through other comprehensive income 2,433 3,451
Level 2 | Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 27,134 34,229
Level 3    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 8,179 6,635
Financial assets at fair value through other comprehensive income 938 891
Financial liabilities at fair value through profit or loss 729 732
Level 3 | Debt Securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 47 53
Level 3 | Deposits    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 13 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 0 1
Level 3 | Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial liabilities at fair value through profit or loss 670 678
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 4,131 2,547
Financial assets at fair value through other comprehensive income 676 643
Level 3 | Equity securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 150 156
Financial assets at fair value through other comprehensive income 263 247
Level 3 | Debt securities and structure notes    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 3,364 3,450
Level 3 | Debt securities    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss 3,364 3,447
Financial assets at fair value through other comprehensive income 0 0
Financial liabilities at fair value through profit or loss 0 1
Level 3 | Derivatives    
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Financial assets at fair value through profit or loss € 535 € 483