v3.26.1
Financial instruments carried at fair value - Financial instruments carried at fair value (Detail) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Financial assets held at fair value:        
Total financial assets held at fair value € 1,526,110 € 1,439,873    
Financial liabilities held at fair value:        
Total liabilities 1,443,774 1,357,588    
Quoted
prices in
active
market
(Level 1) | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 103,039 94,250    
Financial liabilities held at fair value:        
Total liabilities 41,817 37,025    
Quoted
prices in
active
market
(Level 1) | Trading financial liabilities at fair value through profit or loss | Trading Liabilities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 36,277 33,727    
Quoted
prices in
active
market
(Level 1) | Trading financial liabilities at fair value through profit or loss | Trading securities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 36,276 33,727    
Quoted
prices in
active
market
(Level 1) | Trading financial liabilities at fair value through profit or loss | Other Trading Liabilities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 0 0    
Quoted
prices in
active
market
(Level 1) | Trading financial liabilities at fair value through profit or loss | Derivatives | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 4,184 2,770    
Quoted
prices in
active
market
(Level 1) | Financial liabilities designated at fair value through profit or loss | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 938 154    
Quoted
prices in
active
market
(Level 1) | Investment contract liabilities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 0 0    
Quoted
prices in
active
market
(Level 1) | Other financial liabilities at fair value | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 418 375    
Quoted
prices in
active
market
(Level 1) | Trading financial assets at fair value through profit or loss | Trading assets | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 71,176 64,552    
Quoted
prices in
active
market
(Level 1) | Trading financial assets at fair value through profit or loss | Trading securities | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 68,093 62,958    
Quoted
prices in
active
market
(Level 1) | Trading financial assets at fair value through profit or loss | Other trading assets | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 3,083 1,593    
Quoted
prices in
active
market
(Level 1) | Trading financial assets at fair value through profit or loss | Derivatives | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 2,955 1,273    
Quoted
prices in
active
market
(Level 1) | Non-trading financial assets mandatory at fair value through profit or loss | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 1,707 1,570    
Quoted
prices in
active
market
(Level 1) | Financial assets designated at fair value through profit or loss | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 0 0    
Quoted
prices in
active
market
(Level 1) | Financial assets at fair value through other comprehensive income | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 25,609 25,262    
Quoted
prices in
active
market
(Level 1) | Other financial assets at fair value | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 1,592 1,594    
Valuation
technique
observable
parameters
(Level 2) | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 513,621 444,384    
Financial liabilities held at fair value:        
Total liabilities 402,001 335,875    
Valuation
technique
observable
parameters
(Level 2) | Trading financial liabilities at fair value through profit or loss | Trading Liabilities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 11,618 9,127    
Valuation
technique
observable
parameters
(Level 2) | Trading financial liabilities at fair value through profit or loss | Trading securities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 9,547 7,391    
Valuation
technique
observable
parameters
(Level 2) | Trading financial liabilities at fair value through profit or loss | Other Trading Liabilities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 2,071 1,735    
Valuation
technique
observable
parameters
(Level 2) | Trading financial liabilities at fair value through profit or loss | Derivatives | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 250,497 217,119    
Valuation
technique
observable
parameters
(Level 2) | Financial liabilities designated at fair value through profit or loss | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 138,848 109,354    
Valuation
technique
observable
parameters
(Level 2) | Investment contract liabilities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 512 469    
Valuation
technique
observable
parameters
(Level 2) | Other financial liabilities at fair value | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities [1] 526 (193)    
Valuation
technique
observable
parameters
(Level 2) | Trading financial assets at fair value through profit or loss | Trading assets | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 93,621 78,554    
Valuation
technique
observable
parameters
(Level 2) | Trading financial assets at fair value through profit or loss | Trading securities | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 81,646 63,987    
Valuation
technique
observable
parameters
(Level 2) | Trading financial assets at fair value through profit or loss | Other trading assets | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 11,975 14,567    
Valuation
technique
observable
parameters
(Level 2) | Trading financial assets at fair value through profit or loss | Derivatives | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 265,368 233,373    
Valuation
technique
observable
parameters
(Level 2) | Non-trading financial assets mandatory at fair value through profit or loss | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 135,771 117,244    
Valuation
technique
observable
parameters
(Level 2) | Financial assets designated at fair value through profit or loss | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 0 0    
Valuation
technique
observable
parameters
(Level 2) | Financial assets at fair value through other comprehensive income | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 20,240 16,034    
Valuation
technique
observable
parameters
(Level 2) | Other financial assets at fair value | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value [1] (1,378) (821)    
Valuation
technique
unobservable
parameters
(Level 3) | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 26,988 25,764 € 26,148 € 26,281
Financial liabilities held at fair value:        
Total liabilities 10,277 11,547 12,621 13,382
Valuation
technique
unobservable
parameters
(Level 3) | Trading financial liabilities at fair value through profit or loss | Trading Liabilities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 54 25    
Valuation
technique
unobservable
parameters
(Level 3) | Trading financial liabilities at fair value through profit or loss | Trading securities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 22 23 25 26
Valuation
technique
unobservable
parameters
(Level 3) | Trading financial liabilities at fair value through profit or loss | Other Trading Liabilities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 32 2 0 93
Valuation
technique
unobservable
parameters
(Level 3) | Trading financial liabilities at fair value through profit or loss | Derivatives | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 5,489 5,938 7,328 8,707
Valuation
technique
unobservable
parameters
(Level 3) | Financial liabilities designated at fair value through profit or loss | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 4,647 5,547 5,273 4,569
Valuation
technique
unobservable
parameters
(Level 3) | Investment contract liabilities | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 0 0    
Valuation
technique
unobservable
parameters
(Level 3) | Other financial liabilities at fair value | Recurring fair value measurement        
Financial liabilities held at fair value:        
Total liabilities 86 [2] 36 [2] (5) (13)
Valuation
technique
unobservable
parameters
(Level 3) | Trading financial assets at fair value through profit or loss | Trading assets | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 11,792 10,705    
Valuation
technique
unobservable
parameters
(Level 3) | Trading financial assets at fair value through profit or loss | Trading securities | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 4,340 3,635 3,170 2,964
Valuation
technique
unobservable
parameters
(Level 3) | Trading financial assets at fair value through profit or loss | Other trading assets | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 7,452 7,070 5,682 6,184
Valuation
technique
unobservable
parameters
(Level 3) | Trading financial assets at fair value through profit or loss | Derivatives | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 7,570 7,008 8,193 7,933
Valuation
technique
unobservable
parameters
(Level 3) | Non-trading financial assets mandatory at fair value through profit or loss | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 4,912 5,681 5,920 5,805
Valuation
technique
unobservable
parameters
(Level 3) | Financial assets designated at fair value through profit or loss | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 0 0 0 0
Valuation
technique
unobservable
parameters
(Level 3) | Financial assets at fair value through other comprehensive income | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value 2,691 2,348 3,161 3,383
Valuation
technique
unobservable
parameters
(Level 3) | Other financial assets at fair value | Recurring fair value measurement        
Financial assets held at fair value:        
Total financial assets held at fair value € 22 € 22 € 22 € 12
[1] Predominantly relates to derivatives qualifying for hedge accounting
[2] Relates to derivatives, which are embedded in contracts where the host contract is held at amortized cost but for which the embedded derivative is bifurcated and
reported separately. The separated embedded derivatives may have a positive or a negative fair value and classification presented in this table is consistent with the
classification of the host contract