v3.25.2
Other disclosures - Summary of fair values of financial assets and liabilities (Details) - EUR (€)
€ in Millions
Jun. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Financial assets held for trading € 234,834 € 230,253
Non-trading financial assets mandatorily at fair value through profit or loss 5,724 6,130
Financial assets designated at fair value through profit or loss 8,791 7,915
Financial assets designated at fair value through other comprehensive income 75,801 89,898
Hedging derivatives (assets) 4,628 5,672
Financial liabilities held for trading 155,682 152,151
Financial liabilities designated at fair value through profit or loss 35,513 36,360
Hedging derivatives (liabilities) 4,431 4,752
Liabilities under insurance contracts 18,343 17,829
Published price quotations in active markets (Level 1)    
Disclosure of detailed information about financial instruments [line items]    
Financial assets held for trading 87,907 88,147
Non-trading financial assets mandatorily at fair value through profit or loss 1,859 2,037
Financial assets designated at fair value through profit or loss 2,813 2,744
Financial assets designated at fair value through other comprehensive income 53,901 67,680
Financial liabilities held for trading 28,026 29,974
Internal models (Levels 2 and 3)    
Disclosure of detailed information about financial instruments [line items]    
Financial assets held for trading 146,927 142,106
Non-trading financial assets mandatorily at fair value through profit or loss 3,865 4,093
Financial assets designated at fair value through profit or loss 5,978 5,171
Financial assets designated at fair value through other comprehensive income 21,900 22,218
Hedging derivatives (assets) 4,628 5,672
Financial liabilities held for trading 127,656 122,177
Financial liabilities designated at fair value through profit or loss 35,513 36,360
Hedging derivatives (liabilities) 4,431 4,752
Liabilities under insurance contracts € 18,343 € 17,829