v3.26.1
Other disclosures - Schedule of financial liabilities measured at other than fair value (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of liabilities [line items]        
Other financial liabilities € 36,118 € 39,916 € 40,187  
Carrying amount        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities 1,385,088 1,444,406 1,428,516  
Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 1,387,320 1,443,444 1,423,165  
Other financial liabilities 36,096 39,916 40,187  
Level 1 | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 162,382 170,118 136,109  
Level 2        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 198,377 179,766 166,542  
Level 2 | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 351,595 362,805 389,003  
Level 3        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 1,110 1,352 1,227 € 925
Level 3 | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 873,343 910,521 898,053  
Deposits | Carrying amount        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities 1,072,384 1,126,439 1,125,308  
Deposits | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 1,073,147 1,125,532 1,124,373  
Deposits | Level 1 | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 0 0 0  
Deposits | Level 2 | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 235,998 250,440 263,428  
Deposits | Level 3 | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 837,149 875,092 860,945  
Debt securities | Carrying amount        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities 312,704 317,967 303,208  
Debt securities | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 314,173 317,912 298,792  
Debt securities | Level 1 | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 162,382 170,118 136,109  
Debt securities | Level 2 | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value 115,597 112,365 125,575  
Debt securities | Level 3 | Fair value        
Disclosure of fair value measurement of liabilities [line items]        
Financial liabilities, at fair value € 36,194 € 35,429 € 37,108