v3.25.4
Note 23 Liabilities Under Insurance Contracts And Reinsurance Contracts Issued (Details) - EUR (€)
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts € 12,760,000,000 € 10,981,000,000 € 12,110,000,000 € 10,131,000,000
Insurance contracts issued [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts 12,760,000,000 10,981,000,000 12,110,000,000  
Liabilities for remaining coverage [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts 11,456,000,000 9,835,000,000 10,900,000,000  
Liabilities for remaining coverage [Member] | Estimates of present value of future cash flows [member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts 9,950,000,000 8,462,000,000 9,516,000,000  
Liabilities for remaining coverage [Member] | Risk adjustment for non-financial risk [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts 142,000,000 150,000,000 171,000,000  
Liabilities for remaining coverage [Member] | Contractual service margin [member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts 1,364,000,000 1,224,000,000 1,213,000,000  
Liabilities for incurred claims [member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts 1,304,000,000 1,146,000,000 1,210,000,000  
Liabilities for incurred claims [member] | Estimates of present value of future cash flows [member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts 1,282,000,000 1,129,000,000 1,191,000,000  
Liabilities for incurred claims [member] | Risk adjustment for non-financial risk [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts 22,000,000 17,000,000 19,000,000  
Reinsurances [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Liabilities covered by insurance and reinsurance contracts € 0 € 0 € 0