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Note 23 Liabilities Under Insurance Contracts And Reinsurance Contracts Issued (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
 [1]
Dec. 31, 2021
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities € 10,981 € 12,110 € 10,131 [2] € 9,972
Insurances [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities 10,981 12,110 10,131  
Liabilities for remaining coverage [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities 9,835 10,900 9,157  
Liabilities for remaining coverage [Member] | Estimates of present value of future cash flows [member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities 8,462 9,516 7,905  
Liabilities for remaining coverage [Member] | Risk adjustments [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities 150 171 155  
Liabilities for remaining coverage [Member] | Cost service margin [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities 1,224 1,213 1,097  
Liabilities for incurred claims [member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities 1,146 1,210 974  
Liabilities for incurred claims [member] | Estimates of present value of future cash flows [member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities 1,129 1,191 959  
Liabilities for incurred claims [member] | Risk adjustments [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities 17 19 15  
Reinsurances [Member]        
Liabilities under insurance and reinsurance contracts [Line Items]        
Insurance contracts issued that are liabilities € 0 € 0 € 0  
[1]
(1) Balances corresponding to 2022 have been restated according to IFRS 17 (see Note 1.3).
[2]
(3) Balances corresponding to 2022 have been restated according to IFRS 17 (see Note 1.3).