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Note 22 Liabilities Under Insurance Contracts And Reinsurance Contracts Issued (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Liabilities under insurance contracts and reinsurance contracts issued € 10,535,000,000 € 9,951,000,000
Mathematical reserves member [Member]    
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Liabilities under insurance contracts and reinsurance contracts issued 9,184,000,000 8,731,000,000
Provision for upaid claims reported member [Member]    
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Liabilities under insurance contracts and reinsurance contracts issued 694,000,000 672,000,000
Provisions for unexpired risks and other provisions [Member]    
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Liabilities under insurance contracts and reinsurance contracts issued € 657,000,000 € 548,000,000