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Note 22 Liabilities under insurance and reinsurance contracts (Details) - EUR (€)
€ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Liabilities under insurance contracts and reinsurance contracts issued € 11,622 € 10,865
Mathematical reserves [Member]    
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Liabilities under insurance contracts and reinsurance contracts issued 10,033 9,495
Provision for unpaid claims reported [Member]    
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Liabilities under insurance contracts and reinsurance contracts issued 751 706
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 € 839 € 664