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Note 22 Liabilities under insurance and reinsurance contracts (Details) - EUR (€)
€ in Millions
Jun. 30, 2023
Dec. 31, 2022
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Insurance contracts issued that are liabilities € 11,537 € 10,131
Liabilities for remaining coverage [Member]    
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Insurance contracts issued that are liabilities 10,460 9,157
Liabilities for incurred claims [member]    
Disclosure of liabilities under insurance contracts and reinsurance contracts [Line Items]    
Insurance contracts issued that are liabilities € 1,078 € 974