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Note 23 Maturity of liabilities under insurance and reinsurance contracts (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows of liabilities under reinsurance and reinsurance contracts Line Items [Line Items]      
Insurance contracts that are liabilities € 10,865 € 9,951 € 10,606
Not later than one year [member]      
Cash flows of liabilities under reinsurance and reinsurance contracts Line Items [Line Items]      
Insurance contracts that are liabilities 1,808 1,227 1,571
Later than one year and not later than three years [member]      
Cash flows of liabilities under reinsurance and reinsurance contracts Line Items [Line Items]      
Insurance contracts that are liabilities 290 950 1,197
Later than three years and not later than five years [member]      
Cash flows of liabilities under reinsurance and reinsurance contracts Line Items [Line Items]      
Insurance contracts that are liabilities 1,664 1,616 1,806
Later than five years [member]      
Cash flows of liabilities under reinsurance and reinsurance contracts Line Items [Line Items]      
Insurance contracts that are liabilities € 7,103 € 6,158 € 6,032