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Related parties - Transactions with associates and joint ventures (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of subsidiaries [line items]      
Assets € 980,299 € 976,834 € 949,250
Liabilities 924,671 919,829  
Associates      
Disclosure of subsidiaries [line items]      
Assets 121 121  
Liabilities 424 309  
Off-balance sheet commitments 20 28  
Income received 10 12  
Expenses paid 3 0  
Joint ventures      
Disclosure of subsidiaries [line items]      
Assets 0 0  
Liabilities 1 1  
Off-balance sheet commitments 0 0  
Income received 0 0  
Expenses paid € 0 € 0