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Related parties - Transactions with associates and joint ventures (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [line items]      
Assets € 1,023,856 € 980,299 € 976,834
Liabilities 970,158 924,671  
Total for all associates      
Disclosure of subsidiaries [line items]      
Assets 142 121  
Liabilities 263 424  
Off-balance sheet commitments 23 20  
Income received 16 10  
Expenses paid 2 3  
Joint ventures      
Disclosure of subsidiaries [line items]      
Assets 0 0  
Liabilities 10 1  
Off-balance sheet commitments 0 0  
Income received 0 0  
Expenses paid € 0 € 0