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Deferred tax assets and liabilities - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets and liabilities      
Carry-forward tax losses € 21,896    
Carry-forward tax losses indefinitely 17,319    
Deferred tax assets € 8,241 € 8,790  
Tax rate 24.00% 24.00% 24.00%
Italy      
Deferred tax assets and liabilities      
Carry-forward tax losses € 12,063    
Deferred tax assets € 538    
Tax rate 24.00%    
Italy | Accumulated impairment      
Deferred tax assets and liabilities      
Deferred tax assets € 3,975    
Italy | Unused tax losses      
Deferred tax assets and liabilities      
Deferred tax assets 2,895    
Foreign (outside Italy)      
Deferred tax assets and liabilities      
Carry-forward tax losses € 9,833    
Tax rate 28.30%    
Foreign (outside Italy) | Accumulated impairment      
Deferred tax assets and liabilities      
Deferred tax assets € 1,693    
Foreign (outside Italy) | Unused tax losses      
Deferred tax assets and liabilities      
Deferred tax assets € 2,782