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Deferred tax assets and liabilities - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets and liabilities      
Carry-forward tax losses € 23,325    
Carry-forward tax losses indefinitely 17,323    
Deferred tax assets € 7,166 € 9,023  
Tax rate 24.00% 24.00% 24.00%
Accumulated impairment      
Deferred tax assets and liabilities      
Deferred tax assets € (9,065) € (6,744)  
Italy      
Deferred tax assets and liabilities      
Carry-forward tax losses € 13,153    
Tax rate 24.00%    
Italy | Accumulated impairment      
Deferred tax assets and liabilities      
Deferred tax assets € (7,090)    
Italy | Unused tax losses      
Deferred tax assets and liabilities      
Deferred tax assets 3,734    
Foreign (outside Italy)      
Deferred tax assets and liabilities      
Carry-forward tax losses € 10,172    
Tax rate 31.90%    
Foreign (outside Italy) | Accumulated impairment      
Deferred tax assets and liabilities      
Deferred tax assets € (1,975)    
Foreign (outside Italy) | Unused tax losses      
Deferred tax assets and liabilities      
Deferred tax assets € 3,249