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Deferred tax assets and liabilities - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets and liabilities      
Carry-forward tax losses € 25,932    
Carry-forward tax losses indefinitely 19,656    
Deferred tax assets € 8,790 € 8,546  
Tax rate 24.00% 24.00% 24.00%
Accumulated impairment      
Deferred tax assets and liabilities      
Increase (decrease) in deferred tax liability (asset) € (2,434)    
Italy      
Deferred tax assets and liabilities      
Carry-forward tax losses € 14,000    
Tax rate 24.00%    
Italy | Accumulated impairment      
Deferred tax assets and liabilities      
Deferred tax assets € 3,951    
Italy | Unused tax losses      
Deferred tax assets and liabilities      
Deferred tax assets 3,360    
Foreign (outside Italy)      
Deferred tax assets and liabilities      
Carry-forward tax losses € 11,932    
Tax rate 28.40%    
Foreign (outside Italy) | Accumulated impairment      
Deferred tax assets and liabilities      
Deferred tax assets € 2,219    
Foreign (outside Italy) | Unused tax losses      
Deferred tax assets and liabilities      
Deferred tax assets € 3,392