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Deferred tax assets and liabiities (Details Textual) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Deferred Tax Liabilities [Line Items]    
Carry-forward tax losses indefinitely € 13,753  
Deferred tax assets 3,931 € 4,078
Carry-forward tax losses € 19,108  
Foreign Subsidiaries [Member]    
Disclosure Of Deferred Tax Liabilities [Line Items]    
Average effective tax rate 35.00%  
Italian Companies [Member]    
Disclosure Of Deferred Tax Liabilities [Line Items]    
Carry-forward tax losses € 10,786  
Accumulated write-downs of deferred tax assets 4,133  
Foreign Companies [Member]    
Disclosure Of Deferred Tax Liabilities [Line Items]    
Carry-forward tax losses 8,322  
Accumulated write-downs of deferred tax assets € 1,608  
Italian subsidiaries [Member]    
Disclosure Of Deferred Tax Liabilities [Line Items]    
Average effective tax rate 24.00%  
Unused tax losses [member]    
Disclosure Of Deferred Tax Liabilities [Line Items]    
Deferred tax assets € 2,615 € 2,913