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Deferred tax liabilities (Details Textual) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax liability (asset) € 4,269 € 4,286  
Net deferred tax liabilities 1,822 2,877 € 3,572
Deferred tax liabilities, net 5,900 6,667  
Carry-forward tax losses indefinitely 13,545    
Deferred tax assets 4,078 3,790  
Provision for impairments deferred tax assets 5,262 5,622 € 5,099
Carry-forward tax losses 17,773    
Deductions deferred tax liabilities, net 404 (532)  
Deferred tax assets impairment 115    
Unused Tax Losses [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets 2,421 € 2,819  
Fair Value Measurement Of Derivatives Designated As Cash Flow Hedge [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax liabilities, net 57    
Revaluation Of Defined Benefit Plans [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets 19    
Italian Companies [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Provision for impairments deferred tax assets 3,947    
Carry-forward tax losses 10,097    
Foreign Companies [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Provision for impairments deferred tax assets 1,315    
Carry-forward tax losses € 7,676    
Italian subsidiaries [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Average effective tax rate 24.00%    
Foreign subsidiaries [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Average effective tax rate 36.70%