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Other financial assets (Details Textual)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Disclosure Of Financial Assets Explanatory [Line Items]      
Other non-current financial assets € 1,253,000 € 1,675,000 $ 1,675
Securities Pledged As Guarantee Of The Deposit For Gas Cylinders   20,000  
Other current financial assets 300,000 316,000  
Other financial assets 1,301,000 € 1,709,000  
Non-current financial assets at amortised cost 1,188,000    
Gas And Power Segment [Member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Other financial assets 103,000    
Later than five years [member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Other current financial assets € 1,088,000    
Securities Within Five Years Of Maturity [Member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Securities Maturity Period Five years    
Top of range [member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Discount rate applied to cash flow projections   2.90% 2.90%
Discount Rate Unobservable Significant Input 2.50%    
Bottom of range [member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Discount rate applied to cash flow projections   0.20% 0.20%
Discount Rate Unobservable Significant Input 0.20%    
Held to maturity Investments Category [Member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Other non-current financial assets € 64 € 73,000 $ 73
Held to maturity Investments Category [Member] | European Investment Bank Bonds [Member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Other non-current financial assets   4,000  
Securities held for operating purposes [Member] | Sovereign States Bonds [Member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Other non-current financial assets   69,000  
Financing receivables held for operating purposes [Member] | Later than five years [member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Other non-current financial assets   € 1,393,000  
Matrica SpA [Member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Proportion of ownership interest in joint venture   50.00%  
Cardon IV SA 1 [Member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Other non-current financial assets   € 955,000  
Other current financial assets € 705,000    
Joint ventures and associates [Member]      
Disclosure Of Financial Assets Explanatory [Line Items]      
Other non-current financial assets   € 1,075,000