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Other liabilities (Details Textual) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Other Current Liabilities Explanatory [Line Items]    
Current advances received € 545
Other current liabilities 3,980 1,515
Non-current deposits from customers 268 255
Non-current liabilities 38,859 42,027
Other non-current payables 155 45
Current accrued expenses and other current liabilities 1,626  
Other Miscellaneous liabilities Non Current 518  
Long Term Agreement For Supplying Natural Gas And Electricity 66  
Reclassification to other current liabilities IFRS 15 [Member]    
Disclosure Of Other Current Liabilities Explanatory [Line Items]    
Other current payables   € (785)
Exploration & Production [Member]    
Disclosure Of Other Current Liabilities Explanatory [Line Items]    
Other current liabilities 1,004  
Exploration & Production [Member] | Reclassification to other current liabilities IFRS 15 [Member]    
Disclosure Of Other Current Liabilities Explanatory [Line Items]    
Other current liabilities 785  
Other current payables € 785