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Revenues (Details Textual)
€ in Millions
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
EUR (€)
Disclosure Of Additional Information Explanatory [Line Items]        
Gain on sale of assets and businesses € 454 € 3,288   € 14
Zohr project [Member]        
Disclosure Of Additional Information Explanatory [Line Items]        
Sale of stake in assets and business € 428 € 1,281    
Percentage of sale of stake in assets and business 10 40 40  
Area 4 Mozambique [Member]        
Disclosure Of Additional Information Explanatory [Line Items]        
Gain on sale of assets and businesses | $     $ 1,985  
Proportion of owner interest sold   25.00% 25.00%