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Revenues (Details Textual) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfAdditionalInformationExplanatoryLineItems [Line Items]      
Other Revenue From Compensation For Damages € 9 € 122 € 36
Gain (loss) on sale of assets and business 3,288    
Area 4 [Member]      
DisclosureOfAdditionalInformationExplanatoryLineItems [Line Items]      
Sale of stake in assets and business € 1,985    
Percentage of sale of stake in assets and business 25.00%    
Zohr project [Member]      
DisclosureOfAdditionalInformationExplanatoryLineItems [Line Items]      
Sale of stake in assets and business € 1,281    
Percentage of sale of stake in assets and business 40.00%