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Trade and other receivables (Details Textual) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Jun. 30, 2019
Jan. 01, 2018
Dec. 31, 2017
Disclosure Of Trade And Other Receivables [Line Items]        
Decrease In Trade Receivables € 662      
Trade receivables       € 10,182
Current receivables from sale of properties € 475      
Interest Percentage In Project 1.71%      
Other Receivables € 300     5,239
Financing Receivables In Currencies Other Than Euro 6,119      
Trade and other current receivables 14,101   € 14,156 15,421
Provision For Doubtful Accounts Increase 427      
Write off Of Trade Receivables 153      
Utilization Allowance Account For Credit Losses Of Trade And Other Receivables 721      
Other current assets 2,258     1,573
Counterparty Risk Mitigation 3,072      
Subsequent Events [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Additionals Receivables From Sale Of Property   € 119    
Trade receivables [member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Trade and other current receivables 7,100      
Reclassification to other current assets IFRS 15 [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Trade and other current receivables 372   € (466)  
Other current assets € 466      
Intererst One [Member] | Zohr project [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Proportion Of Ownership Interest Sold 10.00%      
Intererst Two [Member] | Zohr project [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Proportion Of Ownership Interest Sold 30.00%      
Gas And Power Segment [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Decrease In Trade Receivables € 641      
Allowance Account For Credit Losses Of Trade And Other Receivables At End Of Period 108      
Utilization Allowance Account For Credit Losses Of Trade And Other Receivables 613      
Exploration & Production [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Allowance Account For Credit Losses Of Trade And Other Receivables At End Of Period 291      
Retail Business [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Utilization Allowance Account For Credit Losses Of Trade And Other Receivables 579      
Factoring of receivables [member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Trade receivables 1,769     2,051
Factoring of receivables [member] | Gas And Power Segment [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Trade receivables 1,419      
Factoring of receivables [member] | Refining Marketing and Chemical Segment [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Trade receivables 350      
Nigeria [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Other Receivables 977     1,507
EGYPT        
Disclosure Of Trade And Other Receivables [Line Items]        
Current Receivables From Sale Of Assets 433      
Nigerian National Oil Company [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Receivables Due From Joint Operators 681     713
Allowance Account For Credit Losses Of Trade And Other Receivables At End Of Period € 140      
Kashagan project [Member]        
Disclosure Of Trade And Other Receivables [Line Items]        
Current Receivables From Sale Of Assets       € 153