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Trade and other payables (Details Textual) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Adjustments for increase (decrease) in trade and other payables € 642 € 284 € 1,495
Trade and other payables 16,902 16,793  
Other current liabilities 3,980 € 1,515  
Euro [Member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Trade and other payables 6,484    
Us Dollar [Member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Trade and other payables 9,403    
Increase (decrease) due to application of IFRS 15 [member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Adjustments for increase (decrease) in trade and other payables 113    
Exploration & Production [Member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Other current liabilities 1,004    
Exploration & Production [Member] | Reclassification to other current liabilities IFRS 15 [Member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Other current liabilities € 785