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Provisions for employee benefits (Details Textual) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 1,022 € 868
Estimate of contributions expected to be paid to plan for next annual reporting period 123  
Exploration Production Segment [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 177 60
Foreign defined benefit plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 409 276
Pension Plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 334 184
Other Long Term benefit Plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 207 170
Other Long Term benefit Plans [Member] | Gas fund [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 13 12
Long-term benefit plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 194 158
Deferred monetary incentive plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 120 99
jubilee awards [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 22 28
Long-term incentive plan [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 13 14
Isopensione [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 28  
Foreign Long-term incentive plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 11 17
Defined Plans [Member]    
Statement Line Items [Line Items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 59  
Other long-term plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 11 € 17