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Impairment/reversal of tangible and intangible assets (Details Textual)
€ in Millions
12 Months Ended
Dec. 31, 2017
EUR (€)
$ / bbl
Dec. 31, 2016
EUR (€)
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Discount rate used in current measurement of fair value less costs of disposal 0.00%  
Long Term Assumption, Benchmark Brent Price Previous Estimate 71.4  
Market Capitalisation € 50,000  
Assets (liabilities) 48,000  
Goodwill 1,204 € 1,320
Amount by which unit's recoverable amount exceeds its carrying amount € 1,303  
Long-term assumption for benchmark brent price | $ / bbl 72  
Decrease in average projected commercial margins Percentage 65.00%  
Increase in projected discount rate 9.70%  
Nominal Growth Rate 16.80%  
Country Of Domicile [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Discount rate used in current measurement of fair value less costs of disposal 4.60%  
Europe [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Discount rate used in current measurement of fair value less costs of disposal 5.20%  
Goodwill € 95  
Individual Assets Or Cash generating Units [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Reversal of impairment loss € 776  
Bottom Of Range [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Weighted Average Cost of Capital, Percentage 5.30%  
Discount rate applied to cash flow projections (0.20%) (0.20%)
Bottom Of Range [Member] | Individual Assets Or Cash generating Units [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Weighted Average Cost of Capital, Pre Tax Rate Percentage 8.60%  
Top Of Range [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Weighted Average Cost of Capital, Percentage 15.80%  
Discount rate applied to cash flow projections 2.50% 2.60%
Top Of Range [Member] | Individual Assets Or Cash generating Units [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Weighted Average Cost of Capital, Pre Tax Rate Percentage 25.60%  
Oil & Gas and refining busines segment [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Weighted Average Cost of Capital, Marginal Decrease Percentage 0.40%  
Weighted Average Cost of Capital, Percentage 6.80%  
Chemical business line [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Weighted Average Cost of Capital, Marginal Decrease Percentage 0.50%  
Weighted Average Cost of Capital, Percentage 8.50%  
Gas & Power [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Weighted Average Cost of Capital, Marginal Decrease Percentage 0.20%  
Weighted Average Cost of Capital, Percentage 6.00%  
Goodwill € 932 € 1,025
Gas & Power [Member] | Country Of Domicile [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Goodwill 835 835
Gas & Power [Member] | Europe [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Goodwill 95 188
Refining & Marketing business line [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Impairment loss 130  
Gas & Power Segment [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Impairment loss € 146  
Refining activity [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Profitability margin per barrel 5  
Exploration & Production [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Goodwill € 179 € 202
Exploration & Production [Member] | Individual Assets Or Cash generating Units [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Reversal of impairment loss 776  
Impairment loss € 636  
Disclosure of amount of impairment loss based on which weighted average cost of capital is disclosed WACC relating to reversals of impairments of more than €100 million  
Exploration & Production [Member] | Bottom Of Range [Member] | Individual Assets Or Cash generating Units [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Weighted Average Cost of Capital, Percentage 5.50%  
Weighted Average Cost of Capital, Pre Tax Rate Percentage 8.60%  
Exploration & Production [Member] | Top Of Range [Member] | Individual Assets Or Cash generating Units [Member]    
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]    
Weighted Average Cost of Capital, Percentage 13.50%  
Weighted Average Cost of Capital, Pre Tax Rate Percentage 25.60%