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Net reversal (impairment) of tangible and intangible assets (Details Textual) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 EUR (€) bbl $ / bbl $ / BBL | Dec. 31, 2018 USD ($) bbl $ / bbl $ / BBL | Dec. 31, 2017 EUR (€)
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Discount rate used in current measurement of fair value less costs of disposal | 0.00% | 0.00% |
Impairment loss | € 1,701 |  | € 913
Profitability margin per barrel | bbl | 5 | 5 |
Disclosure of amount of impairment loss based on which weighted average cost of capital is disclosed | WACC relating to impairment losses/reversals of impairments of more than 100 million | WACC relating to impairment losses/reversals of impairments of more than 100 million |
Long Term Assumption For Benchmark Brent Price | $ / bbl | 85 | 85 |
Oil Price | $ / BBL | 60 | 60 |
Predicted Oil Price | $ / BBL | 70 | 70 |
Decrease in oil price | $ / BBL | 20 | 20 |
Gas Distribution Company of Thessaloniki Thessaly SA [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Additional recognition, goodwill | $ |  |  |
Bottom of range [member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Weighted Average Cost Of Capital Percentage | 6.20% | 6.20% |
Top of range [member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Weighted Average Cost Of Capital Percentage | 16.00% | 16.00% |
Oil & Gas and refining business segment [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Weighted Average Cost Of Capital Marginal Decrease Percentage | 0.50% | 0.50% |
Weighted Average Cost Of Capital Percentage | 7.30% | 7.30% |
Gas & Power [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss | € 66 |  |
Refining & Marketing business line [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss | € 156 |  |
Exploration & Production [Member] | Individual assets or cash-generating units [member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Weighted Average Cost Of Capital Percentage | 6.00% | 6.00% |
Reversal of impairment loss | $ |  | $ 299 |
Impairment loss | € 1,025 |  |
Exploration & Production [Member] | Bottom of range [member] | Individual assets or cash-generating units [member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Weighted Average Cost Of Capital Pre Tax Rate Percentage | 6.00% | 6.00% |
Exploration & Production [Member] | Top of range [member] | Individual assets or cash-generating units [member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Weighted Average Cost Of Capital Pre Tax Rate Percentage | 9.00% | 9.00% |

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