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Impairment review of tangible and intangible assets and right-of-use assets - Additional Information (Details) € in Millions | 12 Months Ended
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Dec. 31, 2019 EUR (€) $ / MMBTU $ / bbl | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€)
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Period over which management has projected cash flows | 4 years |  |
Long-term Brent price | $ / bbl | 70 |  |
Weighted-average cost of capital | 7.40% | 7.30% |
Impairment loss |  | € 726 |
Italian spot gas benchmark reference price | $ / MMBTU | 7.8 |  |
Reversal of impairment loss |  |  | € 158
Flat long-term Brent price | $ / bbl | 50 |  |
Flat Italian gas price | $ / MMBTU | 5 |  |
Exploration & Production |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Impairment loss | € 1,217 |  |
Reduction in headroom observed | 2.00% |  |
Exploration & Production | Assets for which impairment or reversal was higher than EUR 100 million |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Amount of impairment loss based on which weighted average cost of capital is disclosed | € 100 |  |
Weighted-average cost of capital | 6.40% |  |
Pre-tax weighted-average cost of capital | 6.90% |  |
Exploration & Production | Congo |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Weighted-average cost of capital | 7.60% |  |
Exploration & Production | Italy |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Weighted-average cost of capital | 6.40% |  |
Exploration & Production | USA |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Weighted-average cost of capital | 6.50% |  |
Refining & Marketing |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Impairment loss | € 819 |  |
Refining & Marketing | Assets for which impairment or reversal was higher than EUR 100 million |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Amount of impairment loss based on which weighted average cost of capital is disclosed | € 100 |  |
Weighted-average cost of capital | 6.60% |  |
Pre-tax weighted-average cost of capital | 7.10% |  |
Refining & Marketing | Sannazzaro refinery |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Impairment loss | € 684 |  |
Chemicals |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Impairment loss | 103 |  |
Gas & Power |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Impairment loss | € 37 |  |
Gas & Power | Forecast |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Estimated production within 2035 (as a percent of reserves) | 85.00% |  |
Proven reserves, risk (as a percent) | 70.00% |  |
Probable/possible reserves, risk (as a percent) | 30.00% |  |
Overall net present value realized within 2035 (as a percent) | 94.00% |  |
CGU Gas Market |  |  |
Impairment review of tangible and intangible assets and right-of-use assets |  |  |
Growth rate used to extrapolate cash flow projections | 0.00% |  |

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