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Provisions for contingencies (Details Textual) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 EUR (€)
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Provision for decommissioning, restoration and rehabilitation costs		$ 7,757	€ 7,638
Loss Adjustments and Actuarial Provisions [Member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Reinsurance contracts receivable	€ 236
Refining And Marketing [Member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Environment related provision	348
Exploration & Production [Member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Legal proceedings provision	653
Provision for taxes	397
Gas And Power Segment [Member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Legal proceedings provision	503
Syndial SpA [Member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Environment related provision	2,009
ISAF SpA [Member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Profit (loss) on disposal of investments and changes in value of investments	€ 114
Bottom of range [member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Discount rate used in current estimate of value in use	0.20%	0.20%	0.01%
Top of range [member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Discount rate used in current estimate of value in use	6.10%	6.10%	5.98%
Exploration Production Segment [Member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Provision for decommissioning, restoration and rehabilitation costs	€ 6,266
Oil and natural gas [Member]
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]
Decommissioning costs Revision of Previous Estimates	502
Increase (decrease) through change in discount rate, other provisions	€ 259

X

- Definition

The amount of revision of estimates related to decommissioning, restoration and rehabilitation.

+ References

No definition available.

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- Definition

The amount of provision for environmental risks.

+ References

No definition available.

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- Definition

The amount of provision for taxes.

+ References

No definition available.

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- Definition

The receivable of amount from reinsurance.

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- Definition

The discount rate used in the current estimate of the present value of the future cash flows expected to be derived from an asset or cash-generating unit.

+ References

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- Definition

The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions]

+ References

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- Definition

The amount of provision for legal proceedings. [Refer: Other provisions]

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- Definition

The profit (loss) on disposal of investments and changes in the value of investments. [Refer: Profit (loss)]

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- Definition

The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions]

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