Income taxes - Reconciliation between statutory tax and effective tax charge (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes
Profit (loss) before taxation	€ 22,049	€ 10,685	€ (5,978)
Tax rate (IRES) (%)	24.00%	24.00%	24.00%
Statutory corporation tax charge (credit) on profit or loss	€ 5,292	€ 2,564	€ (1,435)
Increase (decrease) resulting from:
- higher tax charges related to subsidiaries outside Italy	3,388	2,301	1,980
- effect additional tax law no 7/2009	1,971
- impact pursuant to foreign tax effects of italian entities	66	108	108
- effect of the valuation of the investments under the equity method	50	180	97
- effect due to the tax regime provided for intercompany dividends	11	54	96
- Italian regional income tax (IRAP)	(18)	140	107
- tax effects related to previous years	(19)	52	(30)
- effect of reversals (impairments) of deferred tax assets	(241)
- impact pursuant to the write-down of deferred tax assets	(2,087)	(666)	1,785
- other adjustments	(325)	112	(58)
Net tax effect	2,796	2,281	4,085
Income tax expense	8,088	4,845	2,650
Exploration & Production
Increase (decrease) resulting from:
- higher tax charges related to subsidiaries outside Italy	€ 2,940	€ 2,040	€ 1,777

Disclosure of Income Tax Explanatory.

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Amount of impact pursuant to foreign tax effects of italian entities.

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The amount of impact pursuant to the write-down of deferred tax assets and recalculation of tax rates.

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Increase Decrease Tax Expense Income At Applicable Tax Rate [Abstract]

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The amount of net tax effects during the period for reconciliation between accounting profit and tax expense (income).

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to the tax regime provided for intercompany dividends.

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Tax effect from additional corporate taxes.

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to regional income tax.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to reversals (impairments) of deferred tax assets.

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Tax effect of valuation of investments under equity method.

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Amount of tax effects related to previous years.

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The applicable income tax rate.

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate]

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The profit (loss) before tax expense or income. [Refer: Profit (loss)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to foreign tax rates. [Refer: Accounting profit]

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The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate]

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