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Earnings (loss) per share (Details) - EUR (€) € / shares in Units, € in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Earnings (loss) per share |  |  |
Weighted average number of shares used for basic earnings (loss) per share | 3,565,973,883 | 3,572,549,651 | 3,592,249,603
Potential shares to be issued for ILT incentive plan | 7,598,593 |  | 2,251,406
Weighted average number of shares used for diluted earnings per share | 3,573,572,476 | 3,572,549,651 | 3,594,501,009
Net profit (loss) attributable to Eni | € 5,821 | € (8,635) | € 148
Remuneration of subordinated perpetual bonds net of tax effect | (95) |  |
Eni's net profit (loss) for basic and diluted earnings (loss) per share | € 5,726 | € (8,635) | € 148
Basic earnings (loss) per share | € 1.61 | € (2.42) | € 0.04
Diluted earnings (loss) per share | € 1.60 | € (2.42) | € 0.04

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- Definition The adjustment to reconcile profit (loss) attributable to the parent entity to the numerator used in calculating earnings (loss) per share, resulting from remuneration on subordinated perpetual bonds, net of tax. + References No definition available. + Details
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- Definition Disclosure Of Earnings Per Share Explanatory. + References No definition available. + Details
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- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2021-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_70_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2021-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_66&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2021-01-01 -Paragraph 67 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_67&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2021-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_66&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2021-01-01 -Paragraph 67 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_67&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2021-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_70_a&doctype=Standard -URIDate 2021-03-24 + Details
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