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Earnings per share (Details) - EUR (€) € / shares in Units, € in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Earnings Per Share Explanatory [Line Items]
Weighted average number of shares used for the calculation of the basic earnings per share	3,601,140,133	3,601,140,133	3,601,140,133
Potential share to be issued for ILT incentive plan	2,782,584	1,691,413	1,691,413
Weighted average number of shares used for the calculation of the diluted earnings per share	3,603,922,717	3,602,831,546	3,601,140,133
Eni's net profit	€ 4,126	€ 3,374	€ (1,464)
Basic earning (loss) per share	€ 1.15	€ 0.94	€ (0.41)
Diluted earning (loss) per share	€ 1.15	€ 0.94	€ (0.41)
Eni's net profit – Continuing operations	€ 4,126	€ 3,374	€ (1,051)
Basic earning (loss) per share	€ 1.15	€ 0.94	€ (0.29)
Diluted earning (loss) per share	€ 1.15	€ 0.94	€ (0.29)
Eni's net profit - Discontinued operations			€ (413)
Basic earning (loss) per share			€ (0.12)
Diluted earning (loss) per share			€ (0.12)

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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]]

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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).

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Basic earnings (loss) per share from continuing operations. [Refer: Basic earnings (loss) per share; Continuing operations [member]]

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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]]

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Diluted earnings (loss) per share from discontinued operations. [Refer: Diluted earnings (loss) per share; Discontinued operations [member]]

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) attributable to ordinary equity holders of the parent equity. [Refer: Profit (loss)]

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The profit (loss) from continuing operations attributable to ordinary equity holders of the parent equity. [Refer: Continuing operations [member]; Profit (loss) from continuing operations]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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