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Trade and other receivables (Details 1) € in Millions	12 Months Ended
	Dec. 31, 2017 EUR (€)
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]
Carrying amount, Beginning of period	€ 2,371
Additions	927
Deductions	(455)
Other changes	(114)
Carrying amount, end of period	2,729
Trade receivables [member]
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]
Carrying amount, Beginning of period	1,817
Additions	539
Deductions	(448)
Other changes	(60)
Carrying amount, end of period	1,848
Financing Receivables [Member]
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]
Carrying amount, Beginning of period	68
Additions	31
Deductions	(1)
Other changes	(8)
Carrying amount, end of period	90
Other Receivables [Member]
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]
Carrying amount, Beginning of period	486
Additions	388
Deductions	(6)
Other changes	(77)
Carrying amount, end of period	€ 791

X

- Definition

The amount of additions in accumulated impairment losses of trade and other receivables.

+ References

No definition available.

+ Details

Name:	E_AdditionsAllowanceAccountForCreditLossesOfTradeAndOtherReceivables
Namespace Prefix:	E_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of accumulated impairment losses of trade and other receivables.

+ References

No definition available.

+ Details

Name:	E_AllowanceAccountForCreditLossesOfTradeAndOtherReceivables
Namespace Prefix:	E_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of deduction in accumulated impairment losses of trade and other receivables.

+ References

No definition available.

+ Details

Name:	E_DeductionAllowanceAccountForCreditLossesOfTradeAndOtherReceivables
Namespace Prefix:	E_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	E_DisclosureOfTradeAndOtherReceivablesLineItems
Namespace Prefix:	E_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of other changes in accumulated impairment losses of trade and other receivables.

+ References

No definition available.

+ Details

Name:	E_OtherChangeToAllowanceAccountForCreditLossesOfTradeAndOtherReceivables
Namespace Prefix:	E_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=E_FinancingReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=E_OtherReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: