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Trade and other receivables (Details 1) € in Millions | 12 Months Ended
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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: |