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Property, plant and equipment (Details 4) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property Plant And Equipment |  |  |
Costs for exploratory wells suspended at the beginning of the period | € 1,684 | € 1,737 | € 1,568
Increases for which is ongoing the determination of proved reserves | 451 | 282 | 550
Amounts previously capitalized and expensed in the period | (217) | (109) | (501)
Reclassification to successful exploratory wells following the estimation of proved reserves | (278) | (276) | (30)
Disposals | (199) |  | (4)
Currency translation differences | (178) | 50 | 154
Costs for exploratory wells suspended at the end of the period | € 1,263 | € 1,684 | € 1,737

X
- Definition The amount of costs for exploratory well that is pending the determination of proved reserves. + References No definition available. + Details
Name: | E_CostsForExploratoryWellsSuspended
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Additions to costs for exploratory well that were added during the reporting period pending the determination of proved reserves. + References No definition available. + Details
Name: | E_CostsForExploratoryWellsSuspendedAdditionsPendingDeterminationOfProvedReserves
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of costs for exploratory well for which proved reserves were not found at the exploratory well. + References No definition available. + Details
Name: | E_CostsForExploratoryWellsSuspendedchargedToExpense
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in exchange differences for exploratory wells. + References No definition available. + Details
Name: | E_CostsForExploratoryWellsSuspendedincreasedecreaseInExchangeDifferences
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
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X
- Definition Disposal of exploratory well during the reporting period. + References No definition available. + Details
Name: | E_CostsForExploratoryWellsSuspendedsales
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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X
- Definition Reclassified costs to productive wells on determination of proved reserves. + References No definition available. + Details
Name: | E_ReclassificationToProductiveWellsOnDeterminationOfProvedReserves
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
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