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Property, plant and equipment (Details 3) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | € 70,793 | € 68,005 |
Additions | 8,490 | 9,067 |
Net reversals (impairments) | 207 | 86 |
Write-off | 239 | 289 | € 678
Net book amount at the end of the year | 63,158 | 70,793 | 68,005
Unproved mineral interest [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 2,450 | 2,212 |
Net reversals (impairments) | 147 | 190 |
Other changes and currency translation differences | (312) | 81 |
Net book amount at the end of the year | 2,390 | 2,450 | 2,212
Exploration Production Segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 17,040 | 24,307 |
Additions | 7,653 | 8,181 |
Net reversals (impairments) | 23 | (25) |
Write-off | (230) | (88) |
Reclassifications | (9,938) | (15,932) |
Other changes and currency translation differences | (3,708) | 597 |
Net book amount at the end of the year | 10,840 | 17,040 | 24,307
Exploration Production Segment [Member] | Exploratory wells in progress [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 221 | 93 |
Additions | 351 | 402 |
Write-off | (11) |  |
Reclassifications | (438) | (282) |
Other changes and currency translation differences | (15) | 8 |
Net book amount at the end of the year | 108 | 221 | 93
Exploration Production Segment [Member] | Exploratory wells completed and being evaluated [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 1,684 | 1,737 |
Write-off | (217) | (109) |
Reclassifications | 173 | 6 |
Other changes and currency translation differences | (377) | 50 |
Net book amount at the end of the year | 1,263 | 1,684 | 1,737
Exploration Production Segment [Member] | Exploratory successful wells in progress [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 913 | 807 |
Net reversals (impairments) | (13) | (5) |
Reclassifications | (117) | 78 |
Other changes and currency translation differences | (294) | 33 |
Net book amount at the end of the year | 489 | 913 | 807
Exploration Production Segment [Member] | Exploration activity and appraisal [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 2,818 | 2,637 |
Additions | 351 | 402 |
Net reversals (impairments) | (13) | (5) |
Write-off | (228) | (109) |
Reclassifications | (382) | (198) |
Other changes and currency translation differences | (686) | 91 |
Net book amount at the end of the year | 1,860 | 2,818 | 2,637
Exploration Production Segment [Member] | Unproved mineral interest [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 2,450 | 2,212 |
Additions | 112 | 2 |
Net reversals (impairments) | 147 | 190 |
Reclassifications | (7) | (35) |
Other changes and currency translation differences | (312) | 81 |
Net book amount at the end of the year | 2,390 | 2,450 | 2,212
Exploration Production Segment [Member] | Well and installments in progress [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 11,690 | 19,458 |
Additions | 7,190 | 7,777 |
Net reversals (impairments) | (111) | (210) |
Write-off | (2) | (6) |
Reclassifications | (9,538) | (15,699) |
Other changes and currency translation differences | (2,676) | 370 |
Net book amount at the end of the year | 6,553 | 11,690 | 19,458
Exploration Production Segment [Member] | Abandonment cost [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 82 |  |
Write-off |  | 27 |
Reclassifications | (11) |  |
Other changes and currency translation differences | (34) | 55 |
Net book amount at the end of the year | 37 | 82 |
Exploration Production Segment [Member] | Other tangible assets in progress [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Book amount at the beginning of the year | 14,222 | 21,670 |
Additions | 7,302 | 7,779 |
Net reversals (impairments) | 36 | (20) |
Write-off | (2) | 21 |
Reclassifications | (9,556) | (15,734) |
Other changes and currency translation differences | (3,022) | 506 |
Net book amount at the end of the year | € 8,980 | € 14,222 | € 21,670

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