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Property, plant and equipment (Details 6) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |
Book amount at the beginning of the year | € 70,793 | € 68,005
Additions | 8,490 | 9,067
Net (impairments) reversals | 207 | 86
Net book amount at the end of the year | 63,158 | 70,793
Unproved Mineral Interest [Member] |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |
Book amount at the beginning of the year | 2,450 | 2,212
Additions | 112 | 2
Net (impairments) reversals | 147 | 190
Reclassification to proved mineral interest | (7) | (35)
Other changes and currency translation differences | (312) | 81
Net book amount at the end of the year | 2,390 | 2,450
Unproved Mineral Interest [Member] | Congo [Member] |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |
Book amount at the beginning of the year | 1,254 | 1,021
Net (impairments) reversals | 72 | 190
Reclassification to proved mineral interest | (7) |
Other changes and currency translation differences | (157) | 43
Net book amount at the end of the year | 1,162 | 1,254
Unproved Mineral Interest [Member] | Nigeria [Member] |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |
Book amount at the beginning of the year | 938 | 908
Other changes and currency translation differences | (113) | 30
Net book amount at the end of the year | 825 | 938
Unproved Mineral Interest [Member] | Turkmenistan [Member] |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |
Book amount at the beginning of the year | 138 | 165
Net (impairments) reversals | 75 |
Reclassification to proved mineral interest |  | (31)
Other changes and currency translation differences | (21) | 4
Net book amount at the end of the year | 192 | 138
Unproved Mineral Interest [Member] | USA [Member] |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |
Book amount at the beginning of the year | 113 | 109
Other changes and currency translation differences | (14) | 4
Net book amount at the end of the year | 99 | 113
Unproved Mineral Interest [Member] | Algeria [Member] |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |
Additions | 112 |
Other changes and currency translation differences | (7) |
Net book amount at the end of the year | 105 |
Unproved Mineral Interest [Member] | Egypt [Member] |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |
Book amount at the beginning of the year | 7 | 9
Additions |  | 2
Reclassification to proved mineral interest |  | (4)
Net book amount at the end of the year | € 7 | € 7

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- Definition The increase (decrease) in property, plant and equipment resulting from other changes and currency translation differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. + References No definition available. + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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