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Property, plant and equipment (Details 4) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |
Net book amount - beginning of the year | € 63,158 | € 70,793
Additions | 8,778 | 8,490
Reclassification to proved mineral interest |  |
Net book amount - end of the year | 60,302 | 63,158
Unproved Mineral Interest [Member] |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |
Net book amount - beginning of the year | 2,390 | 2,450
Additions | 592 | 112
Net (impairments) reversals | (505) | 147
Reclassification to proved mineral interest | (110) | (7)
Other changes and currency translation differences | 111 | (312)
Net book amount - end of the year | 2,478 | 2,390
Unproved Mineral Interest [Member] | Congo [Member] |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |
Net book amount - beginning of the year | 1,162 | 1,254
Additions | 26 |
Net (impairments) reversals | (429) | 72
Reclassification to proved mineral interest | (32) | (7)
Other changes and currency translation differences | 42 | (157)
Net book amount - end of the year | 769 | 1,162
Unproved Mineral Interest [Member] | Nigeria [Member] |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |
Net book amount - beginning of the year | 825 | 938
Additions | 56 |
Net (impairments) reversals |  |
Reclassification to proved mineral interest |  |
Other changes and currency translation differences | 40 | (113)
Net book amount - end of the year | 921 | 825
Unproved Mineral Interest [Member] | Turkmenistan [Member] |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |
Net book amount - beginning of the year | 192 | 138
Additions |  |
Net (impairments) reversals | (76) | 75
Reclassification to proved mineral interest | (44) |
Other changes and currency translation differences | 5 | (21)
Net book amount - end of the year | 77 | 192
Unproved Mineral Interest [Member] | USA [Member] |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |
Net book amount - beginning of the year | 99 | 113
Additions |  |
Net (impairments) reversals |  |
Reclassification to proved mineral interest |  |
Other changes and currency translation differences | 4 | (14)
Net book amount - end of the year | 103 | 99
Unproved Mineral Interest [Member] | Algeria [Member] |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |
Net book amount - beginning of the year | 105 |
Additions |  | 112
Net (impairments) reversals |  |
Reclassification to proved mineral interest | (32) |
Other changes and currency translation differences | 4 | (7)
Net book amount - end of the year | 77 | 105
Unproved Mineral Interest [Member] | Egypt [Member] |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |
Net book amount - beginning of the year | 7 | 7
Additions | 23 |
Net (impairments) reversals |  |
Reclassification to proved mineral interest | (2) |
Other changes and currency translation differences | 1 |
Net book amount - end of the year | 29 | € 7
Unproved Mineral Interest [Member] | United Arab Emirates [Member] |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |
Additions | 487 |
Other changes and currency translation differences | 15 |
Net book amount - end of the year | € 502 |

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- Definition The amount of impairment loss and reversal of impairment loss recognised in profit or loss for property, plant and equipment. + References No definition available. + Details
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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 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + Details
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