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Assets held for sale and liabilities directly associated with assets held for sale (Details Textual) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
DisclosureOfDiscontinuedOperationsExplanatoryLineItems [Line Items] |  |
Liabilities included in disposal groups classified as held for sale | € 87 |
Tigaz Zrt [Member] |  |
DisclosureOfDiscontinuedOperationsExplanatoryLineItems [Line Items] |  |
% Ownership | 48.55% | 48.55%
Percentage of Ownership Interest Divested | 98.99% |
Tigaz dso [Member] |  |
DisclosureOfDiscontinuedOperationsExplanatoryLineItems [Line Items] |  |
% Ownership | 100.00% |
Current assets or disposal groups classified as held for sale | € 31 |
Current liabilities included in disposal groups classified as held for sale | 27 |
Tigaz dso [Member] | Gross carrying amount [member] |  |
DisclosureOfDiscontinuedOperationsExplanatoryLineItems [Line Items] |  |
Non-current assets or disposal groups classified as held for sale | 241 |
Liabilities included in disposal groups classified as held for sale | 65 |
Met holding ag [Member] |  |
DisclosureOfDiscontinuedOperationsExplanatoryLineItems [Line Items] |  |
Non-current assets or disposal groups classified as held for sale | 323 |
Liabilities included in disposal groups classified as held for sale | € 87 |
Unimar llc [Member] |  |
DisclosureOfDiscontinuedOperationsExplanatoryLineItems [Line Items] |  |
% Ownership | 50.00% |
Non-current assets or disposal groups classified as held for sale | € 29 |
Lasmo sanga sanga [Member] |  |
DisclosureOfDiscontinuedOperationsExplanatoryLineItems [Line Items] |  |
% Ownership | 26.25% |
Non-current assets or disposal groups classified as held for sale | € 53 |
Current assets or disposal groups classified as held for sale | 37 |
Current liabilities included in disposal groups classified as held for sale | 10 |
Liabilities included in disposal groups classified as held for sale | € 22 |

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- Definition The amount of liabilities included in disposal groups classified as held for sale. [Refer: Liabilities; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2017-01-01 -Paragraph 38 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_38&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 p -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_p&doctype=Standard -URIDate 2017-03-09 + Details
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