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v3.19.1

Intangible assets (Details 2) | 12 Months Ended
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Dec. 31, 2018
Exploration rights [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | UOP - 33
Transport rights of natural gas [Member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 3
Other concessions, licenses, trademarks and similar items [Member] | Bottom of range [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 3
Other concessions, licenses, trademarks and similar items [Member] | Top of range [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 33
Service concession arrangements [Member] | Bottom of range [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 20
Service concession arrangements [Member] | Top of range [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 33
Capitalized costs for customer acquisition [Member] | Bottom of range [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 25
Capitalized costs for customer acquisition [Member] | Top of range [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 33
Other intangible assets [Member] | Bottom of range [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 4
Other intangible assets [Member] | Top of range [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Useful lives or amortisation rates, intangible assets other than goodwill | 20

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- Definition The useful lives or amortisation rates used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_a&doctype=Standard -URIDate 2018-03-16 + Details
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