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Intangible assets and goodwill (Details 2) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill |  | Useful life
Copyrights, patents and other industrial property rights, service and operating rights [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | Finite | Finite
Computer software [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | Finite | Finite
Bottom of range [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 3 |
Bottom of range [member] | Copyrights, patents and other industrial property rights, service and operating rights [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | Indefinite |
Bottom of range [member] | Brand names [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 1 |
Bottom of range [member] | Other Intangible Assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | Indefinite |
Bottom of range [member] | Computer software [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 2 |
Bottom of range [member] | Copyrights, patents and other industrial property rights, service and operating rights One [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 1 |
Top of range [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 6 |
Top of range [member] | Copyrights, patents and other industrial property rights, service and operating rights [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | Indefinite |
Top of range [member] | Brand names [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 5 |
Top of range [member] | Other Intangible Assets [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | Indefinite |
Top of range [member] | Computer software [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 6 |
Top of range [member] | Copyrights, patents and other industrial property rights, service and operating rights One [Member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 16 |

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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 2017-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_a&doctype=Standard -URIDate 2017-03-09 + Details
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