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Employee benefits (Details 6) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee benefits [Line Items] |  |  |
Actuarial assumption of discount rates | 5.114% | 4.522% | 4.89%
Voluntary retirement rate [Abstract] |  |  |
Actuarial assumption of expected rates of salary increases | 3.00% | 3.60% | 3.60%
Retirement age [Abstract] |  |  |
Mortality rate | RV - 2014 | RV - 2009 | RV - 2009
Men [Member] |  |  |
Voluntary retirement rate [Abstract] |  |  |
Actuarial assumption voluntary retirement rate | 6.49% | 7.16% | 7.16%
Retirement age [Abstract] |  |  |
Actuarial assumption of retirement age | 65 | 65 | 65
Women [Member] |  |  |
Voluntary retirement rate [Abstract] |  |  |
Actuarial assumption voluntary retirement rate | 6.49% | 7.16% | 7.16%
Retirement age [Abstract] |  |  |
Actuarial assumption of retirement age | 60 | 60 | 60

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The retirement age used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The expected voluntary retirement rate. + References No definition available. + Details
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- Definition The description of mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation. + References No definition available. + Details
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- Details
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