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Employee benefits (Details 6) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee benefits [Line Items] |  |  |
Actuarial assumption of discount rates | 3.68% | 4.64% | 5.114%
Voluntary retirement rate [Abstract] |  |  |
Actuarial assumption of expected rates of salary increases | 3.00% | 3.00% | 3.00%
Retirement age [Abstract] |  |  |
Mortality rate | RV - 2014 | RV - 2014 | RV - 2014
Men [Member] |  |  |
Voluntary retirement rate [Abstract] |  |  |
Actuarial assumption voluntary retirement rate | 6.49% | 6.49% | 6.49%
Retirement age [Abstract] |  |  |
Actuarial assumption of retirement age | 65 years | 65 years | 65 years
Women [Member] |  |  |
Voluntary retirement rate [Abstract] |  |  |
Actuarial assumption voluntary retirement rate | 6.49% | 6.49% | 6.49%
Retirement age [Abstract] |  |  |
Actuarial assumption of retirement age | 60 years | 60 years | 60 years

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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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + 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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