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Employee benefits (Details 6)	12 Months Ended
	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

X

- 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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X

- 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

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X

- 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

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X

- Definition

The expected voluntary retirement rate.

+ References

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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

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- References

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