XML 181 R158.htm IDEA: XBRL DOCUMENT v3.19.1

Employee benefits (Details 6)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee benefits [Line Items]
Actuarial assumption of discount rates	4.642%	5.114%	4.522%
Voluntary retirement rate [Abstract]
Actuarial assumption of expected rates of salary increases	3.00%	3.00%	3.60%
Retirement age [Abstract]
Mortality rate	RV - 2014	RV - 2014	RV - 2009
Men [Member]
Voluntary retirement rate [Abstract]
Actuarial assumption voluntary retirement rate	6.49%	6.49%	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%	6.49%	7.16%
Retirement age [Abstract]
Actuarial assumption of retirement age	60	60	60

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
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-IssueDate 2018-01-01
-Paragraph 144
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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
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-Paragraph 144
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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
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- Definition

The expected voluntary retirement rate.

+ References

No definition available.

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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.

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