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Employee benefits (Details 5)	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Actuarial assumption of discount rates [member]
Discount rate		1.60%	1.80%
Actuarial assumption of discount rates [member] | Bottom of range [member]
Discount rate	1.22%
Actuarial assumption of discount rates [member] | Top of range [member]
Discount rate	1.24%
Actuarial assumption of expected rates of salary increases [member]
Rate of increase in compensation levels	3.00%	5.00%	5.00%

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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- 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

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