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Sensitivity analysis for actuarial assumptions (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Actuarial assumption of expected rates of salary increases [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	₩ 354,852	₩ 344,874
1% Decrease	(305,494)	(304,685)
Actuarial assumption of discount rates [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	(313,597)	(305,031)
1% Decrease	₩ 377,148	₩ 371,689

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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