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Sensitivity analysis for actuarial assumptions (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Actuarial assumption of expected rates of salary increases
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	₩ 416,956	₩ 354,852
1% Decrease	(363,820)	(305,494)
Actuarial assumption of discount rates
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	(377,221)	(313,597)
1% Decrease	₩ 445,833	₩ 377,148

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- Definition

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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]]

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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]]

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