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Sensitivity analysis for actuarial assumptions (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Actuarial assumption of expected rates of salary increases
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	₩ 488,087	₩ 442,748
1% Decrease	(425,708)	(386,147)
Actuarial assumption of discount rates
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	(443,527)	(402,099)
1% Decrease	₩ 524,856	₩ 475,765

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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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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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