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Sensitivity analysis for actuarial assumptions (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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