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Dividend - Additional Information (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Dividends [abstract] |  |  |
Dividends paid | ₩ 269,766 | ₩ 269,659 | ₩ 245,097
Dividends paid per share | ₩ 1,100 | ₩ 1,100 | ₩ 1,000
Dividends declared | ₩ 326,487 |  |
Dividends declared per share | ₩ 1,350 |  |

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- Definition The amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2020-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2020-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2020-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2020-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_137_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 10 -IssueDate 2020-01-01 -Paragraph 13 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=10&code=ifrs-tx-2020-en-r&anchor=para_13&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_137_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Disclosure of dividends. + References No definition available. + Details
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