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Investment Properties - Additional Information (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about investment property [line items] |  |
Fair value of investment properties | ₩ 2,645,482 | ₩ 2,304,583
Rental income from investment properties | 203,763 | ₩ 198,636
Future minimum lease fee | 221,932 |
Less than 1 year [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Future minimum lease fee | 50,769 |
1-5 years [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Future minimum lease fee | 92,728 |
More than 5 years [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Future minimum lease fee | ₩ 78,435 |

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- Definition The amount of investment property, for which fair value was used as deemed cost in the opening IFRS statement of financial position. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 30 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_30&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of rental income arising from investment property recognised in profit or loss. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2020-01-01 -Paragraph 75 -Subparagraph f -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2020-en-r&anchor=para_75_f_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of undiscounted operating lease payments to be received. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_97&doctype=Standard -URIDate 2020-01-01 + Details
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