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Investment Properties - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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
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-IssueDate 2020-01-01
-Paragraph 30
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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
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-IssueDate 2020-01-01
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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

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-IssueDate 2020-01-01
-Paragraph 97
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