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Revenue from Contracts with Customers - Details of Amortization Costs Recognized as Cost of Revenues (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Assets Recognised From Costs To Obtain Or Fulfil Contracts With Customers [Abstract]
Amortization costs recognized as cost of revenues	₩ 998	₩ 2,036	₩ 2,231

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- Definition

The amount of amortisation for assets recognised from the costs incurred to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers; Amortisation expense]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 128
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_128_b&doctype=Standard
-URIDate 2020-01-01

+ Details

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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
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