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Revenue from Contracts with Customers - Transaction Price Allocated to Unsatisfied Performance Obligations (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items]
Total - Transaction price allocated to unsatisfied performance obligations	₩ 13,793	₩ 10,846	₩ 20,074
Micro-transaction and Subscription Revenue
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items]
Total - Transaction price allocated to unsatisfied performance obligations	12,886	8,742	12,017
Micro-transaction and Subscription Revenue | Online Game
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items]
Total - Transaction price allocated to unsatisfied performance obligations	8,418	5,358	6,160
Micro-transaction and Subscription Revenue | Mobile Game
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items]
Total - Transaction price allocated to unsatisfied performance obligations	4,468	3,384	5,857
Royalties and License Fees
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items]
Total - Transaction price allocated to unsatisfied performance obligations	307	1,403	7,223
Royalties and License Fees | Online Game
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items]
Total - Transaction price allocated to unsatisfied performance obligations	286	573	7,203
Royalties and License Fees | Mobile Game
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items]
Total - Transaction price allocated to unsatisfied performance obligations	21	830	20
Website and Application Development
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items]
Total - Transaction price allocated to unsatisfied performance obligations	₩ 600	₩ 701	₩ 834

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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 the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 120
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_120_a&doctype=Standard
-URIDate 2020-01-01

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