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Revenue from Contracts with Customers - Additional Information (Details) - KRW (₩) ₩ in Millions | 12 Months Ended |  |
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Revenue From Contracts With Customers [Line Items] |  |  |
Amount of revenue recognized from previous period's contract liabilities | ₩ 10,606 |  |
Transaction price allocated to unsatisfied performance obligations | ₩ 13,793 | ₩ 10,846 | ₩ 20,074
Within a Year |  |  |
Disclosure Of Revenue From Contracts With Customers [Line Items] |  |  |
Transaction price allocated to unsatisfied performance obligations, percentage | 99.30% |  |
Transaction price allocated to unsatisfied performance obligations | ₩ 13,692 |  |
More Than One Year |  |  |
Disclosure Of Revenue From Contracts With Customers [Line Items] |  |  |
Transaction price allocated to unsatisfied performance obligations, percentage | 0.70% |  |
Transaction price allocated to unsatisfied performance obligations | ₩ 101 |  |

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- Definition The amount of revenue from performance obligations satisfied (or partially satisfied) in previous periods. [Refer: Performance obligations [member]; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 116 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_c&doctype=Standard -URIDate 2020-01-01 + Details
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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 + Details
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