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Financial Risk Management - Summary of Impact of Fluctuation in Foreign Currency Exchange Rates on Group's Monetary Assets and Liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Financial Instruments [Line Items] |  |
Increase in company's monetary assets and liabilities with the effect of foreign currency exchange rate | ₩ 2,109 | ₩ 534
Decrease in company's monetary assets and liabilities with the effect of foreign currency exchange rate | (2,109) | (534)
USD |  |
Disclosure Of Financial Instruments [Line Items] |  |
Increase in company's monetary assets and liabilities with the effect of foreign currency exchange rate | 1,468 | 271
Decrease in company's monetary assets and liabilities with the effect of foreign currency exchange rate | (1,468) | (271)
JPY |  |
Disclosure Of Financial Instruments [Line Items] |  |
Increase in company's monetary assets and liabilities with the effect of foreign currency exchange rate | 201 | 123
Decrease in company's monetary assets and liabilities with the effect of foreign currency exchange rate | (201) | (123)
Others |  |
Disclosure Of Financial Instruments [Line Items] |  |
Increase in company's monetary assets and liabilities with the effect of foreign currency exchange rate | 440 | 140
Decrease in company's monetary assets and liabilities with the effect of foreign currency exchange rate | ₩ (440) | ₩ (140)

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- Definition Decrease in monetary assets and liabilities due to decrease in foreign currency exchange rate. + References No definition available. + Details
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X
- Definition Increase in monetary assets and liabilities due to increase in foreign currency exchange rate. + References No definition available. + Details
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