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Financial Instruments by Category - Schedule of Net Income and Expenses From Financial Instruments (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financial Assets at Amortized Cost | Interest Income |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Income and expenses on financial assets at amortized cost | ₩ 1,088 | ₩ 1,626 | ₩ 819
Financial Assets at Amortized Cost | Differences in Foreign Currency |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Income and expenses on financial assets at amortized cost | (1,796) | 1,267 | 159
Financial Liabilities at Amortized Cost | Interests Expense |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Income and expenses on financial liabilities at amortized cost | (186) | (277) |
Financial Liabilities at Amortized Cost | Differences in Foreign Currency |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Income and expenses on financial liabilities at amortized cost | ₩ 537 | ₩ (22) | ₩ 105

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