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Financial Instruments by Category - Schedule of Net Income and Expenses From Financial Instruments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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