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Cash and Cash Equivalents (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]        
Total cash ₩ 871 ₩ 266 ₩ 138  
Demand Deposit Accounts 1,291,058 1,117,499 927,650  
Short-term deposits, classified as cash equivalents 432,263 527,235 211,424  
Short-term investments, classified as cash equivalents 305,392 165,129 219,133  
Total cash and cash equivalents ₩ 2,029,584 ₩ 1,810,129 ₩ 1,358,345 ₩ 2,369,739