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Cash and Cash Equivalents (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Abstract]        
Total cash ₩ 138 ₩ 132 ₩ 119  
Demand Deposit Accounts 927,650 968,966 1,725,785  
Short-term deposits, classified as cash equivalents 211,424 559,239 120,594  
Short-term investments, classified as cash equivalents 219,133 841,402 1,204,855  
Total cash and cash equivalents ₩ 1,358,345 ₩ 2,369,739 ₩ 3,051,353 ₩ 3,783,065