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Other-Financial Assets : Changes in the allowance for doubtful accounts of Loans and receivables (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts [Abstract]      
Beginning balance ₩ 8,948 ₩ 4,532 ₩ 0
Bad debt expense 22 2,465 4,352
Other (4,018) 1,951 180
Ending balance ₩ 4,952 ₩ 8,948 ₩ 4,532