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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts [Abstract]      
Beginning balance ₩ 15,094 ₩ 4,952 ₩ 8,948
Bad debt expense 5,173 10,142 22
Other 0 0 (4,018)
Ending balance ₩ 20,267 ₩ 15,094 ₩ 4,952