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Other Financial Assets - Summary of Changes in the Allowance for Doubtful Accounts of Loans and Receivables (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts [Abstract]      
Beginning balance ₩ 20,267 ₩ 15,094 ₩ 4,952
Bad debt expense 30,942 5,173 10,142
Other 1,468 0 0
Ending balance ₩ 52,677 ₩ 20,267 ₩ 15,094