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Other-Financial Assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Other Financial Assets [Line Items] |  |
Current Other financial assets | ₩ 1,561,445 | ₩ 1,415,204
Non-Current Other financial assets | 1,290,820 | 1,283,730
Loans and receivables |  |
Other Financial Assets [Line Items] |  |
Current Other financial assets | 77,963 | 63,233
Non-Current Other financial assets | 712,199 | 675,474
Loans and receivables | Gross amount |  |
Other Financial Assets [Line Items] |  |
Current Other financial assets | 78,806 | 64,111
Non-Current Other financial assets | 762,555 | 725,755
Loans and receivables | Allowance for doubtful accounts |  |
Other Financial Assets [Line Items] |  |
Current Other financial assets | (1) | (31)
Non-Current Other financial assets | (20,266) | (15,063)
Loans and receivables | Present value discount |  |
Other Financial Assets [Line Items] |  |
Current Other financial assets | (842) | (847)
Non-Current Other financial assets | (30,090) | (35,218)
Short-term financial instruments |  |
Other Financial Assets [Line Items] |  |
Current Other financial assets | 1,483,482 | 1,351,971
Long-term financial instruments |  |
Other Financial Assets [Line Items] |  |
Non-Current Other financial assets | ₩ 578,621 | ₩ 608,256

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