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Finance Expenses (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest Expense |  |  |
Trade and other payables | ₩ 88,757 | ₩ 94,019 | ₩ 42,830
Short-term borrowings | 29,358 | 42,971 | 32,545
Long-term borrowings | 118,678 | 119,806 | 92,243
Debt securities | 1,805,253 | 1,827,511 | 1,771,544
Other financial liabilities | 540,867 | 558,464 | 505,112
Interest Expense (Before Capitalizing borrowing costs) | 2,582,913 | 2,642,771 | 2,444,274
Less: Capitalized borrowing costs | (587,488) | (595,960) | (575,816)
Interest expense | 1,995,425 | 2,046,811 | 1,868,458
Losses on sale of financial assets | 648 | 2,106 | 1
Losses on valuation of financial assets at fair value through profit or loss | 7,396 | 4,513 | 6,616
Losses on valuation of derivatives | 513,278 | 45,385 | 46,740
Losses on transaction of derivatives | 81,055 | 71,546 | 32,448
Losses on foreign currency translation | 215,047 | 553,731 | 393,859
Losses on foreign currency transaction | 79,103 | 55,509 | 121,763
Losses on repayment of financial liabilities | 35 | 0 | 0
Other Finance Expenses | 4,456 | 2,555 | 858
Total Finance Expense | ₩ 2,896,443 | ₩ 2,782,156 | ₩ 2,470,743

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