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Finance Expenses (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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