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Finance Expenses (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest Expense      
Trade and other payables ₩ 94,019 ₩ 42,830 ₩ 57,160
Short-term borrowings 42,971 32,545 35,891
Long-term borrowings 119,806 92,243 87,011
Debt securities 1,827,511 1,771,544 1,698,232
Other financial liabilities 558,464 505,112 491,665
Interest Expense (Before Capitalizing borrowing costs) 2,642,771 2,444,274 2,369,959
Less: Capitalized borrowing costs (595,960) (575,816) (580,407)
Interest expense 2,046,811 1,868,458 1,789,552
Losses on sale of financial assets 2,106 1 2,343
Losses on valuation of financial assets at fair value through profit or loss 4,513 6,616 0
Impairment of available-for-sale financial assets 0 0 2,713
Losses on valuation of derivatives 45,385 46,740 890,832
Losses on transaction of derivatives 71,546 32,448 198,218
Losses on foreign currency translation 553,731 393,859 207,944
Losses on foreign currency transaction 55,509 121,763 35,175
Losses on repayment of financial liabilities 0 0 5
Other Finance Expenses 2,555 858 1,170
Total Finance Expense ₩ 2,782,156 ₩ 2,470,743 ₩ 3,127,952