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Finance Expenses (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest Expense |  |  |
Trade and other payables | ₩ 42,830 | ₩ 57,160 | ₩ 68,375
Short-term borrowings | 32,545 | 35,891 | 6,969
Long-term borrowings | 92,243 | 87,011 | 91,584
Debt securities | 1,771,544 | 1,698,232 | 1,922,900
Other financial liabilities | 505,112 | 491,665 | 482,428
Interest Expense (Before Capitalizing borrowing costs) | 2,444,274 | 2,369,959 | 2,572,256
Less: Capitalized borrowing costs | (575,816) | (580,407) | (819,388)
Interest expense | 1,868,458 | 1,789,552 | 1,752,868
Losses on sale of financial assets | 1 | 2,343 | 9
Losses on valuation of financial assets at fair value through profit or loss | 6,616 | 0 | 0
Impairment of available-for-sale financial assets |  | 2,713 | 86,703
Losses on valuation of derivatives | 46,740 | 890,832 | 5,762
Losses on transaction of derivatives | 32,448 | 198,218 | 101,987
Losses on foreign currency translation | 393,859 | 207,944 | 406,849
Losses on foreign currency transaction | 121,763 | 35,175 | 57,889
Losses on repayment of financial liabilities | 0 | 5 | 23,000
Other Finance Expenses | 858 | 1,170 | 2,020
Total Finance Expense | ₩ 2,470,743 | ₩ 3,127,952 | ₩ 2,437,087

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