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Finance Income (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest Income |  |  |
Cash and cash equivalents | ₩ 9,419 | ₩ 42,861 | ₩ 40,704
Financial assets at fair value through profit or loss | 19,114 | 29,411 | 21,713
Financial assets at amortized cost | 612 | 539 | 89
Loans | 26,232 | 63,448 | 21,925
Short-term financial instrument | 25,540 | 49,070 | 41,025
Long-term financial instrument | 10,406 | 12,794 | 7,920
Other financial assets | 228 | 54 | 1
Trade and other receivables | 151,035 | 69,941 | 90,390
Total Interest Income | 242,586 | 268,118 | 223,767
Dividends income | 7,316 | 13,838 | 12,777
Gains on disposal of financial assets | 11,992 | 3,866 | 1,838
Gains on valuation of financial assets at fair value through profit or loss | 12,904 | 5,575 | 8,495
Gains on valuation of derivatives | 57,563 | 362,735 | 199,943
Gains on transaction of derivatives | 146,448 | 157,961 | 179,745
Gains on foreign currency translation of Finance Income | 1,005,961 | 175,839 | 143,254
Gains on foreign currency transaction | 24,009 | 21,774 | 27,051
Other financial assets | 1,470 | 0 | 0
Total Finance Income | ₩ 1,510,249 | ₩ 1,009,706 | ₩ 796,870

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