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