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Finance Income - Summary of Finance Income and Interest Income (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest Income      
Cash and cash equivalents ₩ 12,692 ₩ 9,419 ₩ 42,861
Financial assets at fair value through profit or loss 18,415 19,114 29,411
Financial assets at amortized cost 797 612 539
Loans 25,196 26,232 63,448
Short-term financial instruments 7,531 25,540 49,070
Long-term financial instruments 12,470 10,406 12,794
Other financial assets 230 228 54
Trade and other receivables 144,543 151,035 69,941
Total Interest Income 221,874 242,586 268,118
Dividend income 10,522 7,316 13,838
Gains on disposal of financial assets 7,718 11,992 3,866
Gains on valuation of financial assets at fair value through profit or loss 14,338 12,904 5,575
Gains on valuation of derivatives 860,011 57,563 362,735
Gains on transaction of derivatives 124,900 146,448 157,961
Gains on foreign currency translation 146,349 1,005,961 175,839
Gains on foreign currency transactions 15,618 24,009 21,774
Other financial income 1,284 1,470 0
Total Finance Income ₩ 1,402,614 ₩ 1,510,249 ₩ 1,009,706