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Classification of Financial Instruments - Classification of comprehensive income (loss) from financial instruments (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income, expense, gains or losses of financial instruments |  |  |
Interest income | ₩ 242,586 | ₩ 268,118 | ₩ 223,767
Dividends income | 7,316 | 13,838 | 12,777
Gain (loss) on valuation of derivatives | (455,715) | 317,350 | 153,203
Gain (loss) on valuation of financial assets | 40,699 | 32,233 |
Interest expense of trade and other payables | 88,757 | 94,019 | 42,830
Interest expense of others | 540,867 | 558,464 | 505,112
Gain (loss) on repayment of financial liabilities | 1,314 | 916 | 10,303
Cash and Cash Equivalents |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 9,419 | 42,861 | 40,704
Financial assets at fair value through profit or loss |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 19,114 | 29,411 | 21,713
Gain (loss) on valuation of derivatives | (52,447) | 151,604 | 34,117
Gain (loss) on transaction of derivatives | 36,563 | 63,329 | 39,114
Gain (loss) on valuation of financial assets | 5,508 | 1,062 | 1,879
Gain on disposal of financial assets | 11,344 | 1,760 | 1,837
Financial assets at fair value through other comprehensive income |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Dividends income | 7,316 | 13,838 | 12,777
Financial assets at amortized cost |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 612 | 539 | 89
Loans and receivables |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 26,232 | 63,448 | 21,925
Trade and other receivables |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 151,035 | 69,941 | 90,390
Short-term financial instruments |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 25,540 | 49,070 | 41,025
Long-term financial instruments |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 10,406 | 12,794 | 7,920
Other financial assets |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 228 | 54 | 1
Derivative assets (applying hedge accounting) |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on valuation of derivatives | (77,733) | 123,730 | 69,799
Gain (loss) on transaction of derivatives | 36,053 | 65,651 | 34,152
Gain (loss) on valuation of derivatives (equity, before tax) | 9,925 | 38,305 | 8,600
Financial liabilities at fair value through profit or loss |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on valuation of derivatives | (104,607) | 27,686 | (4,650)
Gain (loss) on transaction of derivatives | (49,788) | (493) | 36,046
Financial liabilities carried at amortized cost |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest expense of borrowings and debt securities | 1,365,801 | 1,394,328 | 1,320,516
Interest expense of trade and other payables | 88,757 | 94,019 | 42,830
Interest expense of others | 540,867 | 558,464 | 505,112
Gain (loss) on repayment of financial liabilities | (35) |  |
Gain (loss) on foreign currency transactions and translations | 739,244 | (406,175) | (356,159)
Derivative liabilities (using hedge accounting) |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on valuation of derivatives | (220,928) | 14,330 | 53,937
Gain (loss) on transaction of derivatives | 42,565 | (42,072) | 37,985
Gain (loss) on valuation of derivatives (equity, before tax) | ₩ 101,295 | ₩ (2,578) | ₩ (15,029)

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- Definition The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_20_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of other comprehensive income, before tax, related to gains (losses) on hedging instruments that hedge investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income, before tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_91_b&doctype=Standard -URIDate 2020-01-01 + Details
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