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Classification of Financial Instruments - Classification of comprehensive income (loss) from financial instruments (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income, expense, gains or losses of financial instruments |  |  |
Interest income | ₩ 268,118 | ₩ 223,767 | ₩ 206,143
Dividends income | 13,838 | 12,777 | 11,477
Impairment of available-for-sale financial assets | 0 | 0 | (2,713)
Gain (loss) on valuation of derivatives | 317,350 | 153,203 | (874,667)
Gain (loss) on valuation of financial assets | 32,233 | 25,430 |
Interest expense of trade and other payables | (94,019) | (42,830) | (57,160)
Interest expense of others | (558,464) | (505,112) | (491,665)
Cash and Cash Equivalents |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 42,861 | 40,704 | 35,474
Financial assets available-for-sale |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Dividends income |  |  | 11,477
Impairment of available-for-sale financial assets |  |  | (2,713)
Gain (loss) on disposal of available-for-sale financial assets |  |  | (1,213)
Financial assets at fair value through profit or loss |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 29,411 | 21,713 | 290
Gain (loss) on valuation of derivatives | 151,604 | 34,117 | (214,100)
Gain (loss) on transaction of derivatives | 63,329 | 39,114 | (37,266)
Gain (loss) on valuation of financial assets | 1,062 | 1,879 | 12
Gain on disposal of financial assets | 1,760 | 1,837 |
Financial assets at fair value through other comprehensive income |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Dividends income | 13,838 | 12,777 |
Financial assets at amortized cost |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 539 | 89 |
Loans and receivables |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 63,448 | 21,925 | 30,014
Trade and other receivables |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 69,941 | 90,390 | 102,727
Held-to-maturity investments |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income |  |  | 82
Short-term financial instruments |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 49,070 | 41,025 | 29,412
Long-term financial instruments |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 12,794 | 7,920 | 8,144
Other financial assets |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 54 | 1 |
Derivative assets (applying hedge accounting) |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on valuation of derivatives | 123,730 | 69,799 | (41,129)
Gain (loss) on transaction of derivatives | 65,651 | 34,152 | (58,299)
Gain (loss) on valuation of derivatives (equity, before tax) | 38,305 | 8,600 | 2,453
Financial liabilities carried at amortized cost |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest expense of borrowings and debt securities | (1,394,328) | (1,320,516) | (1,240,727)
Interest expense of trade and other payables | (94,019) | (42,830) | (57,160)
Interest expense of others | (558,464) | (505,112) | (491,665)
Loss on retirement of financial liabilities |  |  | (5)
Gain (loss) on foreign currency transactions and translations | (406,175) | (356,159) | 1,075,215
Financial liabilities at fair value through profit or loss |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on valuation of derivatives | 27,686 | (4,650) | (179,879)
Gain (loss) on transaction of derivatives | (493) | 36,046 | (27,175)
Derivative liabilities (using hedge accounting) |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on valuation of derivatives | 14,330 | 53,937 | (439,559)
Gain (loss) on transaction of derivatives | (42,072) | 37,985 | (46,221)
Gain (loss) on valuation of derivatives (equity, before tax) | ₩ (2,578) | ₩ (15,029) | ₩ 29,431

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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_20_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of interest expense on other financial liabilities. [Refer: Interest expense; Other financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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