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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income, expense, gains or losses of financial instruments |  |  |
Dividends income | ₩ 10,522 | ₩ 7,316 | ₩ 13,838
Gain (loss) on valuation of derivatives | 822,994 | (455,715) | 317,350
Gain (loss) on valuation of financial assets | 34,444 | 40,699 |
Interest expense of trade and other payables | 213,765 | 88,757 | 94,019
Interest expense of others | 384,423 | 540,867 | 558,464
Other finance income | 1,284 | 1,470 | 0
Other finance expenses | 4,058 | 4,456 | 2,555
Cash and Cash Equivalents |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 12,692 | 9,419 | 42,861
Gain (loss) on foreign currency transactions and translations | 34,923 | (15,911) | (3,332)
Financial assets at fair value through profit or loss |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 18,415 | 19,114 | 29,411
Dividends income | 2,949 | 4,734 | 6,984
Gain (loss) on valuation of derivatives | 450,896 | (52,447) | 151,604
Gain (loss) on transaction of derivatives | 54,352 | 36,563 | 63,329
Gain (loss) on valuation of financial assets | 8,858 | 5,508 | 1,062
Gain on disposal of financial assets | 4,221 | 11,344 | 1,760
Financial assets at fair value through other comprehensive income |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Dividends income | 7,573 | 2,582 | 6,854
Financial assets at amortized cost |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 797 | 612 | 539
Gain (loss) on foreign currency transactions and translations | (3,647) | (1,733) | (690)
Loans and receivables |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 25,196 | 26,232 | 63,448
Gain (loss) on foreign currency transactions and translations | 729 | (527) | (631)
Trade and other receivables |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 144,543 | 151,035 | 69,941
Gain on disposal of financial assets | 2,452 |  |
Gain (loss) on foreign currency transactions and translations | 14,207 | 23,458 | (31,500)
Short-term financial instruments |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 7,531 | 25,540 | 49,070
Gain (loss) on foreign currency transactions and translations | 32,218 | (38,088) | 39,845
Long-term financial instruments |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 12,470 | 10,406 | 12,794
Gain (loss) on foreign currency transactions and translations | 27 | 0 | 0
Other financial assets |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Interest income | 230 | 228 | 54
Derivative (applying hedge accounting) |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on valuation of derivatives | 211,180 | (77,733) | 123,730
Gain (loss) on transaction of derivatives | 31,351 | 36,053 | 65,651
Gain (loss) on valuation of derivatives (equity, before tax) | (11,734) | 9,925 | 38,305
Financial liabilities at fair value through profit or loss |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on valuation of derivatives | 2,751 | (104,607) | 27,686
Gain (loss) on transaction of derivatives | (15,358) | (49,788) | (493)
Financial liabilities carried at amortized cost |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on repayment of financial liabilities | (10) | (35) | 0
Gain (loss) on foreign currency transactions and translations | (1,162,835) | 772,045 | (409,867)
Interest expense of borrowings and debt securities | 1,316,269 | 1,365,801 | 1,394,328
Interest expense of trade and other payables | 213,765 | 88,757 | 94,019
Interest expense of others | 384,423 | 540,867 | 558,464
Other finance income | 1,284 | 0 | 0
Other finance expenses | 2,504 | 0 | 0
Derivatives (applying hedge accounting) |  |  |
Income, expense, gains or losses of financial instruments |  |  |
Gain (loss) on valuation of derivatives | 158,167 | (220,928) | 14,330
Gain (loss) on transaction of derivatives | 13,737 | 42,565 | (42,072)
Gain (loss) on valuation of derivatives (equity, before tax) | ₩ (28,726) | ₩ 101,295 | ₩ (2,578)

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- Definition The gain (loss) arising from the difference between the carrying amount of the financial liability extinguished and the measurement of the consideration paid (equity instruments issued) to the creditor. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRIC -Number 19 -IssueDate 2021-01-01 -Paragraph 11 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRIC&num=19&code=ifrs-tx-2021-en-r&anchor=para_11&doctype=Standard -URIDate 2021-03-24 + Details
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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 2021-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2021-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2021-en-r&anchor=para_52_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_35&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20_a_i&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_7&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_91_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of finance income that the entity does not separately disclose in the same statement or note. [Refer: Finance income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of trading income (expense) relating to derivative financial instruments. [Refer: Derivatives [member]; Trading income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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