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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income, expense, gains or losses of financial instruments |  |  |  |
Dividends income |  | ₩ 25,941 | ₩ 28,875 | ₩ 10,522
Gain (loss) on valuation of derivatives |  | 234,199 | 224,218 | 822,994
Gain (loss) on transaction of derivatives |  | 89,659 | 224,685 | 84,082
Gain (loss) on valuation of derivatives (equity, before tax) | [1] | (8,518) | (65,052) | (40,460)
Interest expense of trade and other payables |  | 200,440 | 204,078 | 213,765
Interest expense of others |  | 614,332 | 472,248 | 384,423
Other finance income |  | 4,970 | 925 | 1,284
Other finance expenses |  | 2,513 | 25,144 | 4,058
Cash and cash equivalents |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Interest income |  | 100,205 | 51,872 | 12,692
Gain (loss) on foreign currency transactions and translations |  | (2,073) | 22,158 | 34,923
Financial assets at amortized cost |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Interest income |  | 2,929 | 1,308 | 797
Gain (loss) on foreign currency transactions and translations |  | (1,774) | 5,087 | (3,647)
Financial assets at fair value through other comprehensive income |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Dividends income |  | 21,748 | 26,881 | 7,573
Financial assets at fair value through profit or loss |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Interest income |  | 65,470 | 58,540 | 18,415
Dividends income |  | 4,193 | 1,994 | 2,949
Gain (loss) on valuation of derivatives |  | 144,797 | 336,049 | 450,896
Gain (loss) on transaction of derivatives |  | 130,230 | 205,298 | 54,352
Gain (loss) on valuation of financial assets |  | 128,307 | (37,230) | 8,858
Gain (loss) on disposal of financial assets |  | 13,161 | 9,358 | 4,221
Loans and receivables |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Interest income |  | 44,029 | 33,545 | 25,196
Gain (loss) on foreign currency transactions and translations |  | 127 | 596 | 729
Trade and other receivables |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Interest income |  | 168,303 | 164,653 | 144,543
Gain (loss) on disposal of financial assets |  | 0 | 0 | 2,452
Gain (loss) on foreign currency transactions and translations |  | 27,363 | 1,019 | 14,207
Short-term financial instruments |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Interest income |  | 34,260 | 15,827 | 7,531
Gain (loss) on foreign currency transactions and translations |  | 0 | 3,513 | 32,218
Long-term financial instruments |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Interest income |  | 14,183 | 14,371 | 12,470
Gain (loss) on foreign currency transactions and translations |  | 0 | 1 | 27
Other financial assets |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Interest income |  | 241 | 637 | 230
Derivative (applying hedge accounting) |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Gain (loss) on valuation of derivatives |  | 76,814 | 149,888 | 211,180
Gain (loss) on transaction of derivatives |  | 19,604 | 54,422 | 31,351
Gain (loss) on valuation of derivatives (equity, before tax) |  | (10,539) | (93,699) | (11,734)
Financial liabilities at fair value through profit or loss |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Gain (loss) on valuation of derivatives |  | 961 | (345,313) | 2,751
Gain (loss) on transaction of derivatives |  | (80,640) | (110,236) | (15,358)
Financial liabilities carried at amortized cost |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Gain (loss) on repayment of financial liabilities |  | 0 | (15) | (10)
Gain (loss) on foreign currency transactions and translations |  | (420,203) | (936,269) | (1,162,835)
Interest expense of borrowings and debt securities |  | 3,636,887 | 2,142,220 | 1,316,269
Interest expense of trade and other payables |  | 200,440 | 204,078 | 213,765
Interest expense of others |  | 614,332 | 472,248 | 384,423
Other finance income |  | 4,971 | 927 | 1,284
Other finance expenses |  | 1,796 | 167 | 2,504
Derivatives (applying hedge accounting) |  |  |  |
Income, expense, gains or losses of financial instruments |  |  |  |
Gain (loss) on valuation of derivatives |  | 11,627 | 83,594 | 158,167
Gain (loss) on transaction of derivatives |  | 20,465 | 75,201 | 13,737
Gain (loss) on valuation of derivatives (equity, before tax) |  | ₩ 2,021 | ₩ 28,647 | ₩ (28,726)
[1] | For the years ended December 31, 2021, 2022 and 2023, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦15,778 million, ￦24,415 million and ￦3,654 million, net of tax, are included in other comprehensive loss, respectively.

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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 2023-01-01 -Paragraph 11 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRIC&num=19&code=ifrs-tx-2023-en-r&anchor=para_11&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_85&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 52 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2023-en-r&anchor=para_52_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_35&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_b&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_7&doctype=Standard -URIDate 2023-03-23 + Details
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