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Income Taxes - Summary of Reconciliation Between Actual Income Tax Expense and Amount Computed by Applying the Statutory Tax Rate (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |  |  |
Profit (loss) before income tax |  | ₩ (7,085,214) |  | ₩ 2,991,533 | ₩ (3,265,838) |
Income tax expense (benefit) computed at applicable tax rate | [1] | (1,948,434) |  | 822,672 | (898,105) |
Adjustments |  | (60,668) |  | 140,148 | 72,243 |
Effect of applying gradual tax rate |  | (10,362) |  | (10,362) | 10,362 |
Effect of non-taxable income |  | (4,983) |  | (13,593) | (9,990) |
Effect of non-deductible expenses |  | 78,814 |  | 46,776 | 12,197 |
Effect of tax losses that are not recognized as deferred tax asset |  | 1,351 |  | 0 | 57,490 |
Effects of tax credits and deduction |  | (43,931) |  | (63,753) | (76,983) |
Effect of change in deferred tax due to change in tax rate |  | 18,931 |  | (17,590) | 16,848 |
Reversal of unrecognized deferred tax asset, net |  | (43,641) |  | (10,471) | (22,469) |
Deduction of deferred tax assets |  | 73,887 |  | 55,682 | 0 |
Deferred tax related to investments in subsidiaries, associates and joint ventures |  | (135,878) |  | 102,137 | 147,598 |
Others, net |  | 5,144 |  | 51,322 | (62,810) |
Adjustment in respect of prior years due to change in estimate |  | 153,113 |  | (63,756) | (176,441) |
Income tax expense (benefit) |  | ₩ (1,855,989) |  | ₩ 899,064 | ₩ (1,002,303) |
Effective tax rate |  |  | [2] | 30.05% |  | [2]
[1] | Applicable tax rate is 27.5% as of December 31, 2019, 2020 and 2021.
[2] | The effective tax rate for the year ended December 31, 2019 and 2021 is not calculated due to income tax benefit and the effective tax rate for the year ended December 31, 2020 is 30.05%.

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- Definition The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2021-01-01 -Paragraph 23 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_23_h&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2021-01-01 -Paragraph 35 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2021-en-r&anchor=para_35_b_viii&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 79 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_79&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 82 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_82_d&doctype=Standard -URIDate 2021-03-24 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2021-03-24 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph B13 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_g&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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