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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |  |  |
Profit (loss) before income tax (previously stated) |  | ₩ (33,843,619) |  | ₩ (7,071,570) |  | ₩ 2,991,533
Income tax expense (benefit) computed at applicable tax rate | [1] | (9,306,995) |  | (1,944,682) |  | 822,672
Adjustments |  | (155,890) |  | (64,420) |  | 140,148
Effect of applying gradual tax rate |  | (10,362) |  | (10,362) |  | (10,362)
Effect of non-taxable income |  | (9,471) |  | (4,983) |  | (13,593)
Effect of non-deductible expenses |  | 39,663 |  | 78,814 |  | 46,776
Effect of tax losses that are not recognized as deferred tax asset |  | 19,275 |  | 1,351 |  | 0
Effects of tax credits and deduction |  | (98,684) |  | (43,931) |  | (63,753)
Reversal of unrecognized deferred tax asset, net |  | (38,708) |  | (43,641) |  | (10,471)
Effect of change in deferred tax due to change in tax rate |  | 393,416 |  | 18,931 |  | (17,590)
Deduction of deferred tax assets |  | (85,514) |  | 73,887 |  | 55,682
Deferred tax related to investments in subsidiaries, associates and joint ventures |  | (375,064) |  | (135,878) |  | 102,137
Others, net |  | 9,559 |  | 1,392 |  | 51,322
Adjustment in respect of prior years due to change in estimate |  | 48,374 |  | 153,113 |  | (63,756)
Income tax expense (benefit) |  | ₩ (9,414,511) |  | ₩ (1,855,989) |  | ₩ 899,064
Effective tax rate |  |  | [2] |  | [2] | 30.05%
[1] | Applicable tax rate is 27.5% as of December 31, 2020, 2021 and 2022.
[2] | The effective tax rate for the year ended December 31, 2020 is 30.05 % and the effective tax rate for the years ended December 31, 2021 and 2022 is not calculated due to income tax benefit.

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