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Income Taxes - Summary of Reconciliation Between Actual Income Tax Benefit and Amount Computed by Applying the Statutory Tax Rate (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Loss before income tax |  | ₩ (7,553,977) | ₩ (33,843,619) | ₩ (7,071,570)
Income tax benefit computed at applicable tax rate | [1] | (1,936,840) | (9,306,995) | (1,944,682)
Effect of applying gradual tax rate |  | (10,362) | (10,362) | (10,362)
Effect of non-taxable income |  | (26,993) | (9,471) | (4,983)
Effect of non-deductible expenses |  | 39,411 | 39,663 | 78,814
Recognition Of Unrecognized Deferred Tax Asset Net |  | 0 | 19,275 | 1,351
Effects of tax credits and deduction |  | (53,724) | (98,684) | (43,931)
Reversal of unrecognized deferred tax asset, net |  | (15,244) | (38,708) | (43,641)
Effect of change in deferred tax due to change in tax rate |  | 211,736 | 393,416 | 18,931
Deduction of deferred tax assets |  | 29,095 | (85,514) | 73,887
Deferred tax related to investments in subsidiaries, associates and joint ventures |  | (1,063,007) | (375,064) | (135,878)
Others, net |  | 20,195 | 9,559 | 1,392
Adjustments |  | (868,893) | (155,890) | (64,420)
Adjustment in respect of prior years due to change in estimate |  | (32,100) | 48,374 | 153,113
Income tax benefit |  | ₩ (2,837,833) | ₩ (9,414,511) | ₩ (1,855,989)
Effective tax rate | [2] |  |  |
[1] | Applicable tax rates are 27.5%, 26.5% and 25.64% as of December 31, 2021, 2022 and 2023, respectively.
[2] | The effective tax rate for the year ended December 31, 2021, 2022 and 2023 is not calculated due to income tax benefit.

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